Multibeam echosounder for shallow water MLE-900
Purpose
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°
along-track: 1° |
|
Automatic stabilization of swath
|
roll up to ±15°
pitch up to ±10° 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
|
Operating modes
- Backscatter (sidescan) mode
- Water column data
- Equidistant / equiangular beam Distribution
- Service modes: mission planning, operation monitoring, interference control, post-processing
