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© GeoAcoustics
2008

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GeoChirp 3D Specifications
True 3-D Chirp Profiling System

Deck Unit
General
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Power requirements: |
95-265VAC universal
input, 40-60Hz, 500W, optional 24VDC |
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Size: |
42.8cm W x
48.8cm D x 27.5cm H |
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Weight: |
23.5kg |
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Temperature: |
Storage: -20
to 75°C
Operating: -5 to 50°C |
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Humidity: |
10% to 95% RH,
non-condensing |
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Mounting: |
The unit is suitable
for either bench or rack mounting. |
Tow Cable
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Analogue differential or Gigabit Ethernet |
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Cable length:
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30m |
Rear Panel Connectors
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BNC: |
1PPS key |
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RS232/422: |
Six each for GPS/time/magnetometer etc |
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Tow cable: |
Two each MS3102A-22-34S for deck cable |
Tow Platform
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Tow speed: |
1
to 6 knots |
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Weight in air: |
176kg |
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Weight in water: |
Neutrally buoyant |
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Dimension: |
0.5m H by 2.5m W by 2.2m L, 4 GPS aerials protrude 1.5 m at corners |
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Construction: |
Custom GRP sections, PVC and polyurethane foams and stainless steel |
Chirp
Transmitter Pressure Vessel
Transmitter Section
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Standard High Power GeoChirp II |
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Frequency Range: |
1.5kHz to >13kHz programmable |
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Power Output: |
10W to >4kW user programmable |
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Source Level: |
205dB
±3dB
re 1uPa@1m |
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Pulse Length: |
Typically 32ms, programmable |
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Pulse Shading: |
Full amplitude control |
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Pulse Repetition Rate: |
8
pulses per second maximum |
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Protection: |
Open and short circuit protected |
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Efficiency: |
Greater than 90% |
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Beamwidth: |
30 to 90 degrees over sweep |
Receive Hydrophone Sections
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Frequency Range: |
200Hz to 25kHz |
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Filter Type: |
High/Low pass 4th order linear phase |
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Sensitivity: |
-205dB
±3dB
re 1V/uPa |
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Output: |
Differential signal |
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Gain: |
x
8 |
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Noise: |
<3nV/√Hz |
Timing
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GPS 1PPS resolution: |
20us |
Positioning
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Position Accuracy: |
5cm RMS x,y 10cm RMS z |
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Heading Accuracy: |
±0.2 degree RMS |
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Heading Resolution: |
0.01 degree |
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Roll/Pitch Accuracy: |
±0.4 degree RMS |
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Roll/Pitch Resolution: |
0.01 degree |
Magnetometer Interface
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Power: |
24VDC @ up to 10A |
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Interface: |
RS232 |
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Baud Rate: |
Up
to 38.4 kbits/sec |
Digital Acquisition
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Number of channels: |
60 (expandable) |
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Sample Rate: |
250kHz maximum per channel |
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Sampling: |
Simultaneous all channels |
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Resolution: |
16 bit raw signal |
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Processing Gain: |
>25dB |
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Processing: |
Correlation (de-chirping) filtering and 3-D migration |
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Single Channel “Slices” |
Real time |
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3D Volumes: |
Near real time |
Specifications subject to change
without notice.
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