Procedure for eliminating ghost sources from passive sonar comprising several linear antennas
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United States of America Patent
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May 15, 2012
Grant Date -
Apr 1, 2010
app pub date -
Nov 30, 2007
filing date -
Dec 1, 2006
priority date (Note) -
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Abstract
This invention concerns the field of passive sonar systems simultaneously processing several linear antennas. This invention includes a method to eliminate ghost sources for a passive sonar having at least two linear antennas A and B, the method including: An initial acquisition step during which the signal received is measured at different moments ti, and for each antenna, the Doppler frequency f of the signal received is determined, as well as the potential values of the azimuth θ of the source; A second step of determining the potential values of the source performed by use of the measured azimuth θ frequency f values; A third step of eliminating ambiguity and rejecting ghost sources during which it is determined, for which of the potential sources, the speed and frequency values will satisfy, for each moment ti, the measurement equations linking the frequency of the signal received to the frequency f0 emitted by the source, at the source speed and position. Embodiments of the invention concern harbor surveillance systems having several passive linear antennas laid on the seabed and located around the roadstead.
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