Title :
Reverberation Suppression Using Wideband Doppler-Sensitive Pulses
Author :
Doisy, Yves ; Deruaz, Laurent ; Van IJsselmuide, Sander P. ; Beerens, S. Peter ; Been, Robert
Author_Institution :
Thales Underwater Syst., Sophia-Antipolis
Abstract :
The influence of transmitted waveforms on the signal-to-reverberation ratio (SRR) of a low-frequency active sonar is analyzed both theoretically and experimentally. Reverberation experiments have been conducted during a sea trial in a littoral water environment in October 1999. The aim of the trials was to compare the performance of three classes of waveforms: standard hyperbolic frequency-modulated (HFM) waveforms, continuous waveforms (CWs), and innovative pulse trains of linear frequency-modulated (PTFM) waveforms. Transmissions were combined (CW/PTFM train) or intermitted (HFM) to compare the performance of the three classes in (exactly) the same environment. Experimental results in highly reverberant environment illustrated that PTFM pulses allow a reduction in reverberation power greater than 10 dB over the standard detection pulses for slowly moving targets. The results are in agreement with theoretical predictions.
Keywords :
Doppler effect; frequency modulation; reverberation; sonar; continuous waveforms; linear frequency-modulated waveforms; littoral environment; low-frequency active sonar; reverberation suppression; sea trial; signal-to-reverberation ratio; standard hyperbolic frequency-modulated waveforms; transmitted waveforms influence; wideband Doppler-sensitive pulses; Acoustic scattering; Frequency; Laboratories; Network address translation; Physics; Reverberation; Sea measurements; Sonar detection; Synthetic aperture sonar; Wideband; Active sonar; Doppler; matched filter; reverberation; sonar waveforms;
Journal_Title :
Oceanic Engineering, IEEE Journal of
DOI :
10.1109/JOE.2008.2002582
