Deep-water multibeam echosounder MLE-11000
Purpose
The MLE-11 000 is designed for hydrographic surveys and seabed mapping at depths up to 11 000 m
The appearance of the devices
Objectives
- Conducting high-resolution hydrographic seabed surveys at depths of up to 11 000 m (subject to the vessel’s acoustic noise and sea state)
- Gathering side-scan and backscatter data for seabed classification
Components
Hull-mounted transmitting antenna
Hull-mounted recieving antenna
Transmission units
Analog and digital signal processing units
Operator workstation
Real-time sensor data of ship navigation, motion, and attitude are provided.
|
Antenna*
|
Dimensions, mm
|
Weight, kg
|
Beamwidth
|
|---|---|---|---|
|
Transmitting**
|
6200×1140×645
|
5914
|
1°
|
|
Receiving
|
3800×1100×52
|
2870
|
2°
|
* Antennas are installed in hull recesses, as this design provides ice protection
** A sound velocity sensor is integrated into the transmitting antenna
Technical specifications
|
Parameter
|
Value
|
|---|---|
|
Swath coverage
|
up to 120° across track
|
|
Depth resolution
|
10 – 1 000 m: up to 0.1 m
1000 – 11 000 m: 0.5% of depth |
|
Operating frequency range
|
14 – 16 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
|
2 – 20 ms
|
|
Source level
|
up to 247 dB (re 1 μPa)
|
|
Signal types
|
Continuous Wave (CW),
Frequency-Modulated (FM) |
Operating modes
- Backscatter (sidescan) mode
- Water column data
- Equidistant / equiangular beam Distribution
- Service modes: mission planning, operation monitoring, interference control, post-process
