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GeoChirp 3D Specifications
True 3-D Chirp Profiling System

Deck Unit

 

General

Power requirements:

95-265VAC universal input, 40-60Hz, 500W, optional 24VDC

Size:

42.8cm W x 48.8cm D x 27.5cm H

Weight:

23.5kg

Temperature:

Storage: -20 to 75°C

Operating: -5 to 50°C

Humidity:

10% to 95% RH, non-condensing

Mounting:

The unit is suitable for either bench or rack mounting.

 

Tow Cable

Analogue differential or Gigabit Ethernet

Cable length:

30m

 

Rear Panel Connectors

BNC:

1PPS key

RS232/422:

Six each for GPS/time/magnetometer etc

Tow cable:

Two each MS3102A-22-34S for deck cable

 

Tow Platform

Tow speed:

1 to 6 knots

Weight in air:

176kg

Weight in water:

Neutrally buoyant

Dimension:

0.5m H by 2.5m W by 2.2m L, 4 GPS aerials protrude 1.5 m at corners

Construction:

Custom GRP sections, PVC and polyurethane foams and stainless steel

 

Chirp Transmitter Pressure Vessel

 

Transmitter Section

Standard High Power GeoChirp II

 

Frequency Range:

1.5kHz to >13kHz programmable

Power Output:

10W to >4kW user programmable

Source Level:

205dB ±3dB re 1uPa@1m

Pulse Length:

Typically 32ms, programmable

Pulse Shading:

Full amplitude control

Pulse Repetition Rate:

8 pulses per second maximum

Protection:

Open and short circuit protected

Efficiency:

Greater than 90%

Beamwidth:

30 to 90 degrees over sweep

 

Receive Hydrophone Sections

Frequency Range:

200Hz to 25kHz

Filter Type:

High/Low pass 4th order linear phase

Sensitivity:

-205dB ±3dB re 1V/uPa

Output:

Differential signal

Gain:

x 8

Noise:

<3nV/√Hz

 

Timing

GPS 1PPS resolution:

20us

 

Positioning

Position Accuracy:

5cm RMS x,y 10cm RMS z

Heading Accuracy:

±0.2 degree RMS

Heading Resolution:

0.01 degree

Roll/Pitch Accuracy:

±0.4 degree RMS

Roll/Pitch Resolution:

0.01 degree

 

Magnetometer Interface

Power:

24VDC @ up to 10A

Interface:

RS232

Baud Rate:

Up to 38.4 kbits/sec

 

Digital Acquisition

Number of channels:

60 (expandable)

Sample Rate:

250kHz maximum per channel

Sampling:

Simultaneous all channels

Resolution: 16 bit raw signal

Processing Gain:

>25dB

Processing:

Correlation (de-chirping) filtering and 3-D migration

Single Channel “Slices”

Real time

3D Volumes:

Near real time

 

Specifications subject to change without notice.

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