# Presentation: 111070

## NPOESS Preparatory Project (NPP)

**Status Update for **
**Interim Science Panel**
**August 2, 1999**

- R. Taylor
- NASA
- M. Crison
- IPO

## Purpose of Presentation (for RSDO only)

**Provide updated status information to industry regarding NPP mission status and planning**
**Provide preliminary technical information on mission**
**Note:  Decision on NPP spacecraft acquisition approach to be made jointly by NASA and IPO**
**Depends in part on outcome of RAPID II procurement**
**Note:  Feasibility Study information is provided for information only.  Formulation Study work, including CONOPS and Level-2 Requirements work, may change mission technical information from Feasibility Study.**

## NPPMission Objectives

**Provide NASA with continuation of global change parameters after Terra and EOS PM**
- atmospheric temperature and humidity sounding, sea surface temperature, land and ocean biological productivity, and cloud and aerosol properties
**Provide NPOESS with pseudo-operational risk-reduction demonstration and validation for 3 of the 4 critical NPOESS instruments and algorithms**
- VIIRS, CrIS, ATMS

**Joint NASA/IPO flight of critical imager and sounding systems**

## NPPPreliminary Mission Concept

_**Accommodate Instruments:**_
- Visible Infrared Imaging Radiometer Suite (VIIRS)
- Cross-track Infrared Sounder (CrIS)
- Advanced Technology Microwave Sounder (ATMS)
_**Launch:**_**  12 / 2005**
_**Duration:**_**  5 years (consumables for 7.5 years, instruments designed for 7 year on-orbit life with 7 year shelf life)**
_**Orbit:**_**  833 +/- 17 km polar sun-synchronous, 10:30 a.m. +/- 10 minute nodal crossing time, descending**
_**Ground Track Repeat:**_**  +/- 20 km, repeat cycle less than 20 days**
_**Stored Mission Data Return**_**:  Direct-to-ground to polar ground stations**
_**Performance**_**:  Environmental Data Record (EDR) delivery within 3 hours of acquisition (goal)**
_**Direct Broadcast:**_**  Real-time X-band direct broadcast of all instrument data **
_**Pixel Geo-location Knowledge:**_**  200m, 3 sigma, at nadir (post-processed)**
_**Calibration Maneuver:**_**  Attitude slew for deep space and lunar views by VIIRS**
_**Primary Telemetry and Command:**_**  unified S-band via NOAA Command and Data Acquisition (CDA) sites**
_**Backup Telemetry and Command:**_**  unified S-band via NOAA CDA, selected AFSCN, and/or TDRSS**
_**Science Processing**_**:   Provide science products to the global change community (GCC)**
_**Autonomy:**_**  Ground contact once per day, goal of once per week; independent safe mode controller**
_**End-of-Life Disposal:**_**  Via propulsion maneuver (TBR)**

## Satellite Transition Schedule

## NPP Contributions to 24 NASA Measurements

**Primary source for 11 of 24 measurements**
**Secondary source for 2 of 24 measurements**
**VIIRS contributes to:**
- 4 (3 Primary)		Atmosphere Measurements
- 6 (4 Primary)		Land/Cryosphere Measurements
- 3 (2 Primary)		Ocean/Cryosphere Measurements
**CrIS/ATMS contributes to:**
- 4 (2 Primary)		Atmosphere Measurements
- 1 			Ocean/Cryosphere Measurements

## NPP Contributions to NPOESS

**Sensor Risk Reduction**
- Early delivery, sensor-level tests, and system-level integration & test
- Provides lessons learned and allows for any required modifications in time to support C1 launch readiness
**Ground System Risk Reduction**
- Early delivery and pseudo-operational test of NPOESS ground system architecture and components
**Early user evaluation of NPOESS data products**
- Provides algorithm/sensor verification and opportunities for sensor calibration / validation
- VIIRS makes primary contributions to 26 of 61 EDRs
- CrIS/ATMS makes primary contributions to 3 of 61 EDRs
- Allows for algorithm modifications prior to C1 launch
- Provides opportunities for pseudo operational utilization/ demonstration of NPOESS imager and sounder data products

## NPP

***Draft Initial Implementation Agreement (IIA)***

**NASA Responsibilities**
- Joint program management responsibilities with IPO
- Mission systems engineering, integration, and test
- Launch vehicle and launch activities
- Spacecraft and space segment integration
- ATMS development and first unit
- Selected ground system capabilities
- Rate buffers for ground stations, back-up command & control via TDRSS, make available to IPO and/or NOAA any science processing/re-processing capabilities developed by NASA for NPP.  Note that long-term archive functions are under discussion with NOAA.
- Participate with IPO and NOAA in science level cal/val activities for NPP
**IPO Responsibilities**
- Joint program management responsibilities with NASA
- VIIRS development and first unit – augmented to meet NASA science requirements
- CrIS development and first unit
- Ground segments
- Stored mission data receive stations, primary and backup command & control, data retrieval and distribution, prototype operational data processing, prototype operational cal/val
- Ground segment integration
- Mission operations (after launch and early orbit checkout by NASA)

## NPP Status

**Agreement between NASA HQ and IPO to study feasibility**
- GSFC led concept study with IPO participation
- Determined mission feasible
- Determined ATMS feasible
**Results of feasibility study presented to Dr. Asrar and Mr. Winokur on April 8, 1999**
- Agreement in principle to proceed with next phase (Phase I/Phase B/Mission Formulation Phase)
- Concurrence with proposed division of responsibility and augmentation of VIIRS (pending concurrence of EXCOM)

## NPP Status (Cont’d)

**NPP Initial Implementation Agreement (IIA) for mission formulation in signature cycle**
- Defines top-level NPP acquisition strategy through NASA / IPO work split
- IIA for ATMS already signed
**Draft NPP Formulation Plan in review by NASA HQ, GSFC, and IPO**
**Initiated NPP mission systems engineering concept of operations (CONOPS) and Level 2 requirements development jointly with IPO**
**Issued draft ATMS Formulation Phase RFP to industry for comment after NASA HQ and IPO concurrence**

## NPP Status (Cont’d)

**IPO VIIRS and CrIS acquisitions on schedule**
- Revision to VIIRS Sensor Requirements Document (SRD) to incorporate NASA science requirements approved by IPO review board
- Down-select of CrIS on schedule for August 1999
**Initiated NASA-IPO NPP ground station and flight operations convergence study per letter between Greg Withee and Ghassem Asrar**
- Site survey of Svalbard completed by IPO and NASA week of July 12
**NPOESS System Program and Risk Reduction (PDRR) RFP in progress**

## NPP StatusSummary

**Entered the next phase of mission definition (Phase I/Phase B/Mission Formulation Phase)**
**Offers benefits to research and operational communities**
**Calibrated, geo-located, global observations for research after EOS Terra and PM**
- Incorporate lessons-learned from EOS Terra and PM into NPP in the areas of instruments, calibration, validation, spacecraft, and ground processing
**A key benefit to operational community is early evaluation of NPOESS-like data**
- Allows for the calibration/validation of sensors & algorithms
- Facilitates the transition to using NPOESS data
**Improved NPOESS risk reduction program**

## Back-up