User guide

901-10037001/1.1 FS 20/25 Operators Manual
Page 2.6 Theory of Operation
Kongsberg Simrad Mesotech Ltd.
Port Coquitlam, BC - Canada
2.1.4.7 Peak Detection
The Peak Detection feature can only be described as follows.
The older sonar heads were not capable of changing the acoustic pulse length. They
were generally operated at a pulse length of 100 Microseconds. This meant that at
range greater than 50 meters, there would have a good chance of not detecting
small targets. The reason for this is that the combination of small target size, short
pulse length and long sample period could result in the acoustic return from the
target to fall in between two samples and therefore not seen on the sonar image.
To remedy this, it was decided to take additional samples and select the strongest
echo target for the sonar image display. This is generally referred to as Peak
Detection because we are detecting the peak value of signal in between two
samples. The user can select the number of additional samples that the system
takes in order to detect the peak value.