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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. Modern Seismic Technology. Inter-networked Digital Communications

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portable broadband seismology

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

modern seismic technology
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
overview of q330 features
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
data port concept
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
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
overview of baler14
Overview of Baler14
  • Power cycled DP & data storage unit (19GB)
  • Demultiplexes Q330 packets and writes 4096Kb miniSEED files
  • 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
q330 timing clocks
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)
q330 timing clocks1
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
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:
baler and miniseed
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
soh 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)
overview of application deployments
Overview of Application deployments

Stand Alone: QNET-QNET-80

Stand Alone + Telemetry

Types of Telemetry


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



KMI tech team


reference materials


Inter-Program, Quanterra Users Group


BRTT - Antelope (commercial)

ISTI - Mountainaire (open source)

PASSCAL - hocus (open source)

User Documentation

PASSCAL - www.passcal.nmt.edu