Transcript Document 7246139

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
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
®
QUANTERRA
Q330 Data Engine
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
Q330 Hardware Block
Diagram
DIGITAL PROCESSOR
CPU
2187L
8MByte
SRAM
ANALOG MOTHER BOARD
128kByte
EPROM
PLD
CLK
PLD
DATA
10BaseT
CS8900A
Ethernet
1.5MByte
OL-SRAM
XR16C854
QUAD
UART
1.5MByte
OL-SRAM
1MByte
FLASH
SLAVE
PROCESSOR
QAPCHP
QAPCHP
PIC
TIMING
CROSSPOINT
15.36M
TCXO
EXT
RTCM
ANT
NMEA
1PPS
3.3V SPS
M12 GPS
AUX SPI
12VUNR
RTC
CONFIG EEPROM
ID ROM
TEMP
PWR A/D
MAIN PWR CTL
AMB PWR CTL
SPI AUX I/F
SPI CALIB I/F
SPI
CALIBRATOR
AND
CONTROLLER
PIC
GAIN
GAIN
RLY
RLY
MPOS (6)
SIGNAL (2)
CONTROL (8)
ISO PWR
REF, VA, VR, VPREAMP, VCC
Q330 Design Philosophy
“Old Fashioned” Hub-andSpoke
“DUMB” DIGITIZER
NETWORK
CENTER
CONSUMERS
Users
Quanterra Multiple
Connectivity
SECONDARY
NETWORK
CENTER
AUXILIARY
COLLECTION POINT
WAVEFORM
SERVER
PRIMARY
NETWORK
CENTER
PARAMETRIC
DATA SERVER
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
®
QUANTERRA
Baler 14
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
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: 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:
time  seq _ num  sec onds _ offset  (sec_ offset /10 6 )  FIR _ delay
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
QuickTime™ and a
TIFF (Uncompressed) decompressor
are needed to see this picture.
SOH Channels
ACE
LCE
LCQ
LOG
OCF
VCO
VEA
VEC
VEP
VKI
VMU
VMV
VMW
VPB
VCO quality expressed as SEED Timing blockettes (500)
Absolute clock phase error (1 sec / count)
Clock quality times series (1 % / count)
State of health, status and timing messages
Q330 configuration expressed as SEED opaque data blockettes
VCO control voltage (150 mV / count)
GPS antenna current (1 mA / count)
System current (1 mA / count)
Input voltage (150 mV / count)
System temperature (1 C / count)
Boom position of Z or U component (100 mV / count)
Boom position of N or V component (100 mV / count)
Boom position of N or W component (100 mV / count)
Buffer usage (0.1% / count)
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)
G P S A ntenna
Baler
E X P A N S IO N
S E R IA L
QNET
P OW E R
PB14
Q330
3-Channel
GPS
SENSOR A
SENSOR B
S E R IA L
QNET
P OW E R
E X P A N S IO N
CONS OLE
Q 330
Battery Box
STS-2
Seismometer
IP Telemetry Deployment
G P S A ntenna
Baler
E X P A N S IO N
S E R IA L
QNET
P OW E R
PB14
Q330
3-Channel
VSAT
Terminal
GPS
SENSOR A
SENSOR B
S E R IA L
QNET
P OW E R
E X P A N S IO N
CONS OLE
Q 330
Battery Box
STS-2
Seismometer
USArray TA Standard Site
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