Portable Broadband Seismology

1
Portable Broadband Seismology
Part 3 Data Acquisition System Overview

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

2
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

3
Q330 Data Engine
QUANTERRA

4
Overview of Q330 features

• 24-bit A/D
• 3 or 6 channels (sensor ports AB)
• 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

5
Q330 Hardware Block Diagram
6
Q330 Design Philosophy
7
Old Fashioned Hub-and-Spoke
Users
8
Quanterra Multiple Connectivity
9
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.

10
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

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Baler 14
QUANTERRA

12
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

13
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 (lt1ms/day)

14
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 lt5µsec
  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.

15
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

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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

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Typical Timing CycleLCE LCQ channels
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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)
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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
20
Typical Portable DeploymentAnd 1W Power
Consumption (not including sensors)
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IP Telemetry Deployment
VSAT Terminal
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USArray TA Standard Site
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USArray TA Standard Site
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GSN II Proposed Configuration
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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