Short-distance sound source combined positioning method based on shallow-sea multipath arrival angle and arrival time delay

Abstract

The invention relates to a short-distance sound source combined positioning method based on a shallow-sea multipath arrival angle and arrival time delay, and the method comprises the steps: estimating the multipath arrival angle information of a sound source through employing a weighted subspace high-resolution method, and estimating the multipath arrival time delay information of the sound source through calculating an autocorrelation function of a signal; finally constraining the multipath arrival angle and multipath arrival time delay information in a positioning fuzzy function at the same time, thereby achieving the accurate positioning of the shallow-sea short-distance sound source.

Description

technical field [0001] The invention relates to a short-distance shallow sea sound source positioning method, in particular to a joint positioning method using multiple arrival angles and arrival delays of short-distance sound sources in shallow seas, which is suitable for shallow sea areas with relatively stable horizontal changes, and belongs to hydroacoustics and underwater acoustic signal processing. Background technique [0002] The invention is mainly used for short-distance sound source positioning in shallow sea. In the shallow sea environment, because the underwater acoustic environment is very complex, sound source localization has always been a key issue in the field of underwater acoustics. The multi-path angle of arrival information for short-distance sound sources in shallow sea reflects the distance information of the target sound source, while the multi-path arrival delay information reflects the depth information of the target sound source. In this paper, ...

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Problems solved by technology

The waveguide invariant method uses the robust interference structure characteristics of the sound field in the shallow sea waveguide on the distance and frequency two-dimensional planes. The source depth parameter is not sensitive and cannot effectively estimate the depth of the sound source

[0004] Through the research, it is found that when only the multi-path angle of arrival information of the received signal is used for sound source localization, since the multi-path angle of arrival information is only sensitive to the distance information of the sound source, it will appear blurred in the depth direction of the sound source during positioning; but When only the multi-path arrival delay information of the received signal is used for sound source localization, since the multi-path arrival delay information is only sensitive to the depth information of the sound source, ambiguity will appear in the sound source distance direction during positioning

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