Bedienungsanleitung Simrad MS70 (Seite 2 von 4) (Englisch)

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System overview

The Simrad MS70 offers a new

dimension to shery research. It

provides an acoustic matrix of

stabilized and calibrated beams

for biomass estimation, sh school

characterization. and behaviour

studies.

The transducer array is normally

mounted on a drop keel, which allows

it to look horizontally. The Simrad

MS70 allows characterization and

volume estimation of a school of sh

using only one single transmission.

Schools of sh can be tracked,

followed, and studied using mulitple

consequitive transmissions.

As a consequence of the horizontal

transmission using narrow beams,

the MS70 allows you to detect and

characterize schools of sh even very

close to the sea surface.

A new dimension

The MS70 provides an acoustic

matrix of 500 beams (25 horizontal

and 20 vertical). This enables the

MS70 to provide instantaneous

3D volume data. Where

other systems need

multiple pings to provide

3D volume data, the

MS70 can provide

this using a single

ping. This allows

the MS70 to provide

more accurate data.

For example, a school

of sh can change its

structure several times

during the time other

systems need to cover the

school.

Multiple consecutive pings

enable the MS70 to provide true

4D data, where time is the fourth

dimension. This allows for improved

characterization of school structures

that are changing over time.

Low sidelobe and

interleakage levels

Low sidelobes are important for

two reasons. The obvious one is to

Key points

• The Simrad MS70 operates in

the 75 to 112 kHz frequency

range.

• The Simrad MS70 provides an

acoustic matrix containing 500

beams (25 horizontal and 20

vertical).

• Each beam is 3° to 4° wide

depending on its position in the

matrix.

• Calibration software included.

• 60° horizontal operating sector.

• 45° vertical operating sector.

• -25 dB horizontal side lobe

levels.

• -35 dB vertical side lobe levels

and beam interleakage.

System description

(CD10104G)

avoid that strong targets in side lobes

are mistaken for weak targets in the

main lobe. Secondly, you do not wish

to see strong bottom echoes from the

sidelobes. Very low vertical two-way

sidelobe levels are obtained by using

two-way side lobe suppressions. Very

low beam interleakage is obtained

by using Frequency Rotated Sector

Transmission (FRST) where the

frequency band is distributed over all

the sectors.

Data output

It is possible to set up continuous

output of all beam data. This can

be used for echo integration, school

characterization and 3D visualisation.

The output data include for example:

• non-TVG compensated sample

power and sample angle

• 20 log R compensated sample Sv

• Mean volume backscattering

strength for a user dened volume

It is also possible to output the

element data for post processing and

analysis purposes.

Calibration

A calibration utility is implemented

as a special built-in function in the

Simrad MS70 system. The sonar can

be calibrated using a reference

target located under the ship.

During the calibration

process, the MS70

automatically generate

500 split beams in order

to measure the target

position within each

beam.

Individual gain

parameters for each beam

are adjusted to provide

calibrated target strength

and volume backscattering

strength measurements.

Remote operation

Remote systems, such

as a data logger and external

post-processing systems, can

subscribe to a series of data

and parameters from the MS70.

Parameters can also be set and read

by the remote system. In this way the

communication between the MS70

and the remote system can become

an efcient, congurable, two-way

communication.

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