Bedienungsanleitung Simrad ME70 (Seite 2 von 4) (Englisch)

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System overview

The Simrad ME70 offers

quantitative data and high operational

exibility. It provides a congurable

wide fan of stabilized and calibrated

beams for biomass estimation, sh

school characterization. and behaviour

studies.

All beams can be congured as

split beams providing data for single

target analysis, such as target strength

measurements and target tracking.

The sector of calibrated narrow

split beams with low sidelobe levels

and short pulse lengths allow for

accurate biomass estimation very

close to the bottom. The ability to

adjust the athwartship centre angle of

the fan enables you to use the system

for studying sh close to ridges and

slopes. The design also permits you

to use all the beams over the full

frequency range pointing in one

direction for frequency comparison.

Not just an ordinary

multibeam sounder

Within the bandwidth of the

transducer, the limits for beam

steering, and the minimum achievable

beam opening, you can select the

directions, frequencies, and opening

angles for the beams in the Simrad

ME70.

You will be able to congure the

system to t your requirements, and

the system will provide you with a

real-time display for quality control of

the current data acquisition.

The system conguration can be

tailored to any user requirements,

allowing for choice of beamwidths as

well as transmission modes.

Low sidelobe levels and

beam interleakage

Low sidelobes are important for

two reasons. The obvious one is to

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. Even the vertical receiver

beam may benet from low sidelobes

in case of a sloping bottom.

Very low two-way sidelobe levels

are obtained by using two-way side

lobe suppression. Very low beam

interleakage is obtained by using

Frequency Rotated Directional

Transmission (FRDT) where the

frequency band is distributed over all

the beams.

Since each beam has its own

frequency and the fan width is

congurable, the design also allows

you to use all the beams over the

full frequency range pointing in one

direction for frequency analysis of

targets.

Key points

• The Simrad ME70 operates in

the 70 to 120 kHz frequency

range.

• The Simrad ME70 provides

a congurable acoustic fan

containing 3 to 45 stabilized

beams.

• All beams can be congured as

split beams.

• Calibration software included.

• Minimum beam opening is

2° depending on operational

frequency and steering.

• 140° maximum total swath

width.

• The athwartship centre angle

of the fan can be adjusted from

+45° to -45°.

• Minimum acquisition depth

is less than 1 m below the

transducer depending on beam

mode conguration.

• Sidelobe levels and beam

interleakage are adjustable

from -35 to -70 dB depending

on beamwidth and frequency

conguration.

System description

(CD10104G)

Calibration

A calibration utility is

implemented as a special built-in

function in the Simrad ME70 system.

Each beam conguration of interest

can be calibrated using a reference

target located under the ship.

Individual gain parameters for

each beam are adjusted to provide

calibrated target strength and volume

backscattering strength measurements.

Splitbeam conguration

All beams can be congured

as split beams. In addition, two

adjustable reference split beams are

available. These allow you to compare

ME70 data with data from other split

beam systems, for example the EK60.

The reference beams can for example

have 7x7 degrees opening angles, and

operate on 70 and 120 kHz.

The data from the individual split

beams are presented in the same way

as on other Simrad scientic sounders.

Data output

It is possible to set up continuous

output of all beam data. This can be

used for echo integration and 3D

visualisation. The output data for each

beam include for example:

• non-TVG compensated sample

power and sample angle

• 20 log R compensated sample Sv

• 40 log R compensated sample TS

• 40 log R compensated single target

detections

• Detected depth

It is also possible to output the

element data for post processing and

analysis purposes.

Remote operation

Remote systems, such as data

loggers and external post-processing

systems, can subscribe to data and

parameters from the Simrad ME70.

The parameters can also be queried

and dened by the remote system. In

this way the communication between

the ME70 and the remote system can

become an efcient, congurable,

two-way communication.

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