HYDROACOUSTICS
ANNUAL JOURNAL
START NEW VOL 20 SEARCH STATISTICS PAS - GDANSK DIVISION

Doppler effect in wideband sonars

pp. 31-36, vol. 7, 2004

Andrzej Elminowicz
OBR Centrum Techniki Morskiej, Gdynia, Poland

Leonard ZajÄ…czkowski
OBR Centrum Techniki Morskiej, Gdynia, Poland

Key words:

Abstract: To increase sonar range and to improve the range resolution and SNR, modern sonars use a matched filtration what corresponds to correlation between replica of transmitted signal and received echoes. Motion of sound source or/and object causes frequency Doppler shift of received signals, thereby generating the distortion of the correlation processing of echo with signal replica. In the paper, the results of studies of sonar signals (CW, LFM and HFM) immunity to correlation distortions due to Doppler effect are presented. It has been demonstrated that only HFM signals are immune to adverse Doppler effect in correlation processing.

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