7807 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 RovNav Mk4 LBL Transceiver (Discontinued)
Description
Sonardyne's RovNav Mk4 is an underwater Long BaseLine (LBL) acoustic transceiver designed to accurately and rapidly position Remotely Operated Vehicle's (ROV's) and towfish. By measuring ranges to a seabed transponder array and calculating the time taken to receive each reply, the position of the mobile relative to the array can be determined. A digital link with the survey computer ensures fast position updates and that reliable communications with the RovNav can be maintained even down long umbilical in deepwater. RovNav features a 121 channel receiver for ranging to LBL transponder arrays and the command set is Sonardyne PAN compatible. Two transducers can be connected to the RovNav for added redundancy or sequential position fixing. In the event of power failure, the unit automatically reverts to transponder mode to enable the emergency relocation of the lost ROV or towfish. Depending on the positioning accuracy and range required, RovNav is available in three frequency versions. Medium Frequency (16-36kHz) gives ranges of up to 3km and a relative positioning accuracy of ±0.15m. Extra High Frequency (50-110kHz) gives ranges to 1km with relative positioning accuracies of ±0.05m whilst Low Frequency (8-16kHz) can range up to 10km. Note: All ranges are dependant upon on local operating conditions and water depth. Key Features
- Depth rated up to 4,000 Metres (MF)
- Baseline measurements <5cm (EHF)
- 12 channel receiver for fast position updates
- RS 232/RS485 half duplex communications via ROV's umbilical
- Two remote transducers enable sequential position fixing
- Compact and rugged design
- Incorporates depth, temperature and salinity sensors (optional)
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 Specification RovNav Mk4 LBL Transceiver (Discontinued) Feature Type 7807 Type 7808 Depth Rating 4,000 Metres 2,500 Metres Operating Frequency MF (18-36kHz) EHF (50-110kHZ) Transducer Beam Shape Directional or Omni-Directional Omni-Directional Typical Accuracy 0.15-1 Metres 0.02-0.15 Metres Source Level Vertical 200db re 1 µPa @1m 190db re 1 µPa @1m Source Level Horizontal 185dB re 1 µPa @1m 190db re 1 µPa @1m Receiver Threshold <95dB re 1 µPa <100dB re 1 µPa Pulse Length 4ms 1ms Number of Replies (Battery Option) 200 X 10 ³ 750 X 10³ Mechanical Construction Aluminium Alloy Hard Anodised Aluminium Alloy Hard Anodised Weight in Air RovNav Remote Tdr 15kg 4.5kg 15kg 4.5kg Weight in Water RovNav Remote Tdr 6.6kg 2.5kg 6.6kg 2.5kg Sensor Options Depth Temperature Salinity Digiquartz or Strain Gauge PRT Conductivity