HYDROACOUSTICS
ANNUAL JOURNAL |
START | NEW VOL 20 | SEARCH | STATISTICS | PAS - GDANSK DIVISION |
pp. 199-208, vol. 14, 2011 Roman Salamon Gdansk University of Technology, Gdansk, Poland Jacek Marszal Gdansk University of Technology, Gdansk, Poland Jan Schmidt Gdansk University of Technology, Gdansk, Poland Mariusz Rudnicki Gdansk University of Technology, Gdansk, Poland Key words: CW FM sonar; continuous wave; Doppler effect Abstract: Radars with continuous wave frequency (CW FM sonars) are used in radiolocation as ‘silent radars’. They determine the distance to target by measuring the difference between the
frequency of the sounding signal and echo signal. The article presents the principle of
operation and parameters of silent CW FM sonars. Target distance determined by these
sonars is based on the signal at the output of the matched filter. The Doppler effect is studied
in detail to identify its effect on the sonar’s parameters. The results of theoretical calculations
are presented together with the results of the sonar’s computer simulation.
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