7842 SONARDYNE | Alldatasheet
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Sonardyne UK (Head Office) T. +44 (0) 1252 872288 F. +44 (0) 1252 876100 E. sales@sonardyne.com www.sonardyne.com Datasheet Mini RovNav LBL Transceiver
Description
Mini RovNav is a compact, remote acoustic transceiver designed to accurately position deepwater, mobile targets such as ROVs and towfish. The Type 7842 is a Medium Frequency (18-36 kHz) version which gives ranges up to 3kms and a positioning accuracy of ±0.15m. The Type 7860 Extra High Frequency (50-110 kHz) Mini RovNav enables relative positioning of accuracies ±0.05m to be achieved with acoustic ranges of up to 1km. Working within a Long BaseLine array, Mini RovNav measures ranges to seabed transponders. Together with depth information, this data is digitally transmitted to the surface and combined with survey software to determine the position of the mobile relative to the array. The digital link (RS232 or RS485 full or half duplex) ensures that reliable communications with the Mini RovNav can be maintained despite the use of increasingly long umbilical. Mini RovNav is compatible with all compatt commands thus allowing a relative calibration of a seabed array from the remote vehicle without the need for direct ranging or telemetry to the surface vessel. This enables high accuracy, short range EHF equipment to be used in deepwater. When used with a Sonardyne USBL system, the Mini RovNav can be configured as a USBL Responder or as a LBL transceiver to provide a complete acoustic positioning solution. Key features (Type 7842)
- Depth rated to 4,000 metres
- Provides ranges up to 3km and positioning accuracy of ±0.15m
- Sonardyne LBL and LUSBL compatible
- RS232/ RS485 full or half duplex interface for fast position updates
- Compact and rugged design Key features (Type 7860)
- Type 7860 EHF Mini RovNav
- Depth rated to 2,000 metres
- Provides ranges up to 1km and positioning accuracy of ±0.05m
- Enables high accuracy LBL equipment to be used in deepwater
- Integral depth and temperature sensors
- Powered from ROV's umbilical
Sonardyne UK (Head Office) T. +44 (0) 1252 872288 F. +44 (0) 1252 876100 E. sales@sonardyne.com www.sonardyne.com Specifications subject to change without notice - 10/2006 Specifications Mini RovNav LBL Transponder Feature Type 7842 Type 7860 Depth Rating 4,000 Metres 2,000 Metres Operating Frequency MF (18-36kHz) EHF (50-110 kHz) Transducer Beamshape Omni-Directional Omni-Directional Transmit Source level (dB re 1µPa @1m) 190±4dB (High Power Mode) 190±sdB (High Power Mode) Receive Sensitivity (dB re 1µPa) <96dB <100dB Pulse Length 4ms 1ms Range Resolution 0.1ms 0.01ms Depth Sensor Options 500m, 2000m, 4000m 500m , 2000m Depth Measurement: Resolution Accuracy @ 4ºC 0.2% Full Range Output ±8m@4000m 0.2% Full Range Output ±4m@2000m Temperature Measurement Resolution Accuracy 0.01ºC 0.1ºC 0.01ºC 0.1ºC Power Supply External Via ROV Umbi lical External Via ROV Umbilical Power Consumption 2 Watt between 18 – 72V 2 Watt between 18 – 72V Dimensions (LxDia) 485mm (19.0”) X 95mm (3.7”) 518mm (20.3”) X 95mm (3.7”) Connector Types 8 pin AGP Plug, Type AGP-2608-F 8 pin AGP Plug, Type AGP-2608-F Mechanical Construction Aluminium Alloy Hard Anodised Aluminium Alloy Hard Anodised Weight in Air 5.5kg 6kg Options Noise Shield with remote transduc er Noise Shield with remote transducer