![](media/image1.png){width="1.9583333333333333in" height="0.8125in"}

Planetary and Space Sciences Research Institute (PSSRI)

+-----------------------------------------------------------------------+
| **Huygens-SSP**                                                       |
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| Experimenter to Archive Interface Control Document                    |
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| PY-SSP-OU-PR-100-00                                                   |
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| Draft 1                                                               |
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| 15-May-2003                                                           |
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\_\_\_\_\_(***Still To be Reviewed Internally)***\_\_\_\_

**Prepared by: Instrument Archive Responsible**

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

**Approved by: Principal Investigator**

**Table Of Contents**

Distribution List [4](#distribution-list)

Change Log [5](#change-log)

Open Issues [6](#open-issues)

Acronyms and Abbreviations [7](#acronyms-and-abbreviations)

Introduction [7](#introduction)

Purpose and Scope [7](#purpose-and-scope)

Contents [7](#contents)

Intended Readership [8](#intended-readership)

Applicable Documents [8](#applicable-documents)

Relationships to Other Interfaces
[8](#relationships-to-other-interfaces)

Contact Names and Addresses [8](#contact-names-and-addresses)

Overview of Process and Product Generation
[8](#overview-of-process-and-product-generation)

Measurements Summary [9](#measurements-summary)

Experiment Overview [9](#experiment-overview)

Subsystem Overview [10](#subsystem-overview)

Accelerometer External (ACC-E) [10](#accelerometer-external-acc-e)

Accelerometer Internal (ACC-I) [11](#accelerometer-internal-acc-i)

Acoustic Properties Instrument -- Sonar (API-S)
[11](#acoustic-properties-instrument-sonar-api-s)

Acoustic Properties Instrument -- Velocity sensor (API-V)
[11](#acoustic-properties-instrument-velocity-sensor-api-v)

Density Sensor (DEN) [12](#density-sensor-den)

Permittivity Sensor (PER) [12](#permittivity-sensor-per)

Refractive Index Sensor (REF) [12](#refractive-index-sensor-ref)

Thermal Properties Sensor (THP) [13](#thermal-properties-sensor-thp)

Tiltmeter (TIL) [13](#tiltmeter-til)

Definition of SSP Operating Modes
[13](#definition-of-ssp-operating-modes)

Archive Format and Content [14](#archive-format-and-content)

Format and Conventions [14](#format-and-conventions)

Deliveries and Archive Volume Format
[14](#deliveries-and-archive-volume-format)

Data Set ID Formation [14](#data-set-id-formation)

Data Directory Naming Convention [14](#data-directory-naming-convention)

File naming Convention [14](#file-naming-convention)

Standards Used in Data Product Generation
[15](#standards-used-in-data-product-generation)

PDS Standards [15](#pds-standards)

Time Standards [15](#time-standards)

Reference Systems [15](#reference-systems)

Other Applicable Standards [15](#other-applicable-standards)

Data Validation [15](#data-validation)

Content [16](#content)

Volume Set [16](#volume-set)

Data Set [16](#data-set)

Directories [18](#directories)

Software [20](#software)

Documentation [20](#documentation)

Derived and other Data Products [20](#derived-and-other-data-products)

Detailed Interface Specifications
[21](#detailed-interface-specifications)

Sample Labels [21](#sample-labels)

ACCE - Data Label 1 (see 'ACCE_MODE5_TABLE' data product, page )
[21](#acce---data-label-1-see-acce_mode5_table-data-product-page-37)

ACCE - Data Label 2 (see 'ACCE_MODE123_DN_SERIES' data product, page = )
[22](#acce---data-label-2-see-acce_mode123_dn_series-data-product-page-38)

ACCI - Data Label 1 (see 'ACCI_MODE5_TABLE' data product, page = )
[23](#acci---data-label-1-see-acci_mode5_table-data-product-page-39)

ACCI - Data Label 2 (see 'ACCI_MODE1236_TABLE' data product, page = )
[24](#acci---data-label-2-see-acci_mode1236_table-data-product-page-40)

APIS - Data Label 1 (see 'APIS_MODE23_TABLE' data product, page = )
[25](#apis---data-label-1-see-apis_mode23_table-data-product-page-42)

APIS - Data Label 2 (see 'APIS_MODE4_TABLE' data product, page = )
[26](#apis---data-label-2-see-apis_mode4_table-data-product-page-43)

APIS - Data Label 3 (see 'APIS_MODE6_TABLE' data product, page = )
[27](#apis---data-label-3-see-apis_mode6_table-data-product-page-44)

APIV - Data Label (see 'APIV_MODE123456_TABLE' data product, page = )
[28](#apiv---data-label-see-apiv_mode123456_table-data-product-page-45)

DEN Data Label (see 'DEN_MODE123456_TABLE' data product, page = )
[29](#den-data-label-see-den_mode123456_table-data-product-page-46)

PER Data Label
[30](#per-data-label-see-per_mode123456_table-data-product-pages-52-to-54)

REF - Data Label
[31](#ref---data-label-see-ref_mode123456_table-data-product-pages)

THP -- Data Label
[32](#thp-data-label-see-thp_mode123456_table-data-product-page)

TIL Data Label
[33](#til-data-label-see-til_mode123456_table-data-product-page)

HK - Data Label 1 [34](#hk---data-label-1)

HK - Data Label 2 [35](#hk---data-label-2)

Data Product Design - ACCE Sensor
[37](#data-product-design---acce-sensor)

Data Product Design - ACCI Sensor
[39](#data-product-design---acci-sensor)

Data Product Design - APIS Sensor
[42](#data-product-design---apis-sensor)

Data Product Design - APIV Sensor
[45](#data-product-design---apiv-sensor)

Data Product Design of DEN Sensor
[46](#data-product-design-of-den-sensor)

Data Product Design of TIL Sensor
[47](#data-product-design-of-til-sensor)

Data Product Design of PER Sensor
[52](#data-product-design-of-per-sensor)

Data Product Design of REF Sensor
[55](#data-product-design-of-ref-sensor)

Data Product Design of THP Sensor
[59](#data-product-design-of-thp-sensor)

Appendix 1: Available Software to read PDS files
[64](#appendix-1-available-software-to-read-pds-files)

Appendix 2: Auxiliary Data Usage [64](#appendix-2-auxiliary-data-usage)

Appendix 3: Example of Directory Listing of Data Set X
[64](#appendix-3-example-of-directory-listing-of-data-set-x)

# Distribution List

(TBD)

  -------------------- ------------------------------- ------------------
  **Recipient**        **Organisation**                **Recipient**

                                                       

                                                       

                                                       

                                                       

                                                       

                                                       

                                                       

                                                       

                                                       

                                                       

                                                       

                                                       

                                                       
  -------------------- ------------------------------- ------------------

# Change Log

  -------------------- ------------------------------- ------------------
  **Date**             **Sections Changed**            **Reasons for
                                                       Change**

                                                       

                                                       

                                                       

                                                       

                                                       

                                                       

                                                       

                                                       

                                                       

                                                       

                                                       

                                                       

                                                       
  -------------------- ------------------------------- ------------------

# Open Issues

  -----------------------------------------------------------------------
  **Section**               **Description**
  ------------------------- ---------------------------------------------
                            Are there any other requirements on the SSP
                            archive from other working groups, e.g. the
                            DTWG (Descent Trajectory Working Group)

                            Do we need keywords that describe the
                            position of the sensors during the descent?
                            What will these keywords be? Can we assume
                            that the reference frame used is the one
                            proposed by the DTWG and be used by all other
                            instruments too?

                            Do all instruments use the same mode
                            definition? Mode 1, 2, 3 are the same for all
                            instruments, but which other instrument team
                            is using a mode on top of this, e.g. Mode
                            4,5,6 ?

                            

                            

                            

                            

                            

                            

                            

                            

                            

                            

                            

                            

                            

                            

                            

                            

                            

                            
  -----------------------------------------------------------------------

# Acronyms and Abbreviations

EAICD - Experimenter to (Science) Archive Interface Control Document

SSP -- Surface Science Package

ACCI -- Accelerometer (Internal) sub-system

ACCE -- Accelerometer / Force Transducer (External) sub-system

APIS -- Acoustic sounder sub-system

APIV -- Acoustic velocity sub-system

DEN -- Density sub-system

PER -- Relative permittivity and conductivity sub-system

REF -- Refractive index sub-system

THP -- Thermal properties sub-system

TIL -- 2 axis tilt angle measuring sub-system

HK -- Housekeeping data

PDS -- Planetary Data System

PSA -- Planetary Science Archive

TBW -- to be written

DDID -- ESOC's Data Delivery Interface Document

ESOC -- European Space Operations Centre

DN -- A/D converters output in 'counts' (PDS term = Digital Number)

DL -- PDS term 'Detached Label'

# Introduction

## Purpose and Scope

> The primary objective of this EAICD document is to provide the readers
> of this document, a detailed explanation of the SSP data available at
> the archive. The intention is to define all SSP data products
> accurately. The secondary objective of this document is to provide a
> formal interface for communication between SSP PI and the archiving
> authority.
>
> The methods used for interpreting SSP data any further than given in
> the archive or a detailed description of the SSP experiment is beyond
> the scope of this document. Please refer to reference section for some
> further details.

## Contents

> This document describes the SSP data as presented to the PDS data
> archive. It includes information on how the data is processed,
> formatted, labeled, and uniquely identified. The document discusses
> general naming schemes for data volumes, data sets, data, and label
> files. Standards used to generate the product are explained.
>
> The design of the data set structure and the data product is given.
> Examples of these are given in the appendix.

## Intended Readership

> The staff of archiving authority (Planetary Data System for NASA,
> Planetary Science Archive for ESA) design team and any potential user
> of the SSP final archive.

## Applicable Documents

> \[1\] Planetary Data System Preparation Workbook, February 1, 1995,
> Version 3.1, JPL, D-7669, Part 1
>
> \[2\] Planetary Data System Standards Reference, October 30, 2002,
> Version 3.5, JPL, D-7669, Part 2
>
> \[3\] PY-SSP-RAL-xxxx, Huygens Surface Science Package, On-board
> Software Users Guide, Issue 1, 22 October 1997
>
> \[4\] HY-ESC-IF-XXXX, Huygens DDID, Detailed Data Interface Document,
> XX XXX 19XX
>
> \[5\] PY-SSP-UKC-EID-001, SSP-EID-B, Experiment Interface Control
> Document, 23 February 1995

## Relationships to Other Interfaces

\[state what products, software and documents would be affected by a
change in this EAICD. Refer to any other documents that describe the
interfaces.\]. ?? TBD (or N/A)

## Contact Names and Addresses

> Brijen Hathi, Open University, <b.hathi@open.ac.uk>, phone: +44
> (0)1908 659593
>
> Mark Leese, Open University, <m.r.leese@open.ac.uk>, phone: +44
> (0)1908 652561
>
> John Zarnecki, Open University, <j.zarnecki@open.ac.uk>, phone: +44
> (0)1908 659599

# Overview of Process and Product Generation

> \[list here the involved teams, physical locations, names with
> responsibilities, who are involved to process the data.
>
> Indicate data levels as defined in the archive plan.
>
> Indicate software that is used to process the data
>
> Include in this overview any or all of the following sections
> (avoiding redundancy with parts of section 3)
>
> (TBD -- after agreement between SSP team and data archiving team)

## Measurements Summary

Table 1 (below) summarises the measurements made by the SSP experiment.

+----------+----------------------------+------------------------------+
| **       | **Measured parameters**    | **Derived parameters**       |
| sensor** |                            |                              |
+----------+----------------------------+------------------------------+
| ACC-E    | Impact force               | Impact force                 |
+----------+----------------------------+------------------------------+
| ACC-I    | Acceleration               | Acceleration                 |
+----------+----------------------------+------------------------------+
| API-V    | Time delay in milli        | Speed of sound and           |
|          | seconds                    |                              |
|          |                            | Mean molecular mass          |
+----------+----------------------------+------------------------------+
| API-S    | Acoustic excitation        | Sounding information         |
+----------+----------------------------+------------------------------+
| DEN      | Strain (of buoyancy float) | Density                      |
+----------+----------------------------+------------------------------+
| PER      | Capacitance                | Permittivity and             |
|          |                            | conductivity                 |
+----------+----------------------------+------------------------------+
| REF      | Light intensities          | Refractive index             |
+----------+----------------------------+------------------------------+
| THP      | Resistance                 | Temperature and thermal      |
|          |                            | conductivity                 |
+----------+----------------------------+------------------------------+
| TIL      | 2-axis tilt angles         | Tilt angles                  |
+----------+----------------------------+------------------------------+
| HK       | Temperatures, and other    | Temperatures, and other      |
|          | engineering information    | engineering information      |
+----------+----------------------------+------------------------------+
| STATUS   | Experiment and mission     | Experiment and mission       |
|          | status summary             | status summary               |
+----------+----------------------------+------------------------------+

**Table 1: SSP experiment -- measured and derived parameters summary**

## Experiment Overview

The SSP experiment consists of nine separate sensors that are designed
to measure a wide range of physical properties of Titan's lower
atmosphere, surface, and sub-surface. By measuring a number of physical
properties of the surface it is expected that the SSP will be able to
constrain the inferred composition and structure of the moon's
near-surface environment. Although the SSP is primarily designed to
sense properties of the surface, some of its sensors will also make
measurements of the atmosphere along the probe's entry path and will
complement the data gathered by other experiments on the Huygens probe.

Please refer to the publication list for further details.

![](media/image3.png){width="6.333333333333333in"
height="3.5416666666666665in"}

## Subsystem Overview

### Accelerometer External (ACC-E) 

![](media/image4.png){width="1.7715277777777778in"
height="2.3916666666666666in"}The accelerometer subsystem is designed to
characterise the immediate surface of the landing site by recording the
dynamic response of two devices mounted in different positions on the
probe. The sensor is designed to sense the force exerted on a pylon that
protrudes from the foredome aperture. The force is sensed by a
piezoelectric ceramic element that is mounted between a hemispherical
titanium alloy head and the pylon shaft. If Huygens lands on a
relatively uniform surface the ACC-E penetrometer will be smoothly
driven into the surface material until the probe's fore-dome strikes the
surface, bringing it to a halt. During the impact process the ACC-E is
sampled at a rate of 10 kHz, giving it an effective depth resolution of
1 mm for a nominal mission impact speed of 5 m s^-1^.

### Accelerometer Internal (ACC-I)

![](media/image5.png){width="2.9652777777777777in"
height="1.8881944444444445in"}The ACC-I sensor provides information
about the vertical non-static accelerations experienced by the entire
probe. The primary role of ACC-I is to determine the probe impact (this
gives the landing time as well as a measure of local surface compressive
properties). The sensor is operational throughout the mission, measuring
changes in acceleration during descent phase and returning an impact
trace of about 1 second duration after the impact sampled at 500 Hz.

### Acoustic Properties Instrument -- Sonar (API-S)

![](media/image6.png){width="2.1666666666666665in"
height="1.4854166666666666in"}

The API-S sensor will measure the effective acoustic cross-section of
the medium within its field of view at a wavelength of around 13 mm.
Each echo is sampled at a rate of 1kHz, and during the final section of
the probe's descent this sensor may be able to provide information about
the topography of the landing site.

### Acoustic Properties Instrument -- Velocity sensor (API-V)

![](media/image7.png){width="2.7493055555555554in"
height="1.3465277777777778in"}The API-V consists of a pair of
piezoelectric transducers mounted at the front surface of the Top Hat on
either side of the cavity. These sensors measure the speed of sound by
transmitting, and subsequently receiving, a brief 1 MHz acoustic signal.
The time interval between transmission and reception is measured with a
precision of 250 nanoseconds and the separation of 0.125 m gives a speed
resolution of 8 cm s^-1^ when operating in gas at Titan's surface.

### Density Sensor (DEN)

![](media/image8.png){width="2.423611111111111in"
height="1.5777777777777777in"}

The Density sensor is designed to measure the deflection of the float
(in terms of changes in the strain gauge response) in the case of a
liquid landing. Also during the descent, any condensation on the float
may be detectable. Therefore the sensor operates throughout the mission.

### Permittivity Sensor (PER)

![](media/image9.png){width="2.3666666666666667in" height="1.65625in"}In
the event of a liquid landing the SSP will also be able to determine a
number of electrical properties of the fluid. The PER device consists of
22 stacked parallel plates, the capacitance of which is measured at a
number of different frequencies. By briefly pulsing the sensor with DC
voltages the conductivity of the surrounding liquid may also be
ascertained

### Refractive Index Sensor (REF)

The REF sensor measures the refractive index of a liquid by using a
linear critical angle method. A fraction of light reflected/refracted
onto the photodiode array is used to derive the refractive index. This
sensor is capable of measuring refractive index in the range 1.250 to
1.450 .

### Thermal Properties Sensor (THP)

The THP sensor is designed to measure Thermal conductivity and
diffusivity of both liquid and gaseous media. Sensor consists of two
separate sets of redundant hot wire sensors enclosed in cylindrical
canisters. The thermal conductivity is derived from heat loss
measurements by studying the rate of loss from a known heat input.

### Tiltmeter (TIL)

![](media/image14.png){width="3.5555555555555554in" height="1.9in"}

The TIL sensor measures angles in 2 axes as shown in the figure. The
sensor operates throughout the mission. Angle measurements are made from
the fluid displacement in each of the 'orthogonal inclinometers' cells.

## Definition of SSP Operating Modes

The SSP operating modes are defined as follows:

M0: Checkout / Diagnostic mode -- not used during the real descent

M1: upper atmosphere mode

M2: mid atmosphere mode

M3: lower atmosphere mode

M4: proximity mode

M5: surface mode

M6: extended surface mode

M7: Checkout / Diagnostic mode -- not used during the real descent

# Archive Format and Content

## Format and Conventions

### Deliveries and Archive Volume Format 

> The individual logical archive volumes delivered are likely to contain

-   the data from ALL sensors

-   the raw data, calibrated data and the calibration data and software

> The logical archive volumes should contain one data set per volume.
> Potentially, three logical archive volumes are identified:

-   Descent data

-   In -Flight (cruise) checkout data

-   Selected laboratory data

> The SSP sensor housekeeping data and the SSP status data is likely to
> be archived in a similar way to other sensor data within the
> appropriate data sets.

### Data Set ID Formation

> The following 3 data sets are provisionally foreseen:

-   HP-STI-SSP-3/4-DESCENT-V1.0

-   HP-CRU-SSP-3/4-FLIGHT-CHECK-OUTS-V1.0

-   HP-CAL-SSP-3-LABORATORY-V1.0

### Data Directory Naming Convention

> For all data sets the following directory naming scheme will be used:

/data/{type}/{dpl}/{sensor}/filename, with

-   type = {FLIGHT_CHECK_OUT_n, DESCENT, LABORATORY}, with n=1..12

-   dpl = {RAW, CALIBRATED}, with dpl standing for data processing level

-   sensor = {ACCI, ACCE, APIS, APIV, DEN, PER, REF, THP, TIL, HK,
    STATUS}

> The calibration data will be archived in the **calib** directory below
> the root directory, as

-   /calib/{sensor}/filename

### File naming Convention 

> The following file naming scheme will be used for all data sets:
>
> HP_SSP\_{sensor}\_{mode}\_{data processing level}\_{spec}, with

-   sensor = {ACCI, ACCE, APIS, APIV, DEN, PER, REF, THP, TIL, HK,
    STATUS}

-   mode = {M0, M1, M2, M3, M4, M5, M6, M7, M123, M1236, M12356}, these
    modes represent the SSP mode as defined in \[3\]. If the data from
    different modes is grouped in the same table, then this is indicated
    by multiple numbers after 'M' - e.g. a data set representing modes 1
    to 6 (i.e. entire mission) is represented by M123456. Similarly
    M123, represents data from SSP atmosphere modes 1, 2 and 3.

-   data processing level = {R, C}, for raw and calibrated data
    respectively

-   spec = {ATMOS, PROX, SURF, EXTD, IMPACT, METHAN, ETHAN, ....}, the
    specs give additional information on the mission phase or the
    laboratory conditions.

## Standards Used in Data Product Generation

###  PDS Standards

PDS Standard version 3 was used for the design of the SSP archive.

### Time Standards

> The timing information used in all SSP data is derived from the
> Huygens Probe clock. This clock starts at zero (defined by Probe's
> entry into Titan's atmosphere) and has resolution of 2 milliseconds.
> The format used to represent SSP time is a REAL number consisting of
> seconds (integer part) and milliseconds (fractional part of the
> number) . Examples of the time format are given by the parameters:
> SC_CLOCK_START_TIME and SC_CLOCK_STOP_TIME.
>
> These timer values will be processed in addition to UTC times, as
> specified in the DDID, see \[4\] TBC.

### Reference Systems

TBD by the DTWG

### Other Applicable Standards

No other applicable standards are used.

## Data Validation

TBW -- by the DAWG?

## Content

### Volume Set

> SSP team will aim to deliver three logical archive volumes. Each of
> these volumes will contain one data set only. The **volumes names**
> and **volume ids** are the following (TBC):

  ------------------------------ -------------------- ---------------------------------------
  **Volume Name**                **Volume ID**        **Data Set ID**

  HUYGENS PROBE DESCENT SSP DATA UK_ESA_PSA_HP_1001   HP-STI-SSP-3/4-DESCEND-V1.0
  RECORD                                              

  HUYGENS PROBE FLIGHT CHECK     UK_ESA_PSA_HP_1002   HP-CRU-SSP-3/4-FLIGHT-CHECK-OUTS-V1.0
  OUTS SSP DATA RECORD                                

  HUYGENS PROBE LABORATORY SSP   UK_ESA_PSA_HP_1003   HP-CAL-SSP-3-LABORATORY-V1.0
  DATA RECORD                                         
  ------------------------------ -------------------- ---------------------------------------

> **Table 2: Proposed SSP Data (or 'logical archive volumes') for PDS
> archive**

### Data Set

Table 3 gives the definition of the **data set name** and **data set
id**:

  --------------------------------------- -----------------------------------
  **Data Set ID**                         **Data Set Name**

  HP-STI-SSP-3/4-DESCENT-V1.0             HUYGENS DESCENT RAW AND CALIBRATED
                                          DATA V1.0

  HP-CRU-SSP-3/4-FLIGHT-CHECK-OUTS-V1.0   HUYGENS FLIGHT CHECK OUTS RAW AND
                                          CALIBRATED DATA V1.0

  HP-CAL-SSP-3-LABORATORY-V1.0            HUYGENS LABORATORY RAW DATA V1.0
  --------------------------------------- -----------------------------------

**Table 3: SSP Data sets description**

> Table 4 describes the data types used for the raw data, data
> processing level 3 in the PDS standard. The raw data will contain the
> DN of the A/D converters from the individual sensors and for some of
> these DN, the data sets will contain the corresponding voltages in
> addition. DL is used to identify Detached Label. N X 2 stands for a
> table with n rows and two columns, (512) indicated the length of an
> array. N ususally represents the column in a table filled with time
> tags.
>
> The IMPACT packets will not be part of the raw and calibrated archive
> and will be separately handled TBD.

+------+----------------+--------+-------------------+----------------+
| **   | **HP-STI-SSP   |        | **                | **HP-CAL-SSP-  |
| Sens | -3/4-DESCENT** |        | HP-CRU-SSP-3/4-FL | 3-LABORATORY** |
| or** |                |        | IGHT-CHECK-OUTS** |                |
+------+----------------+--------+-------------------+----------------+
| A    | DL +           | 5      | Same as           | TBD            |
| CC-E | table(colu     | (i     |                   |                |
|      | mn,timeseries) | mpact) | 'HP-STI           |                |
|      |                |        | -SSP-3/4-DESCENT' |                |
+------+----------------+--------+-------------------+----------------+
|      | DL +           | 1,2,3  |                   |                |
|      | table(colu     | (sti   |                   |                |
|      | mn,timeseries) | mulus) |                   |                |
+------+----------------+--------+-------------------+----------------+
| A    | DL+ table      | 5      | Same as           | TBD            |
| CC-I |                |        |                   |                |
|      |                |        | 'HP-STI           |                |
|      |                |        | -SSP-3/4-DESCENT' |                |
+------+----------------+--------+-------------------+----------------+
|      | DL + table     | 1,2    |                   |                |
|      | +hktable       | ,3,5,6 |                   |                |
+------+----------------+--------+-------------------+----------------+
| A    | DL + table ( n |        | Same as           | TBD            |
| PI-V | x 3 ) (all     |        |                   |                |
|      | modes)         |        | 'HP-STI           |                |
|      |                |        | -SSP-3/4-DESCENT' |                |
+------+----------------+--------+-------------------+----------------+
| A    | DL + table +   |        | Same as           | TBD            |
| PI-S | array (mode    |        |                   |                |
|      | 2,3)           |        | 'HP-STI           |                |
|      |                |        | -SSP-3/4-DESCENT' |                |
|      | DL + table +   |        |                   |                |
|      | array (mode    |        |                   |                |
|      | 4,5)           |        |                   |                |
|      |                |        |                   |                |
|      | DL + table +   |        |                   |                |
|      | array (mode 6) |        |                   |                |
+------+----------------+--------+-------------------+----------------+
| DEN  | DL + table +   |        | Same as           | TBD            |
|      | array (all     |        |                   |                |
|      | modes)         |        | 'HP-STI           |                |
|      |                |        | -SSP-3/4-DESCENT' |                |
|      | (n x 2) (118)  |        |                   |                |
+------+----------------+--------+-------------------+----------------+
| PER  | Dl + table +   |        | Same as           | TBD            |
|      | hktable        |        |                   |                |
|      |                |        | 'HP-STI           |                |
|      | (n x 3) (all   |        | -SSP-3/4-DESCENT' |                |
|      | modes)         |        |                   |                |
+------+----------------+--------+-------------------+----------------+
| REF  | DL+ table +    |        | Same as           | TBD            |
|      | array/image +  |        |                   |                |
|      | hktable (all   |        | 'HP-STI           |                |
|      | modes)         |        | -SSP-3/4-DESCENT' |                |
|      |                |        |                   |                |
|      | (n x 3) (512)  |        |                   |                |
+------+----------------+--------+-------------------+----------------+
| THP  | DL + table +   |        | Same as           | TBD            |
|      | array +        |        |                   |                |
|      | hktable(all    |        | 'HP-STI           |                |
|      | modes)         |        | -SSP-3/4-DESCENT' |                |
|      |                |        |                   |                |
|      | (n x 5) (60)   |        |                   |                |
+------+----------------+--------+-------------------+----------------+
| TIL  | DL + table     |        | Same as           | TBD            |
|      | (all modes)    |        |                   |                |
|      |                |        | 'HP-STI           |                |
|      | (n x 12)       |        | -SSP-3/4-DESCENT' |                |
+------+----------------+--------+-------------------+----------------+
| HK   | DL + table     |        | Same as           | TBD            |
|      | (all modes)    |        |                   |                |
|      |                |        | 'HP-STI           |                |
|      | (n x 11+)      |        | -SSP-3/4-DESCENT' |                |
+------+----------------+--------+-------------------+----------------+
| ST   | DL + table     |        | Same as           | TBD            |
| ATUS |                |        |                   |                |
|      | (TBD)          |        | 'HP-STI           |                |
|      |                |        | -SSP-3/4-DESCENT' |                |
+------+----------------+--------+-------------------+----------------+

**Table 4: SSP data types and presentation to the PDS archive -- data
processing level 3**

Table 5 contains the data types for the calibrated data, data processing
level 4 in PDS standard.

  ------------ ---------------------------- -------------------------------------- -----------------------------
  **Sensor**   **HP-STI-SSP-3/4-DESCENT**   **HP-CRU-SSP-3/4-FLIGHT-CHECK-OUTS**   **HP-CAL-SSP-3-LABORATORY**

  ACC-E        No data (publication)        TBD                                    No (calibration report)

  ACC-I        No data, (publication)       TBD                                    No (calibration report)

  API-V        Table (TBC) (speed of sound) TBD                                    No (calibration report)

  API-S        No data (publication)        TBD                                    No (calibration report)

  DEN          No data (publication)        TBD                                    No (calibration report)

  PER          No data (publication)        TBD                                    No (calibration report)

  REF          No data (publication)        TBD                                    No (calibration report)

  THP          Table (TBC) (temperatures,   TBD                                    No (calibration report)
               diffusivity)                                                        

  TIL          Table (TBC) (angles)         TBD                                    No (calibration report)

  HK           Table (TBC) (temperatures)   TBD                                    No (calibration report)

  STATUS       TBD                          TBD                                    No (calibration report)

                                                                                   No (calibration report)
  ------------ ---------------------------- -------------------------------------- -----------------------------

**Table 5: SSP data -- submitting initial analysis and interpretation to
the PDS archive -- data**

**processing level 4**

## Directories

#### ***Root Directory***

The following directory structure is found under the Root directory.

#### ***Calibration Directory***

The calibration data will be archived in the 'calib' directory below the
root directory, as

-   /calib/{sensor}/filename

> with sensor = {ACCI, ACCE, APIS, APIV, DEN, PER, REF, THP, TIL, HK,
> (STATUS TBC)}

The content of the calibration directory will be organised in similar
way to the HP-STI-SSP-3/4-DESCENT and the
HP-CRU-SSP-3/4-FLIGHT-CHECK-OUTS data sets. As the
HP-CRU-SSP-3/4-FLIGHT-CHECK-OUTS data set will be finished before the
delivery of the descent data sets, the calibration information will not
be updated in this data set. A note will be put in the catalog files to
explicitely warn future users of this fact and point them to the
calibration information that will be delivered with the descent data set
that might have been updated and improved.

#### ***Catalog Directory***

The catalog directory is likely to contain a catalog file for each of
the sensors (TBD):

-   HP-SSP-ACC-E.CAT

-   HP-SSP-ACC-I.CAT

-   HP-SSP-API-V.CAT

-   HP-SSP-API-S.CAT

-   HP-SSP-DEN.CAT

-   HP-SSP-PER.CAT

-   HP-SSP-REF.CAT

-   HP-SSP-THP.CAT

-   HP-SSP-TIL.CAT

-   HP-SSP-HK.CAT

-   HP-SSP-STATUS.CAT

Further a data set catalogue, mission catalogue, instrument host
catalogue, reference catalogue and personnel catalogue may be be
provided (TBC).

#### ***Index Directory***

\[The basic assumption for this subchapter is that information

-   likely to be updated shall be stored in index files,

-   likely to be used in database designs shall be stored in index
    files,

-   not clearly known during the design phase (e.g. cross-instrument
    information, environmental conditions)

belongs here.

An example is the information on FOV (field of view) of an imaging
instrument. The information may also go into a data product label. If
however after the official data delivery an update is required, only the
index files will be updated.\]

Dataset Index File, index.lbl and index.tab

Geometric Index File, geoindex.lbl and geoindex.tab\]

other Index Files\]

#### ***Browse Directory and Browse Files***

Not envisaged for the time being.

#### ***Geometry Directory***

TBD by the DTWG.

#### ***Software Directory***

> \[this directory contains software for data calibration and for data
> visualisation; subdirectories shall be named in such a way that it is
> easy to understand what kind of software, what release and for which
> operating system it is intended; if the content of this directory was
> distributed identically on a previous data set, you can point to the
> former data set. How to point to the former data set needs to be
> defined.\].
>
> No software to be archived (TBC).

#### ***Gazetteer Directory***

TBD by the HSWT.

#### ***Label Directory***

The label directory will not be used for SSP.

#### ***Document Directory***

#### ***Extras Directory***

Digital images of test equipment, sensors etc will be put on this
directory. Types and sizes is TBD.

#### ***Data Directory***

> see pages 10 to 13 for details on data directory naming conventions
> and formats. The Directory structure may consist of the two top level
> data directories called 'pre-flight' and 'in-flight' data.
>
> Within each top level directory, the SSP sensor data will be archived.
> The type of data most likely to be contained in the pre-flight and
> in-flight is listed below.

Pre-Flight Data

> The following pre-flight data are likely to be made available (TBC):

  ------------------------- -------------------------- ------------------
  **Pre-Flight Data**       **Status**                 **Expected Data
                                                       Volume**

  Laboratory data           Selected data will be      TBD
                            archived                   

  Campaign data             Not available              n/a

  EMC data                  Included in laboratory     n/a
                            data                       
  ------------------------- -------------------------- ------------------

> In-Flight Data

  ------------------------- ------------------------- -------------------
  **In-Flight Data**        **Status**                **Expected Data
                                                      Volume**

  In-flight check-outs      will be archived          14 \* \~50Mbytes

  Descent data              Will be archived          \< 1Mbyte
  ------------------------- ------------------------- -------------------

Cross-Instrument Calibration - TBD

## Software

No software is required to read the data as all SSP data is in ASCII
format.

## Documentation

The documentation directory will contain at least the following
documents:

\(1\) On-board Software User Guide

\(2\) EID-B

\(3\) SP-1177, SSP

\(4\) Publication in scientific journals

The format of the documentation may vary and may be very old.
Reformatting is done on a best effort basis. The conversion to ASCII
format will also be done on a best effort basis. Documents that cause a
format problem will be provided as they are in the extras directory.
Important images and diagrams will be converted to the PNG or JPG
format.

## Derived and other Data Products

The dervied data products will be in the form of publications and on a
longer time scale - therefore no plans exist at te time of writing this
document to archive such higher order data products (TBC).

# Detailed Interface Specifications

Structure and Organization Overview

> see section x.y

## Sample Labels

### ACCE - Data Label 1 (see 'ACCE_MODE5_TABLE' data product, page 37)

> PDS_VERSION_ID = PDS3
>
> /\* FILE CHARACTERISTICS DATA ELEMENTS \*/
>
> RECORD_TYPE = FIXED_LENGTH
>
> RECORD_BYTES = NULL
>
> FILE_RECORDS = NULL
>
> /\* DATA OBJECT POINTER IDENTIFICATION ELEMENTS \*/
>
> \^ACCE_MODE5_TABLE = "HP-SSP-ACCE-M5-R-IMPACT.TAB"
>
> /\* INSTRUMENT AND DETECTOR DESCRIPTIVE DATA ELEMENTS \*/
>
> FILE_NAME = "HP-SSP-ACCE-M5-R-IMPACT.LBL"
>
> DATA_SET_ID = HP-STI-SSP-3/4-DESCENT-V1.0
>
> DATA_SET_NAME = "HUYGENS DESCENT RAW AND CALIBRATED DATA V1.0"
>
> PRODUCT_ID = "HP-SSP-ACCE-M5-R-IMPACT.LBL"
>
> PRODUCT_CREATION_TIME = 2001-12-24T00:00:00
>
> MISSION_NAME = "CASSINI-HUYGENS"
>
> INSTRUMENT_HOST_NAME = "HUYGENS PROBE"
>
> INSTRUMENT_HOST_ID = HP
>
> MISSION_PHASE_NAME = "MODE--5(impact profile)"
>
> PRODUCT_TYPE = EDR /\* EDR for RAW, RDR for calibrated data, TBC \*/
>
> START_TIME = NULL /\* in UTC, e.g. 2004-11-12T00:00:00.000Z \*/
>
> STOP_TIME = NULL
>
> SPACECRAFT_CLOCK_T0_START_TIME = NULL /\* seconds.milliseconds \*/
>
> SPACECRAFT_CLOCK_STOP\_ T0_TIME = NULL
>
> PRODUCER_ID = "HP-SSP-OU"
>
> PRODUCER_FULL_NAME = "BRIJEN HATHI"
>
> PRODUCER_INSTITUTION_NAME = "OPEN UNIVERSITY, PSSRI"
>
> TARGET_NAME = "TITAN"
>
> /\* INSTRUMENT DESCRIPTION \*/
>
> INSTRUMENT_ID = "SSP"
>
> INSTRUMENT_NAME = "SURFACE SCIENCE PACKAGE"
>
> INSTRUMENT_TYPE = NULL /\* SEE TABLE BELOW \*/
>
> DATA_QUALITY_ID = NULL /\* NEEDS DEFINITION IN_QUALITY.CAT, SEE TABLE
> BELOW \*/
>
> INSTRUMENT_MODE_ID = MODE5 /\* NEEDS DEFINITION IN SSP_MODES.CAT \*/
>
> /\* DATA OBJECT DEFINITION \*/

### ACCE - Data Label 2 (see 'ACCE_MODE123_DN_SERIES' data product, page 38 )

> PDS_VERSION_ID = PDS3
>
> /\* FILE CHARACTERISTICS DATA ELEMENTS \*/
>
> RECORD_TYPE = FIXED_LENGTH
>
> RECORD_BYTES = NULL
>
> FILE_RECORDS = NULL
>
> /\* DATA OBJECT POINTER IDENTIFICATION ELEMENTS \*/
>
> \^ACCE_MODE123_DN_SERIES = "HP-SSP-ACCE-M123-R.TAB"
>
> /\* INSTRUMENT AND DETECTOR DESCRIPTIVE DATA ELEMENTS \*/
>
> FILE_NAME = "HP-SSP-ACCE-M123-R.LBL"
>
> DATA_SET_ID = HP-STI-SSP-3/4-DESCENT-V1.0
>
> DATA_SET_NAME = "HUYGENS DESCENT RAW AND CALIBRATED DATA V1.0"
>
> PRODUCT_ID = "HP-SSP-ACCE-M123-R.LBL"
>
> PRODUCT_CREATION_TIME = 2001-12-24T00:00:00
>
> MISSION_NAME = "CASSINI-HUYGENS"
>
> INSTRUMENT_HOST_NAME = "HUYGENS PROBE"
>
> INSTRUMENT_HOST_ID = HP
>
> MISSION_PHASE_NAME = "MODES--1,2,3(Atoms)"
>
> PRODUCT_TYPE = EDR /\* EDR for RAW, RDR for calibrated data, TBC \*/
>
> START_TIME = NULL /\* in UTC, e.g. 2004-11-12T00:00:00.000Z \*/
>
> STOP_TIME = NULL
>
> SPACECRAFT_CLOCK_T0_START_TIME = NULL /\* seconds.milliseconds \*/
>
> SPACECRAFT_CLOCK_STOP\_ T0_TIME = NULL
>
> PRODUCER_ID = "HP-SSP-OU"
>
> PRODUCER_FULL_NAME = "BRIJEN HATHI"
>
> PRODUCER_INSTITUTION_NAME = "OPEN UNIVERSITY, PSSRI"
>
> TARGET_NAME = "TITAN"
>
> /\* INSTRUMENT DESCRIPTION \*/
>
> INSTRUMENT_ID = "SSP"
>
> INSTRUMENT_NAME = "SURFACE SCIENCE PACKAGE"
>
> INSTRUMENT_TYPE = NULL /\* SEE TABLE BELOW \*/
>
> DATA_QUALITY_ID = NULL /\* NEEDS DEFINITION IN_QUALITY.CAT, SEE TABLE
> BELOW \*/
>
> INSTRUMENT_MODE_ID = MODE123 /\* NEEDS DEFINITION IN SSP_MODES.CAT \*/
>
> /\* DATA OBJECT DEFINITION \*/

### ACCI - Data Label 1 (see 'ACCI_MODE5_TABLE' data product, page 39)

> PDS_VERSION_ID = PDS3
>
> /\* FILE CHARACTERISTICS DATA ELEMENTS \*/
>
> RECORD_TYPE = FIXED_LENGTH
>
> RECORD_BYTES = NULL
>
> FILE_RECORDS = NULL
>
> /\* DATA OBJECT POINTER IDENTIFICATION ELEMENTS \*/
>
> \^ACCI_MODE5_TABLE = "HP-SSP-ACCI-M5-R-IMPACT.TAB"
>
> /\* INSTRUMENT AND DETECTOR DESCRIPTIVE DATA ELEMENTS \*/
>
> FILE_NAME = "HP-SSP-ACCI-M5-R-IMPACT.LBL"
>
> DATA_SET_ID = HP-STI-SSP-3/4-DESCENT-V1.0
>
> DATA_SET_NAME = "HUYGENS DESCENT RAW AND CALIBRATED DATA V1.0"
>
> PRODUCT_ID = "HP-SSP-ACCI-M5-R-IMPACT.LBL"
>
> PRODUCT_CREATION_TIME = 2001-12-24T00:00:00
>
> MISSION_NAME = "CASSINI-HUYGENS"
>
> INSTRUMENT_HOST_NAME = "HUYGENS PROBE"
>
> INSTRUMENT_HOST_ID = HP
>
> MISSION_PHASE_NAME = "MODE--5(impact profile)"
>
> PRODUCT_TYPE = EDR /\* EDR for RAW, RDR for calibrated data, TBC \*/
>
> START_TIME = NULL /\* in UTC, e.g. 2004-11-12T00:00:00.000Z \*/
>
> STOP_TIME = NULL
>
> SPACECRAFT_CLOCK_T0_START_TIME = NULL /\* seconds.milliseconds \*/
>
> SPACECRAFT_CLOCK_STOP\_ T0_TIME = NULL
>
> PRODUCER_ID = "HP-SSP-OU"
>
> PRODUCER_FULL_NAME = "BRIJEN HATHI"
>
> PRODUCER_INSTITUTION_NAME = "OPEN UNIVERSITY, PSSRI"
>
> TARGET_NAME = "TITAN"
>
> /\* INSTRUMENT DESCRIPTION \*/
>
> INSTRUMENT_ID = "SSP"
>
> INSTRUMENT_NAME = "SURFACE SCIENCE PACKAGE"
>
> INSTRUMENT_TYPE = NULL /\* SEE TABLE BELOW \*/
>
> DATA_QUALITY_ID = NULL /\* NEEDS DEFINITION IN_QUALITY.CAT, SEE TABLE
> BELOW \*/
>
> INSTRUMENT_MODE_ID = MODE5 /\* NEEDS DEFINITION IN SSP_MODES.CAT \*/
>
> /\* DATA OBJECT DEFINITION \*/

### ACCI - Data Label 2 (see 'ACCI_MODE1236_TABLE' data product, page 40)

> PDS_VERSION_ID = PDS3
>
> /\* FILE CHARACTERISTICS DATA ELEMENTS \*/
>
> RECORD_TYPE = FIXED_LENGTH
>
> RECORD_BYTES = NULL
>
> FILE_RECORDS = NULL
>
> /\* DATA OBJECT POINTER IDENTIFICATION ELEMENTS \*/
>
> \^ACCI_MODE1236_TABLE = "HP-SSP-ACCI-M1236-R.TAB"
>
> \^HK_TEMP_TABLE = "HP-SSP-HK-M123456-R.TAB"
>
> /\* INSTRUMENT AND DETECTOR DESCRIPTIVE DATA ELEMENTS \*/
>
> FILE_NAME = "HP-SSP-ACCI-M1236-R.LBL"
>
> DATA_SET_ID = HP-STI-SSP-3/4-DESCENT-V1.0
>
> DATA_SET_NAME = "HUYGENS DESCENT RAW AND CALIBRATED DATA V1.0"
>
> PRODUCT_ID = "HP-SSP-ACCI-M1236-R.LBL"
>
> PRODUCT_CREATION_TIME = 2001-12-24T00:00:00
>
> MISSION_NAME = "CASSINI-HUYGENS"
>
> INSTRUMENT_HOST_NAME = "HUYGENS PROBE"
>
> INSTRUMENT_HOST_ID = HP
>
> MISSION_PHASE_NAME = "MODES--123(ATMOS) and 6(surface)"
>
> PRODUCT_TYPE = EDR /\* EDR for RAW, RDR for calibrated data, TBC \*/
>
> START_TIME = NULL /\* in UTC, e.g. 2004-11-12T00:00:00.000Z \*/
>
> STOP_TIME = NULL
>
> SPACECRAFT_CLOCK_T0_START_TIME = NULL /\* seconds.milliseconds \*/
>
> SPACECRAFT_CLOCK_STOP\_ T0_TIME = NULL
>
> PRODUCER_ID = "HP-SSP-OU"
>
> PRODUCER_FULL_NAME = "BRIJEN HATHI"
>
> PRODUCER_INSTITUTION_NAME = "OPEN UNIVERSITY, PSSRI"
>
> TARGET_NAME = "TITAN"
>
> /\* INSTRUMENT DESCRIPTION \*/
>
> INSTRUMENT_ID = "SSP"
>
> INSTRUMENT_NAME = "SURFACE SCIENCE PACKAGE"
>
> INSTRUMENT_TYPE = NULL /\* SEE TABLE BELOW \*/
>
> DATA_QUALITY_ID = NULL /\* NEEDS DEFINITION IN_QUALITY.CAT, SEE TABLE
> BELOW \*/
>
> INSTRUMENT_MODE_ID = MODE1236 /\* NEEDS DEFINITION IN SSP_MODES.CAT
> \*/
>
> /\* DATA OBJECT DEFINITION \*/

### APIS - Data Label 1 (see 'APIS_MODE23_TABLE' data product, page 42) 

> PDS_VERSION_ID = PDS3
>
> /\* FILE CHARACTERISTICS DATA ELEMENTS \*/
>
> RECORD_TYPE = FIXED_LENGTH
>
> RECORD_BYTES = NULL
>
> FILE_RECORDS = NULL
>
> /\* DATA OBJECT POINTER IDENTIFICATION ELEMENTS \*/
>
> \^APIS_MODE23_DATA_TABLE = "HP-SSP-APIS-M23-R-ATMOS.TAB"
>
> /\* INSTRUMENT AND DETECTOR DESCRIPTIVE DATA ELEMENTS \*/
>
> FILE_NAME = "HP-SSP-APIS-M23-R-ATMOS.LBL"
>
> DATA_SET_ID = HP-STI-SSP-3/4-DESCENT-V1.0
>
> DATA_SET_NAME = "HUYGENS DESCENT RAW AND CALIBRATED DATA V1.0"
>
> PRODUCT_ID = "HP-SSP-APIS-M23-R-ATMOS.LBL"
>
> PRODUCT_CREATION_TIME = 2001-12-24T00:00:00
>
> MISSION_NAME = "CASSINI-HUYGENS"
>
> INSTRUMENT_HOST_NAME = "HUYGENS PROBE"
>
> INSTRUMENT_HOST_ID = HP
>
> MISSION_PHASE_NAME = "ATMOSPHERE MODES - 2, and 3"
>
> PRODUCT_TYPE = EDR /\* EDR for RAW, RDR for calibrated data, TBC \*/
>
> START_TIME = NULL /\* in UTC, e.g. 2004-11-12T00:00:00.000Z \*/
>
> STOP_TIME = NULL
>
> SPACECRAFT_CLOCK_T0_START_TIME = NULL /\* seconds.milliseconds \*/
>
> SPACECRAFT_CLOCK_STOP\_ T0_TIME = NULL
>
> PRODUCER_ID = "HP-SSP-OU"
>
> PRODUCER_FULL_NAME = "BRIJEN HATHI"
>
> PRODUCER_INSTITUTION_NAME = "OPEN UNIVERSITY, PSSRI"
>
> TARGET_NAME = "TITAN"
>
> /\* INSTRUMENT DESCRIPTION \*/
>
> INSTRUMENT_ID = "SSP"
>
> INSTRUMENT_NAME = "SURFACE SCIENCE PACKAGE"
>
> INSTRUMENT_TYPE = NULL /\* SEE TABLE BELOW \*/
>
> DATA_QUALITY_ID = NULL /\* NEEDS DEFINITION IN_QUALITY.CAT, SEE TABLE
> BELOW \*/
>
> INSTRUMENT_MODE_ID = MODE23 /\* NEEDS DEFINITION IN SSP_MODES.CAT \*/
>
> /\* DATA OBJECT DEFINITION \*/

### APIS - Data Label 2 (see 'APIS_MODE4_TABLE' data product, page 43) 

> PDS_VERSION_ID = PDS3
>
> /\* FILE CHARACTERISTICS DATA ELEMENTS \*/
>
> RECORD_TYPE = FIXED_LENGTH
>
> RECORD_BYTES = NULL
>
> FILE_RECORDS = NULL
>
> /\* DATA OBJECT POINTER IDENTIFICATION ELEMENTS \*/
>
> \^APIS_MODE4_TABLE = "HP-SSP-APIS-M4-R-PROX.TAB"
>
> /\* INSTRUMENT AND DETECTOR DESCRIPTIVE DATA ELEMENTS \*/
>
> FILE_NAME = "HP-SSP-APIS-M4-R-PROX.LBL"
>
> DATA_SET_ID = HP-STI-SSP-3/4-DESCENT-V1.0
>
> DATA_SET_NAME = "HUYGENS DESCENT RAW AND CALIBRATED DATA V1.0"
>
> PRODUCT_ID = "HP-SSP-APIS-M123-R-ATMOS.LBL"
>
> PRODUCT_CREATION_TIME = 2001-12-24T00:00:00
>
> MISSION_NAME = "CASSINI-HUYGENS"
>
> INSTRUMENT_HOST_NAME = "HUYGENS PROBE"
>
> INSTRUMENT_HOST_ID = HP
>
> MISSION_PHASE_NAME = "PROXIMITY MODE - 4"
>
> PRODUCT_TYPE = EDR /\* EDR for RAW, RDR for calibrated data, TBC \*/
>
> START_TIME = NULL /\* in UTC, e.g. 2004-11-12T00:00:00.000Z \*/
>
> STOP_TIME = NULL
>
> SPACECRAFT_CLOCK_T0_START_TIME = NULL /\* seconds.milliseconds \*/
>
> SPACECRAFT_CLOCK_STOP\_ T0_TIME = NULL
>
> PRODUCER_ID = "HP-SSP-OU"
>
> PRODUCER_FULL_NAME = "BRIJEN HATHI"
>
> PRODUCER_INSTITUTION_NAME = "OPEN UNIVERSITY, PSSRI"
>
> TARGET_NAME = "TITAN"
>
> /\* INSTRUMENT DESCRIPTION \*/
>
> INSTRUMENT_ID = "SSP"
>
> INSTRUMENT_NAME = "SURFACE SCIENCE PACKAGE"
>
> INSTRUMENT_TYPE = NULL /\* SEE TABLE BELOW \*/
>
> DATA_QUALITY_ID = NULL /\* NEEDS DEFINITION IN_QUALITY.CAT, SEE TABLE
> BELOW \*/
>
> INSTRUMENT_MODE_ID = MODE4 /\* NEEDS DEFINITION IN SSP_MODES.CAT \*/
>
> /\* DATA OBJECT DEFINITION \*/

### APIS - Data Label 3 (see 'APIS_MODE6_TABLE' data product, page 44) 

> PDS_VERSION_ID = PDS3
>
> /\* FILE CHARACTERISTICS DATA ELEMENTS \*/
>
> RECORD_TYPE = FIXED_LENGTH
>
> RECORD_BYTES = NULL
>
> FILE_RECORDS = NULL
>
> /\* DATA OBJECT POINTER IDENTIFICATION ELEMENTS \*/
>
> \^APIS_MODE6_TABLE = "HP-SSP-APIS-M6-R-SURF.TAB"
>
> /\* INSTRUMENT AND DETECTOR DESCRIPTIVE DATA ELEMENTS \*/
>
> FILE_NAME = "HP-SSP-APIS-M6-R-SURF.LBL"
>
> DATA_SET_ID = HP-STI-SSP-3/4-DESCENT-V1.0
>
> DATA_SET_NAME = "HUYGENS DESCENT RAW AND CALIBRATED DATA V1.0"
>
> PRODUCT_ID = "HP-SSP-APIS-M6-R-SURF.LBL"
>
> PRODUCT_CREATION_TIME = 2001-12-24T00:00:00
>
> MISSION_NAME = "CASSINI-HUYGENS"
>
> INSTRUMENT_HOST_NAME = "HUYGENS PROBE"
>
> INSTRUMENT_HOST_ID = HP
>
> MISSION_PHASE_NAME = "SURFACE MODE - 6"
>
> PRODUCT_TYPE = EDR /\* EDR for RAW, RDR for calibrated data, TBC \*/
>
> START_TIME = NULL /\* in UTC, e.g. 2004-11-12T00:00:00.000Z \*/
>
> STOP_TIME = NULL
>
> SPACECRAFT_CLOCK_T0_START_TIME = NULL /\* seconds.milliseconds \*/
>
> SPACECRAFT_CLOCK_STOP\_ T0_TIME = NULL
>
> PRODUCER_ID = "HP-SSP-OU"
>
> PRODUCER_FULL_NAME = "BRIJEN HATHI"
>
> PRODUCER_INSTITUTION_NAME = "OPEN UNIVERSITY, PSSRI"
>
> TARGET_NAME = "TITAN"
>
> /\* INSTRUMENT DESCRIPTION \*/
>
> INSTRUMENT_ID = "SSP"
>
> INSTRUMENT_NAME = "SURFACE SCIENCE PACKAGE"
>
> INSTRUMENT_TYPE = NULL /\* SEE TABLE BELOW \*/
>
> DATA_QUALITY_ID = NULL /\* NEEDS DEFINITION IN_QUALITY.CAT, SEE TABLE
> BELOW \*/
>
> INSTRUMENT_MODE_ID = MODE6 /\* NEEDS DEFINITION IN SSP_MODES.CAT \*/
>
> /\* DATA OBJECT DEFINITION \*/

### APIV - Data Label (see 'APIV_MODE123456_TABLE' data product, page 45) 

> PDS_VERSION_ID = PDS3
>
> /\* FILE CHARACTERISTICS DATA ELEMENTS \*/
>
> RECORD_TYPE = FIXED_LENGTH
>
> RECORD_BYTES = NULL
>
> FILE_RECORDS = NULL
>
> /\* DATA OBJECT POINTER IDENTIFICATION ELEMENTS \*/
>
> \^APIV_MODE123456_TABLE = "HP-SSP-APIV-M123456-R.TAB"
>
> \^HK_TEMPS_TABLE = "HP-SSP-HK-M123456-R.TAB"
>
> /\* INSTRUMENT AND DETECTOR DESCRIPTIVE DATA ELEMENTS \*/
>
> FILE_NAME = "HP-SSP-APIV-M123456-R.LBL"
>
> DATA_SET_ID = HP-STI-SSP-3/4-DESCENT-V1.0
>
> DATA_SET_NAME = "HUYGENS DESCENT RAW AND CALIBRATED DATA V1.0"
>
> PRODUCT_ID = "HP-SSP-APIV-M123456-R.LBL"
>
> PRODUCT_CREATION_TIME = 2001-12-24T00:00:00
>
> MISSION_NAME = "CASSINI-HUYGENS"
>
> INSTRUMENT_HOST_NAME = "HUYGENS PROBE"
>
> INSTRUMENT_HOST_ID = HP
>
> MISSION_PHASE_NAME = "ALL MODES"
>
> PRODUCT_TYPE = EDR /\* EDR for RAW, RDR for calibrated data, TBC \*/
>
> START_TIME = NULL /\* in UTC, e.g. 2004-11-12T00:00:00.000Z \*/
>
> STOP_TIME = NULL
>
> SPACECRAFT_CLOCK_T0_START_TIME = NULL /\* seconds.milliseconds \*/
>
> SPACECRAFT_CLOCK_STOP\_ T0_TIME = NULL
>
> PRODUCER_ID = "HP-SSP-OU"
>
> PRODUCER_FULL_NAME = "BRIJEN HATHI"
>
> PRODUCER_INSTITUTION_NAME = "OPEN UNIVERSITY, PSSRI"
>
> TARGET_NAME = "TITAN"
>
> /\* INSTRUMENT DESCRIPTION \*/
>
> INSTRUMENT_ID = "SSP"
>
> INSTRUMENT_NAME = "SURFACE SCIENCE PACKAGE"
>
> INSTRUMENT_TYPE = NULL /\* SEE TABLE BELOW \*/
>
> DATA_QUALITY_ID = NULL /\* NEEDS DEFINITION IN_QUALITY.CAT, SEE TABLE
> BELOW \*/
>
> INSTRUMENT_MODE_ID = MODE123456 /\* NEEDS DEFINITION IN SSP_MODES.CAT
> \*/
>
> /\* DATA OBJECT DEFINITION \*/

### DEN Data Label (see 'DEN_MODE123456_TABLE' data product, page 46) 

> PDS_VERSION_ID = PDS3
>
> /\* FILE CHARACTERISTICS DATA ELEMENTS \*/
>
> RECORD_TYPE = FIXED_LENGTH
>
> RECORD_BYTES = NULL
>
> FILE_RECORDS = NULL
>
> /\* DATA OBJECT POINTER IDENTIFICATION ELEMENTS \*/
>
> \^DEN_MODE123456_TABLE = "HP-SSP-DEN-M123456-R.TAB"
>
> /\* INSTRUMENT AND DETECTOR DESCRIPTIVE DATA ELEMENTS \*/
>
> FILE_NAME = "HP-SSP-DEN-M123456-R.LBL"
>
> DATA_SET_ID = HP-STI-SSP-3/4-DESCENT-V1.0
>
> DATA_SET_NAME = "HUYGENS DESCENT RAW AND CALIBRATED DATA V1.0"
>
> PRODUCT_ID = "HP-SSP-DEN-M123456-R.LBL"
>
> PRODUCT_CREATION_TIME = 2001-12-24T00:00:00
>
> MISSION_NAME = "CASSINI-HUYGENS"
>
> INSTRUMENT_HOST_NAME = "HUYGENS PROBE"
>
> INSTRUMENT_HOST_ID = HP
>
> MISSION_PHASE_NAME = "ALL MODES--1(descent)to 6(surface)"
>
> PRODUCT_TYPE = EDR /\* EDR for RAW, RDR for calibrated data, TBC \*/
>
> START_TIME = NULL /\* in UTC, e.g. 2004-11-12T00:00:00.000Z \*/
>
> STOP_TIME = NULL
>
> SPACECRAFT_CLOCK_T0_START_TIME = NULL /\* seconds.milliseconds \*/
>
> SPACECRAFT_CLOCK_STOP\_ T0_TIME = NULL
>
> PRODUCER_ID = "HP-SSP-OU"
>
> PRODUCER_FULL_NAME = "BRIJEN HATHI"
>
> PRODUCER_INSTITUTION_NAME = "OPEN UNIVERSITY, PSSRI"
>
> TARGET_NAME = "TITAN"
>
> /\* INSTRUMENT DESCRIPTION \*/
>
> INSTRUMENT_ID = "SSP"
>
> INSTRUMENT_NAME = "SURFACE SCIENCE PACKAGE"
>
> INSTRUMENT_TYPE = NULL /\* SEE TABLE BELOW \*/
>
> DATA_QUALITY_ID = NULL /\* NEEDS DEFINITION IN_QUALITY.CAT, SEE TABLE
> BELOW \*/
>
> INSTRUMENT_MODE_ID = MODE123456 /\* NEEDS DEFINITION IN SSP_MODES.CAT
> \*/
>
> /\* DATA OBJECT DEFINITION \*/

### PER Data Label (see 'PER_MODE123456_TABLE' data product, pages 52 to 54)

> PDS_VERSION_ID = PDS3
>
> /\* FILE CHARACTERISTICS DATA ELEMENTS \*/
>
> RECORD_TYPE = FIXED_LENGTH
>
> RECORD_BYTES = NULL
>
> FILE_RECORDS = NULL
>
> /\* DATA OBJECT POINTER IDENTIFICATION ELEMENTS \*/
>
> \^PER_MODE123456_TABLE1 = "HP-SSP-PER-M123456-R.TAB"
>
> \^PER_MODE123456_TABLE2 = "HP-SSP-PERHK-M123456-R.TAB"
>
> /\* INSTRUMENT AND DETECTOR DESCRIPTIVE DATA ELEMENTS \*/
>
> FILE_NAME = "HP-SSP-PER-M123456-R.LBL"
>
> DATA_SET_ID = HP-STI-SSP-3/4-DESCENT-V1.0
>
> DATA_SET_NAME = "HUYGENS DESCENT RAW AND CALIBRATED DATA V1.0"
>
> PRODUCT_ID = "HP-SSP-PER-M123456-R.LBL"
>
> PRODUCT_CREATION_TIME = 2001-12-24T00:00:00
>
> MISSION_NAME = "CASSINI-HUYGENS"
>
> INSTRUMENT_HOST_NAME = "HUYGENS PROBE"
>
> INSTRUMENT_HOST_ID = HP
>
> MISSION_PHASE_NAME = "ALL MODES--1(descent)to 6(surface)"
>
> PRODUCT_TYPE = EDR /\* EDR for RAW, RDR for calibrated data, TBC \*/
>
> START_TIME = NULL /\* in UTC, e.g. 2004-11-12T00:00:00.000Z \*/
>
> STOP_TIME = NULL
>
> SPACECRAFT_CLOCK_T0_START_TIME = NULL /\* seconds.milliseconds \*/
>
> SPACECRAFT_CLOCK_STOP\_ T0_TIME = NULL
>
> PRODUCER_ID = "HP-SSP-OU"
>
> PRODUCER_FULL_NAME = "BRIJEN HATHI"
>
> PRODUCER_INSTITUTION_NAME = "OPEN UNIVERSITY, PSSRI"
>
> TARGET_NAME = "TITAN"
>
> /\* INSTRUMENT DESCRIPTION \*/
>
> INSTRUMENT_ID = "SSP"
>
> INSTRUMENT_NAME = "SURFACE SCIENCE PACKAGE"
>
> INSTRUMENT_TYPE = NULL /\* SEE TABLE BELOW \*/
>
> DATA_QUALITY_ID = NULL /\* NEEDS DEFINITION IN_QUALITY.CAT, SEE TABLE
> BELOW \*/
>
> INSTRUMENT_MODE_ID = MODE123456 /\* NEEDS DEFINITION IN SSP_MODES.CAT
> \*/
>
> /\* DATA OBJECT DEFINITION \*/
>
> PDS_VERSION_ID = PDS3
>
> /\* FILE CHARACTERISTICS DATA ELEMENTS \*/
>
> RECORD_TYPE = FIXED_LENGTH
>
> RECORD_BYTES = NULL
>
> FILE_RECORDS = NULL

### REF - Data Label (see 'REF_MODE123456_TABLE' data product, pages )

> PDS_VERSION_ID = PDS3
>
> /\* FILE CHARACTERISTICS DATA ELEMENTS \*/
>
> RECORD_TYPE = FIXED_LENGTH
>
> RECORD_BYTES = NULL
>
> FILE_RECORDS = NULL
>
> /\* DATA OBJECT POINTER IDENTIFICATION ELEMENTS \*/
>
> \^PER_DATA_TABLE = "HP-SSP-REF-M123456-R.TAB"
>
> \^PER_HK_TABLE = "HP-SSP-REFHK-M123456-R.TAB"
>
> /\* INSTRUMENT AND DETECTOR DESCRIPTIVE DATA ELEMENTS \*/
>
> FILE_NAME = "HP-SSP-REF-M123456-R.LBL"
>
> DATA_SET_ID = HP-STI-SSP-3/4-DESCENT-V1.0
>
> DATA_SET_NAME = "HUYGENS DESCENT RAW AND CALIBRATED DATA V1.0"
>
> PRODUCT_ID = "HP-SSP-REF-M123456-R.LBL"
>
> PRODUCT_CREATION_TIME = 2001-12-24T00:00:00
>
> MISSION_NAME = "CASSINI-HUYGENS"
>
> INSTRUMENT_HOST_NAME = "HUYGENS PROBE"
>
> INSTRUMENT_HOST_ID = HP
>
> MISSION_PHASE_NAME = "ALL MODES--1(descent)to 6(surface)"
>
> PRODUCT_TYPE = EDR /\* EDR for RAW, RDR for calibrated data, TBC \*/
>
> START_TIME = NULL /\* in UTC, e.g. 2004-11-12T00:00:00.000Z \*/
>
> STOP_TIME = NULL
>
> SPACECRAFT_CLOCK_T0_START_TIME = NULL /\* seconds.milliseconds \*/
>
> SPACECRAFT_CLOCK_STOP\_ T0_TIME = NULL
>
> PRODUCER_ID = "HP-SSP-OU"
>
> PRODUCER_FULL_NAME = "BRIJEN HATHI"
>
> PRODUCER_INSTITUTION_NAME = "OPEN UNIVERSITY, PSSRI"
>
> TARGET_NAME = "TITAN"
>
> /\* INSTRUMENT DESCRIPTION \*/
>
> INSTRUMENT_ID = "SSP"
>
> INSTRUMENT_NAME = "SURFACE SCIENCE PACKAGE"
>
> INSTRUMENT_TYPE = NULL /\* SEE TABLE BELOW \*/
>
> DATA_QUALITY_ID = NULL /\* NEEDS DEFINITION IN_QUALITY.CAT, SEE TABLE
> BELOW \*/
>
> INSTRUMENT_MODE_ID = MODE123456 /\* NEEDS DEFINITION IN SSP_MODES.CAT
> \*/
>
> /\* DATA OBJECT DEFINITION \*/

### THP -- Data Label (see 'THP_MODE123456_TABLE' data product, page = )

> PDS_VERSION_ID = PDS3
>
> /\* FILE CHARACTERISTICS DATA ELEMENTS \*/
>
> RECORD_TYPE = FIXED_LENGTH
>
> RECORD_BYTES = NULL
>
> FILE_RECORDS = NULL
>
> /\* DATA OBJECT POINTER IDENTIFICATION ELEMENTS \*/
>
> \^THP_DATA_TABLE = "HP-SSP-THP-M123456-R.TAB"
>
> \^THP_HK_TABLE = "HP-SSP-THPHK-M123456-R.TAB"
>
> /\* INSTRUMENT AND DETECTOR DESCRIPTIVE DATA ELEMENTS \*/
>
> FILE_NAME = "HP-SSP-THP-M123456-R.LBL"
>
> DATA_SET_ID = HP-STI-SSP-3/4-DESCENT-V1.0
>
> DATA_SET_NAME = "HUYGENS DESCENT RAW AND CALIBRATED DATA V1.0"
>
> PRODUCT_ID = "HP-SSP-THP-M123456-R.LBL"
>
> PRODUCT_CREATION_TIME = 2001-12-24T00:00:00
>
> MISSION_NAME = "CASSINI-HUYGENS"
>
> INSTRUMENT_HOST_NAME = "HUYGENS PROBE"
>
> INSTRUMENT_HOST_ID = HP
>
> MISSION_PHASE_NAME = "ALL MODES--1(descent)to 6(surface)"
>
> PRODUCT_TYPE = EDR /\* EDR for RAW, RDR for calibrated data, TBC \*/
>
> START_TIME = NULL /\* in UTC, e.g. 2004-11-12T00:00:00.000Z \*/
>
> STOP_TIME = NULL
>
> SPACECRAFT_CLOCK_T0_START_TIME = NULL /\* seconds.milliseconds \*/
>
> SPACECRAFT_CLOCK_STOP\_ T0_TIME = NULL
>
> PRODUCER_ID = "HP-SSP-OU"
>
> PRODUCER_FULL_NAME = "BRIJEN HATHI"
>
> PRODUCER_INSTITUTION_NAME = "OPEN UNIVERSITY, PSSRI"
>
> TARGET_NAME = "TITAN"
>
> /\* INSTRUMENT DESCRIPTION \*/
>
> INSTRUMENT_ID = "SSP"
>
> INSTRUMENT_NAME = "SURFACE SCIENCE PACKAGE"
>
> INSTRUMENT_TYPE = NULL /\* SEE TABLE BELOW \*/
>
> DATA_QUALITY_ID = NULL /\* NEEDS DEFINITION IN_QUALITY.CAT, SEE TABLE
> BELOW \*/
>
> INSTRUMENT_MODE_ID = MODE123456 /\* NEEDS DEFINITION IN SSP_MODES.CAT
> \*/
>
> /\* DATA OBJECT DEFINITION \*/

### TIL Data Label (see 'TIL_MODE123456_TABLE' data product, page = )

> /\* DATA OBJECT POINTER IDENTIFICATION ELEMENTS \*/
>
> \^TIL_DATA_TABLE = "HP-SSP-TIL-M123456-R.TAB"
>
> \^TIL_HK_TABLE = "HP-SSP-TILHK-M123456-R.TAB"
>
> /\* INSTRUMENT AND DETECTOR DESCRIPTIVE DATA ELEMENTS \*/
>
> FILE_NAME = "HP-SSP-TIL-M123456-R.LBL"
>
> DATA_SET_ID = HP-STI-SSP-3/4-DESCENT-V1.0
>
> DATA_SET_NAME = "HUYGENS DESCENT RAW AND CALIBRATED DATA V1.0"
>
> PRODUCT_ID = "HP-SSP-TIL-M123456-R.LBL"
>
> PRODUCT_CREATION_TIME = 2001-12-24T00:00:00
>
> MISSION_NAME = "CASSINI-HUYGENS"
>
> INSTRUMENT_HOST_NAME = "HUYGENS PROBE"
>
> INSTRUMENT_HOST_ID = HP
>
> MISSION_PHASE_NAME = "ALL MODES--1(descent)to 6(surface)"
>
> PRODUCT_TYPE = EDR /\* EDR for RAW, RDR for calibrated data, TBC \*/
>
> START_TIME = NULL /\* in UTC, e.g. 2004-11-12T00:00:00.000Z \*/
>
> STOP_TIME = NULL
>
> SPACECRAFT_CLOCK_T0_START_TIME = NULL /\* seconds.milliseconds \*/
>
> SPACECRAFT_CLOCK_STOP\_ T0_TIME = NULL
>
> PRODUCER_ID = "HP-SSP-OU"
>
> PRODUCER_FULL_NAME = "BRIJEN HATHI"
>
> PRODUCER_INSTITUTION_NAME = "OPEN UNIVERSITY, PSSRI"
>
> TARGET_NAME = "TITAN"
>
> /\* INSTRUMENT DESCRIPTION \*/
>
> INSTRUMENT_ID = "SSP"
>
> INSTRUMENT_NAME = "SURFACE SCIENCE PACKAGE"
>
> INSTRUMENT_TYPE = NULL /\* SEE TABLE BELOW \*/
>
> DATA_QUALITY_ID = NULL /\* NEEDS DEFINITION IN_QUALITY.CAT, SEE TABLE
> BELOW \*/
>
> INSTRUMENT_MODE_ID = MODE123456 /\* NEEDS DEFINITION IN SSP_MODES.CAT
> \*/
>
> /\* DATA OBJECT DEFINITION \*/

### HK - Data Label 1 

> PDS_VERSION_ID = PDS3
>
> /\* FILE CHARACTERISTICS DATA ELEMENTS \*/
>
> RECORD_TYPE = FIXED_LENGTH
>
> RECORD_BYTES = NULL
>
> FILE_RECORDS = NULL
>
> /\* DATA OBJECT POINTER IDENTIFICATION ELEMENTS \*/
>
> \^ HK_TEMPS_TABLE = "HP-SSP-HKTEMPS-M123456-R.TAB"
>
> /\* INSTRUMENT AND DETECTOR DESCRIPTIVE DATA ELEMENTS \*/
>
> FILE_NAME = "HP-SSP-HKTEMPS-M123456-R.LBL"
>
> DATA_SET_ID = HP-STI-SSP-3/4-DESCENT-V1.0
>
> DATA_SET_NAME = "HUYGENS DESCENT RAW AND CALIBRATED DATA V1.0"
>
> PRODUCT_ID = "HP-SSP-HKTEMPS-M123456-R.LBL"
>
> PRODUCT_CREATION_TIME = 2001-12-24T00:00:00
>
> MISSION_NAME = "CASSINI-HUYGENS"
>
> INSTRUMENT_HOST_NAME = "HUYGENS PROBE"
>
> INSTRUMENT_HOST_ID = HP
>
> MISSION_PHASE_NAME = "ALL MODES --1 to 6"
>
> PRODUCT_TYPE = EDR /\* EDR for RAW, RDR for calibrated data, TBC \*/
>
> START_TIME = NULL /\* in UTC, e.g. 2004-11-12T00:00:00.000Z \*/
>
> STOP_TIME = NULL
>
> SPACECRAFT_CLOCK_T0_START_TIME = NULL /\* seconds.milliseconds \*/
>
> SPACECRAFT_CLOCK_STOP\_ T0_TIME = NULL
>
> PRODUCER_ID = "HP-SSP-OU"
>
> PRODUCER_FULL_NAME = "BRIJEN HATHI"
>
> PRODUCER_INSTITUTION_NAME = "OPEN UNIVERSITY, PSSRI"
>
> TARGET_NAME = "TITAN"
>
> /\* INSTRUMENT DESCRIPTION \*/
>
> INSTRUMENT_ID = "SSP"
>
> INSTRUMENT_NAME = "SURFACE SCIENCE PACKAGE"
>
> INSTRUMENT_TYPE = NULL /\* SEE TABLE BELOW \*/
>
> DATA_QUALITY_ID = NULL /\* NEEDS DEFINITION IN_QUALITY.CAT, SEE TABLE
> BELOW \*/
>
> INSTRUMENT_MODE_ID = MODE123456 /\* NEEDS DEFINITION IN SSP_MODES.CAT
> \*/
>
> /\* DATA OBJECT DEFINITION \*/

### HK - Data Label 2

> PDS_VERSION_ID = PDS3
>
> /\* FILE CHARACTERISTICS DATA ELEMENTS \*/
>
> RECORD_TYPE = FIXED_LENGTH
>
> RECORD_BYTES = NULL
>
> FILE_RECORDS = NULL
>
> /\* DATA OBJECT POINTER IDENTIFICATION ELEMENTS \*/
>
> \^ HK_TABLE = "HP-SSP-HK-M123456-R.TAB"
>
> /\* INSTRUMENT AND DETECTOR DESCRIPTIVE DATA ELEMENTS \*/
>
> FILE_NAME = "HP-SSP-HK-M123456-R.LBL"
>
> DATA_SET_ID = HP-STI-SSP-3/4-DESCENT-V1.0
>
> DATA_SET_NAME = "HUYGENS DESCENT RAW AND CALIBRATED DATA V1.0"
>
> PRODUCT_ID = "HP-SSP-HK-M123456-R.LBL"
>
> PRODUCT_CREATION_TIME = 2001-12-24T00:00:00
>
> MISSION_NAME = "CASSINI-HUYGENS"
>
> INSTRUMENT_HOST_NAME = "HUYGENS PROBE"
>
> INSTRUMENT_HOST_ID = HP
>
> MISSION_PHASE_NAME = "ALL MODES --1 to 6"
>
> PRODUCT_TYPE = EDR /\* EDR for RAW, RDR for calibrated data, TBC \*/
>
> START_TIME = NULL /\* in UTC, e.g. 2004-11-12T00:00:00.000Z \*/
>
> STOP_TIME = NULL
>
> SPACECRAFT_CLOCK_T0_START_TIME = NULL /\* seconds.milliseconds \*/
>
> SPACECRAFT_CLOCK_STOP\_ T0_TIME = NULL
>
> PRODUCER_ID = "HP-SSP-OU"
>
> PRODUCER_FULL_NAME = "BRIJEN HATHI"
>
> PRODUCER_INSTITUTION_NAME = "OPEN UNIVERSITY, PSSRI"
>
> TARGET_NAME = "TITAN"
>
> /\* INSTRUMENT DESCRIPTION \*/
>
> INSTRUMENT_ID = "SSP"
>
> INSTRUMENT_NAME = "SURFACE SCIENCE PACKAGE"
>
> INSTRUMENT_TYPE = NULL /\* SEE TABLE BELOW \*/
>
> DATA_QUALITY_ID = NULL /\* NEEDS DEFINITION IN_QUALITY.CAT, SEE TABLE
> BELOW \*/
>
> INSTRUMENT_MODE_ID = MODE123456 /\* NEEDS DEFINITION IN SSP_MODES.CAT
> \*/
>
> /\* DATA OBJECT DEFINITION \*/

The following table gives the used values for the keyword
INSTRUMENT_TYPE:

  ----------------------------------- -----------------------------------
  **Sensor**                          INSTRUMENT_TYPE

  ACCE                                PENETRATOR (TO BE ADDED TO
                                      DICTIONARY)

  ACC-I                               ACCELEROMETER

  API-V                               ACOUSTIC SENSOR

  API-S                               ACOUSTIC SENSOR

  DEN                                 DENSITOMETER (TO BE ADDED TO
                                      DICTIONARY)

  PER                                 PERMITTIVITY SENSOR (TO BE ADDED TO
                                      DICT)

  REF                                 REFRACTOMETER (TO BE ADDED TO DICT)

  THP                                 THERMAL PROPERTIES SENSOR (TO BE
                                      ADDED TO DICT)

  TIL                                 TILTMETER (TO BE ADDED TO DICT)

  HK                                  REFERENCE DATA (TBC)

  STATUS                              REFERENCE DATA
  ----------------------------------- -----------------------------------

The following table gives the definition of the data_quality_flag: (TBW)

  ----------------------- ----------------------- -----------------------
  DATA QUALITY FLAG       RAW DATA                CALIBRATED DATA

                                                  

                                                  

                                                  
  ----------------------- ----------------------- -----------------------

### Data Product Design - ACCE Sensor

This section contains detailed information on the layout and
presentation of each of the SSP data sets.

#### Data Object Definition ACCE_MODE5_TABLE

The ACCE data packets consist of one time-tagged time series of 512
values that represent the ACCE impact event. The data is represented as
time (s), ACCE measurements (raw ADC counts), ACCE (V).

The third column ACCE(V) is directly reduced from the digital numbers
(raw ADC counts) by:

Voltage = DN / 256.0 \* (VOLTAGE_MAX -- VOLTAGE-MIN), with VOLTAGE_MAX
=+5V and

VOLTAGE_MIN=0 V .

#### Data Object Definition ACCE_MODE123_DN_SERIES

The ACCE_MODE123_DN_SERIES is used for the data acquired during
instrument modes 1, 2 and 3. There are 3 time series in total that will
be archived in one file. The length of each time series is 110 values.

#### Data Object Definition ACCE Calibrated Data

N/A -- As with all SSP calibrated data, the results will be available in
some form of a publication.

### Data Product Design - ACCI Sensor

#### Data Product Design of ACCI Sensor ACCI-MODE5_TABLE

> The ACCI data packets consist of one time-tagged time series of 512
> values that represent the ACCI impact event. The data is represented
> as time (s), ACCI measurements (raw ADC counts), ACCI (V).

The third column ACCI(V) is directly reduced from the digital numbers
(raw ADC counts) by:

Voltage = DN / 4096 \* (VOLTAGE_MAX -- VOLTAGE-MIN), with VOLTAGE_MAX =
+5V and

VOLTAGE_MIN= -5 V.

#### Data Product Design of ACCI_MODE1236_TABLE

> The ACCI sensor is sampled continuously at 500Hz through the mission.
> One set of values in these data packets consist of Mean, Variance, and
> Maximum values taken over 200 ACCI samples . The data is represented
> by 7 columns as: TIME (s), ACCI_MEAN (raw ADC counts), ACCI_MEAN (V),
> ACCI_VAR (raw ADC counts), ACCI_VAR (V), ACCI_MAX (raw ADC counts),
> ACCI_MAX (V).

The voltages ACCI (V) values are reduced from the digital numbers (raw
ADC counts) by:

Voltage = DN / 4096 \* (VOLTAGE_MAX -- VOLTAGE-MIN), with VOLTAGE_MAX =
+5V and

VOLTAGE_MIN= -5 V.

### Data Product Design - APIS Sensor

#### Data Product Design of APIS_MODE23_TABLE

> The APIS sensor operates from mode2 to the end of mission. The
> acoustic return signal is formed by 1000 samples measured at 1
> millisecond interval. In modes 2 and 3, the data is reduced by
> selecting a window from the1000 sample acoustic return signal 40^th^
> sample to 560^th^ sample and sending an average of 20 samples as 1
> value (called bin). Therefore one return signal is represented by 26
> such bins.
>
> The data is represented by 4 columns as: time (s), bin number, APIS
> (raw ADC counts), APIS (V).

The third column ACCI(V) is directly reduced from the digital numbers
(raw ADC counts) by:

#### Data Product Design of APIS_MODE4_TABLE

> The APIS sensor operates from mode2 to the end of mission. The
> acoustic return signal is formed by 1000 samples measured at 1
> millisecond interval. In mode 4, the data is reduced by transmitting
> the 60 samples around the peak as uncompressed, and further 140
> samples are averaged by 4 with remaining samples averaged by 20.
> Therefore one return signal is represented by 136 such bins.
>
> The data is represented by 5 columns as: time (s), bin number, APIS
> (raw ADC counts), APIS (V), APIS_PEAK_POS.

#### Data Product Design of APIS_MODE6_TABLE

> The APIS sensor operates from mode2 to the end of mission. The
> acoustic return signal is formed by 1000 samples measured at 1
> millisecond interval, in surface mode (6), the sensor output is taken
> from 10 pulses separated by 1 second listening interval. In mode 6,
> the data is reduced by transmitting 10x50 bins (where each bin
> contains average value of 20 samples) = 500 bins and also the highest
> return signal is transmitted as mode4 (i.e. compression centred on the
> peak).
>
> The data is represented by 5 columns as: time (s), bin number, APIS
> (raw ADC counts), APIS (V), APIS_PEAK_POS.

### Data Product Design - APIV Sensor

#### Data Product Design of APIV_MODE123456_TABLE

> The APIV sensor is sampled at 1Hz through the mission. One set of
> values in these data packets consist of two speed of sound
> measurements (APIV1 and APIV2). The data is represented by 4 columns
> as: TIME (s), APIV_MEAN (raw ADC counts), APIV1 (raw ADC counts),
> APIV2 (raw ADC counts).

### Data Product Design of DEN Sensor

#### Data Product Design of DEN_MODE123456_TABLE

The DEN sensor is sampled at 1Hz through the mission and the data is
acquired by a 12 bit A/D converter with +5V to --5V range. The data is
represented by 3 columns as: TIME (s), DEN (raw ADC counts), and DEN
(V).

The voltages, DEN (V) values are reduced from the digital numbers (raw
ADC counts) by:

Voltage = DN / 4096 \* (VOLTAGE_MAX -- VOLTAGE-MIN), with VOLTAGE_MAX =
+5V and

VOLTAGE_MIN= -5 V.

### Data Product Design of TIL Sensor

#### Data Product Design of TIL_MODE123456_TABLE

The TIL sensor is sampled at 1Hz during the descent phase (i.e. all
atmosphere modes) and at 2 Hz post landing (surface modes). The data is
acquired by a 12 bit A/D converter with +5V to --5V range. and is
represented by 2 tables. The first table contains 9 columns : TIME (s),
TILXH(raw ADC counts), TILXH(V) , TILXL(raw ADC counts), TILXL(V),
TILYH(raw ADC counts), TILYH(V), TILYL(raw ADC counts), and TILYL(V).

The second table contains the values of TIL sensor's input voltages and
offsets as a function of time. These values are transmitted in the SSP
housekeeping packet. The columns are; TIME (s), TOPXH(raw ADC counts),
TOPXH(V) , TOPXL(raw ADC counts), TOPXL(V) , TOPYH(raw ADC counts),
TOPYH(V) , TOPYL(raw ADC counts), TOPYL(V), TLXO(raw ADC counts), TLXO
(V), TLYO(raw ADC counts), TLYO (V), TOPXO(raw ADC counts), TOPXO (V),
TOPYO(raw ADC counts), and TOPYO (V).

### Data Product Design of PER Sensor

#### Data Product Design of PER_MODE123456_TABLE

The PER sensor is sampled at 0.1Hz during the mission (i.e. all modes).
The data is acquired by a 12 bit A/D converter with +5V to --5V range.
and is represented by 2 tables. The first table contains 5 columns :
TIME (s), PER(raw ADC counts), PER(V) , CON(raw ADC counts), and CON(V).

The second table contains the values of PER sensor's offsets and
temperatures a function of time. These values are transmitted in the SSP
housekeeping packet. The columns are; TIME (s), PEROFF(raw ADC counts),
PEROFF(V) , CONOFF(raw ADC counts), CONOFF(V) , PERT(raw ADC counts),
and PERT(V).

### Data Product Design of REF Sensor

#### Data Product Design of REF_MODE123456_TABLE

The REF sensor is sampled at 0.005Hz (or every 3 minutes) during modes
2, 3, 5, and 6 and sampled only once during mode 4. The data is acquired
by an 8 bit A/D converter with 0V to 5V range and is represented by 3
tables containing data for REF Internal, external and dark (or
background) illuminations. Each table contains four columns: TIME (s),
PIXEL_NUM, PIXEL_INTENSITY (Raw ADC counts), PIXEL_INTENSITY (V). In
addition, the temperature data is available in a separate file.

### Data Product Design of THP Sensor

#### Data Product Design of THP_MODE123456_TABLE

The THP sensor is sampled at approximately 0.016Hz (or every 1 minute)
during modes 2, 3, 4, and 6. The data is acquired by a 16-bit A/D
converter with -5V to +5V range and is represented by 4 tables
containing data for each of the four THP subsystems. Each table contains
6 columns: TIME (s), SAMPLE_NO (1 to 60 samples), THP_OUTPUT (Raw ADC
counts), THP (V), THP_INITIAL_TEMP (Raw ADC counts), THP_INITIAL_TEMP
(V). In addition, the housekeeping temperature data is available in a
separate file.

# Appendix 1: Available Software to read PDS files {#appendix-1-available-software-to-read-pds-files .Appendix1}

No software is to be archived, as all data is in ASCII format. Data
processing / further interpretation is beyond the scope of this
document.

# Appendix 2: Auxiliary Data Usage {#appendix-2-auxiliary-data-usage .Appendix1}

TBD

# Appendix 3: Example of Directory Listing of Data Set X {#appendix-3-example-of-directory-listing-of-data-set-x .Appendix1}

TBD? Is this required?.

#  {#section .Appendix1}