|
Telemetry System |
| Power Requirements: |
90–250 VAC, 50-60Hz,
500W. |
| Power output to tow
vehicle: |
350 VDC ± 3 VDC. |
| Telemetry Frequencies: |
220-236kHz (up)
430-446kHz (down) |
| Max cable length: |
10km of 11mm diameter
armoured coaxial cable. |
| Cable: |
Rochester A302799 or
equivalent. |
| Telemetry: |
High tolerance to cable
attenuation and leakage. Greater reach and far more robust than competing digital
links. |
| Safety features: |
Shutdown if greater
than 2mA leakage between screen and armour
Safety interlock. |
|
|
|
|
Telemetry Interfaces |
| Side Scan Sonar: |
DC power and signal/trigger
interface. |
| GeoChirp II: |
DC power and signal/trigger
interface. |
| Motion Sensors: |
Depth, heading, pitch,
roll. |
| Magnetometer: |
Isolated 32 VDC PSU
and RS232. |
| Posidonia USBL: |
Isolated PSU, RS232
and trigger. |
|
|
|
|
GeoChirp II |
| Max power output: |
2kW RMS max at 95%
efficiency. |
| Max power input: |
250W average at full
rep rate. |
| Pulse width: |
16 or 32ms (programmable). |
| Chirp Sweep: |
Programmable (up/down
non-linear etc). |
| Penetration: |
up to 50m, sediment
dependent. |
| Frequency range: |
1kHz to 12kHz. |
| Control: |
RS232 menu driven. |
| Rep rate: |
8 per sec at 16ms
pulse width.
4 per sec at 32ms pulse width. |
| Cable type: |
Single coax operation
(A302799). |
| Towfish: |
Standard GeoAcoustics
136 fish. |
| Transmit transducers: |
4 off 137C (600m)
or 138D (2000m). |
| Hydrophone: |
Standard chirp hydrophone
tail. |
|
|
|
|
Side Scan Sonar |
| Power requirements: |
110/240 VAC switchable
50-60Hz, 50W. |
|
|
|
|
Receiver |
| Dynamic range: |
Gain: |
adjustable over 60dB range. |
|
TVG: |
-20 to +20dB maximum. |
|
AGC: |
-34dB maximum. |
| Output: |
Selectable signal envelope
or amplitude modulated 12kHz. |
| Key out: |
0.6ms CMOS/TTL compatible. |
| Modes: |
100kHz and 500kHz operation.
Raw signal and processed signal. |
|
|
|
|
Transmitter |
| Frequency: |
114/410kHz ± 1%. |
| Power output: |
3.0kW/2.5 kW pulse
± 20%. |
| Pulse Length: |
167 m sec/88m sec ±
1%. |
| Pulse repetition rate: |
20 pulses per second
maximum. |
| Protection: |
Open and short circuit
protected. |
| Efficiency: |
Greater than 80%. |
|
|
|
|
Towfish Attitude Package |
| Heading Accuracy: |
±0.5º |
| Heading Resolution: |
0.1º |
| Pitch Accuracy: |
±0.2º |
| Pitch Resolution: |
0.1º |
| Roll Accuracy: |
±0.2º |
| Roll Resolution: |
0.1º |
| Depth Accuracy: |
±1% of full scale or
±2m |
| Depth Resolution: |
0.1 m |
|
|
|
|
Surface Equipment General |
| Temperature: |
Storage: |
-20 to 75° C |
|
Operating: |
0 to 50° C |
| Humidity: |
10% to 95% RH, non-condensing. |
| Mounting: |
All units are suitable
for either bench or rack mounting. |
|
|
|
Towfish General |
|
| Weight: |
265kg |
| Length: |
1.4m |
| Height: |
0.45m |
| Width: |
0.45m |
