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Inverted USBL, or iUSBL,
builds on the success of Sonardyne's Fusion platform and
utilises a 6,000 metre rated inverted transceiver located
on the vehicle, to offer high performance subsea positioning
for ROVs, AUVs and deep-tow bodies.
Mounting the transceiver
in this way offers many operational benefits. Installation
is simple when compared with installing a through-hull or
over-the-side USBL transceiver. Closely coupled attitude
sensors eliminate the need for repeated system calibration,
whilst the accuracy and repeatability of the acoustic signals
are improved, as the transceiver is located in a low noise,
dynamically stable environment.
Amongst the many and varied
applications for iUSBL is as an aid to AUVs needing to rendevous
with subsea docks. Mounted horizontally in the AUV's nose
cone, iUSBL can guide the vehicle precisely into position
to allow successful docking to occur. The AUV can then recharge
and download data before commencing the next mission
iUSBL Positioning
Technique
Vehicle mounted transceiver
positioning a vessel mounted transponder
Technical Specifications
| Feature
|
Type 8091 |
| Operational Frequency |
MF (18-36kHz) |
| Electrical |
+48VDC (38V to 50V), can operate on
+24VDC (18V to 30V)
Typical 15W, Max 50W |
| Communication |
RS485 or RS232, baud rate switchable |
| Transceiver Performance
Operating
Range |
Up to 7,000 Metres |
| Acoustic
Cover |
± 90º |
Range
Accuracy
|
Better that 0.2 metres |
| Positioning
Repeatability |
All transceivers tested to better than
0.1% of slant range 1 Drms |
| Dimensions (LxDia) |
613mm x 240mm |
| Weight in Air |
27.2kg |
| Weight in Water |
13.0kg |
| Depth Rating |
6,000m |
| Options |
Lightweight housing rated for 3,000
metres |
| Note |
The absolute accuracy of the system
is dependent upon the quality of attitude and heading
sensors, beacon source level, vessel (towfish / ROV)
noise, water depth, mechanical rigidity of the transceiver
mounting, accurate survey of the offset between the
transceiver acoustic face and the AHRS. |
Features
:-
- Full ocean depth rated USBL transceiver
- Can be mounted on an AUV, ROV or deep
towed body
- Incorporates Sonardyne's latest Wideband
Technology
- Non-Sonardyne frequencies supported
- No need for second vessel to position
the towfish
- Optional lightweight housing available
- 3,000 metre rated
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