The MLE-900 is designed for hydrographic surveys (seabed mapping) in shallow waters, at depths up to 900 m
Device appearance
Transceiving Antenna System
Retractable Transducer Deployment system (RTDS)
Instrument Cabinet
Objectives
Conducting high-resolution hydrographic surveys of the seabed at depths up to 900 m (depending on vessel acoustic noise and sea surface conditions)
Gathering side-scan and backscatter data for seabed classification
System composition
Retractable transceiving antenna system*
Retractable Transducer Deployment system (RTDS) with clinket closure inside the vessel shaft**
Power supply and digital processing unit (equipment cabinet)
Operator workstation
Real-time data from ship navigation, motion and attitude sensors, and sound velocity measurements are provided
* A single structure consisting of transmitting and receiving arrays with integrated sealed electronics for transmission and reception ** Optional version: over-the-side lowering unit
Technical specifications
Parameter;Value
Swath coverage;up to 120° across track
Depth (range) resolution;up to 6 cm
Operating frequency range;120 – 140 kHz
Angular resolution, at least:;across-track: 2°<br>along-track: 1°
Automatic stabilization of swath;roll up to ±15°<br>pitch up to ±10°<br>yaw up to ±5°
Number of beams (receiver);up to 512
Pulse length;50 μs – 20 ms
Source level;up to 236 dB (re 1 μPa)
Signal types;CW, FM