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Simrad FS25 Manual

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FS 20/25 Operators Manual 901-10037001/1.1
Theory of Operation Page 2.
5
Kongsberg Simrad Mesotech Ltd.
Port Coquitlam, BC - Canada
Note that scattered fish can be perceived as reverberation. The RCG filter must be
used with care if scattered schools are to be detected.
2.1.4.3 RX Gain Response and Type
The setting of the “RX Gain Response” determines the response of the filter
algorithm as selected by the “RX Gain Type”. For the AGC, this setting determines
the speed by which the gain is adjusted. For the RCG, this setting determines the
influence of the previous ping average over the current ping. If set to Slow, the
overall average is given by the sum of 20% current and 80% of previous average. In
Medium this ratio is 50% to 50%, and the Fast, the ratio is 80% to 20%.
2.1.4.4 Pulse Length Control
The FS20/25 Trawl Sonar Heads are capable of changing the acoustic pulse length
that is transmitted. The surface processing unit calculates the pulse length based on
the operating range of the sonar head. It is generally better to use a longer pulse as
the operating range increases. However, the actual value can be optimized to
enhance the details in the sonar image (Optimize Resolution) or to increase the
target visibility at long distance away from the sonar head (Maximum Range). The
system will automatically set the pulse length to match the range, unless manually
adjusted by the operator.
2.1.4.5 Optimize Resolution
The pulse length selection can be optimized to enhance the detail of the targets. It
has been experimentally determined that the pulse length corresponding to 40% of
the sample period can increase the image resolution and details for targets that are
generally larger than a few samples. This pulse length increases linearly with
increasing the operating range.
2.1.4.6 Maximize Range
The pulse length calculation can be optimized to increase the detection range of the
sonar head. Generally, the longer the pulse length, the more energy is transmitted
into the water which could then travel a longer distance and get reflected from the
targets that are further away from the sonar head. It has been determined that the
pulse length corresponding to 80% of the sample period can increase the detection
distance of the targets without major drain on the sonar head power supply. This
pulse length increases linearly with increasing the operating range.
… 21 …


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