# Presentation: 626711

## Portable Broadband Seismology

- Jakarta, Indonesia
- May 11-13, 2006
- Bruce Beaudoin
- Marcos Alvarez
- Additional thanks to Joseph Steim for use of his slides

- Part 3: Data Acquisition System Overview

**Notes:**
Introduction to the Q330

## Modern Seismic Technology

- Inter-networked Digital Communications
- Robust Multiple Telemetry Paths
- Central Administration and Data Collection
- Rapid, Reliable Reporting of Information for Disaster Mitigation.
- High Dynamic Range
- Portable, Lightweight, Easy to Use

## Q330 Data Engine

- ®

- QUANTERRA

## Overview of Q330 features 

- 24-bit A/D
- 3 or 6 channels (sensor ports A&B)
- Average power requirement of about 1W, including a power-cycled recorder
- Internal GPS engine with external antenna
- VCO is frequency-adjusted to GPS phase lock loop
- Samples & sends multiplexed, time-stamped UDP packets to a Data Processor (DP) through one of 4 logical data ports:
- 1,2 - serial or Ethernet telemetry
- 3 - SOH check by local operator
- 4 - Baler
- Also 1 control port for programming/commands (Willard)
- Communicates by UDP/IP
- Web server (provides links to DP webserver)
- Digitizes sensor and SOH streams

**Notes:**
3 – 6 channels, can record two instruments in one DAS

Timing with GPS

## Q330 Hardware Block Diagram

**Notes:**
The datalogger is basically a PC

## Q330 Design Philosophy

**Notes:**
The Q330 can be used in 3 different ways.

Record directly to the instrument
Record to a local disk drive
Do both 1 and 2

## “Old Fashioned” Hub-and-Spoke

- Users

## Quanterra Multiple Connectivity

**Notes:**
Many users can collect data from the instruments

## Data Port Concept

- Four ports are available
- Each Data Port is an independent collection of channels and sample rates
- Each Data Port can use its own SEED channel names or even Station Code
- Connection to a Data Port is by IP socket, multiple Data Ports can use the same interface, e.g. ethernet or Serial.

## Q330 - Network friendly

- Friendly to Automated Processing. Pure IP
- Friendly to Remote Maintenance, Configuration, and Network Management
- Intra and Internet-Ready Security
- Simple Field and Data Center Management and Setup Procedures, analogous to IP itself
- Based on modern IP model, not a “dumb” device, e.g. connected through a serial link

## Baler 14

- ®

- QUANTERRA

**Notes:**
The disk drive that records data from the Q330

## Overview of Baler14

- Power cycled DP & data storage unit (19GB)
- Demultiplexes Q330 packets and writes 4096Kb miniSEED files
- MS DOS OS
- Web server
- File transfer by http (10baseT)
- Q330 manages Baler:
- Assigns IP address
- Passes recording parameters
- Manages most power cycling
- Runs in acquisition (power cycled) or vacuum (download/continuously powered) modes

**Notes:**
It is PC it formats and writes the data coming from the Q330

## Q330 Timing: Clocks

- Internal Clocks
- Time of day clock - keeps rough time when Q330 power is off. Runs on an internal battery.
- Temperature Compensated Voltage Controled Crystal Oscillator (TCVCXO)
- Nominal drift of 0.1ppm (<1ms/day)

**Notes:**
Timing is very important. 
2 clocks – 1) keeps a rough time, whether the power is on or off (like a wrist watch)
		2) keeps very accurate time, when connect to the GPS and a power supply

## Q330 Timing: Clocks

- External Clock
- Q330 has a Motorola M12 GPS engine on-board
- Default is to power up every 3 hours
- Adjusts TCVCXO oscillation rate to reduce phase error between GPS 1Hz pulse and TCVCXO 1Hz
- Stays powered up until phase difference of <5μsec is maintained for 1 minute before powering off the GPS
- The Q330 retains the last measured phase error before turning off the GPS and applies this constant time correction to all records acquired will GPS is off/unlocked.

## Q330 Timing: Time Stamps

- Data is packaged into 1 second data records that are sent to a data processor (DP)
- Each record includes a time stamp consisting of:
- Sequence number ≈ seconds since last power-up
- Seconds of offset since January 1, 2000 of last power-up
- μsec offset from the current second
- Q330 also sends
- A clock status bitmap
- Minutes since GPS lock was lost
- Clock phase loop status
- The baler (DP) queries the Q330 for FIR filter delays and construct the time stamp for the data records using:

**Notes:**
Equation at the bottom is used to put the actual time onto the data

## Baler and miniseed

- Once the baler has calculated the time stamp for the data packets it creates 4096 byte miniseed files.
- The baler uses the best timed 1sec data packet to extrapolate the time for the first sample in a miniseed record
- The baler also determines a clock quality parameter and writes it to the miniseed header
- 100% = clock is LOCKED
- 90% = clock is TRACKING, 3D fix and adjusting TCVCXO
- 80% = GPS just powered up
- 10-60% = HOLD, GPS is off. Quality decreases by 1% every 10 minutes
- 0% - GPS clock has not locked since Q330 power up

## Typical Timing CycleLCE & LCQ channels

## SOH Channels

- ACE	VCO quality expressed as SEED Timing blockettes (500)
- LCE 	Absolute clock phase error (1 sec / count)
- LCQ 	Clock quality times series (1 % / count)
- LOG	State of health, status and timing messages
- OCF	Q330 configuration expressed as SEED opaque data blockettes
- VCO	VCO control voltage (150 mV / count)
- VEA	GPS antenna current (1 mA / count)
- VEC	System current (1 mA / count)
- VEP	Input voltage (150 mV / count)
- VKI	System temperature (1 C / count)
- VMU	Boom position of Z or U component (100 mV / count)
- VMV	Boom position of N or V component (100 mV / count)
- VMW	Boom position of N or W component (100 mV / count)
- VPB	Buffer usage (0.1% / count)

**Notes:**
SOH = state of Health – i.e. information on how the instrument is preforming.

## Overview of Application deployments 

- Stand Alone: QNET-QNET-80
-      Stand Alone + Telemetry
- 	Types of Telemetry
- 		LAN
- 		Ethernet Bridge to LAN
- 		IP VSAT (Hughes, Spacenet)
- 		GSM or CDMA Cellular
- 	Serial Q330 to Baler & Ethernet Telemetry: cabling & configuration
- 	Ethernet Q330 to Baler & Serial Telemetry: cabling & configuration
- 	Configuring, Accessing, and Monitoring

## Typical Portable DeploymentAnd ~ 1W Power Consumption (not including sensors)

**Notes:**
Stand-alone deployment

## IP Telemetry Deployment

- VSAT
- Terminal

**Notes:**
Internet deployment (in this case using a satellite connection)

## USArray TA Standard Site

**Notes:**
Transmit the data with a radio back to a place where the internet is available

## USArray TA Standard Site

## GSN II Proposed Configuration

## Resources

-   Quanterra
-   KMI tech team
-   www.q330.com
- 	reference materials
- 	updates
-   Inter-Program, Quanterra Users Group
-   Development
- 	BRTT - Antelope (commercial)
- 	ISTI - Mountainaire (open source)
- 	PASSCAL - hocus (open source)
- User Documentation
- 	PASSCAL - www.passcal.nmt.edu