Passive positioning method of single-vector hydrophone

Abstract

The invention provides a passive positioning method of a single-vector hydrophone. The passive positioning method includes: (1) performing short-time Fourier transformation on acoustic pressure signals to obtain time frequency distribution of noise signals; (2) extracting time history of strong line spectrum signals, evaluating the recent passing time of a target according to the time history of a line spectrum frequency, and evaluating the moving speed of the target according to Doppler frequency offset of the line spectrum; (3) finding the direction of the target corresponding to the line spectrum according to the acoustic pressure signals and horizontal vibration velocity signals received by the single-vector hydrophone, and obtaining the direction time history of the target during the point measuring process; and (4) evaluating motion tracks of the target according to the direction time history and motion speed of the target. The passive positioning method of the single-vector hydrophone has the advantages of being capable of positioning the target only by continuously measuring the acoustic pressure and the horizontal vibration speed information without knowing the hydrology parameters of the ocean, and is suitable for deep oceans and shallow oceans.

Description

technical field [0001] The invention relates to an underwater acoustic positioning method. Background technique [0002] The existing underwater acoustic positioning methods mainly fall into two categories: active and passive. Active positioning methods rely on known signal waveforms, while passive positioning methods mainly rely on target noise. The present invention belongs to the latter. Conventional passive positioning methods need the array to measure the distance and direction of the target at different positions in space. For low-frequency band targets, a larger array aperture is usually required. For existing technical means, a single sound pressure hydrophone fixedly deployed on the seabed cannot achieve passive positioning of non-cooperative targets because it has no ranging and direction-finding capability. [0003] Since the vector hydrophone can simultaneously measure the sound pressure and vibration velocity information of the sound field, it can find the di...

AI Technical Summary

Problems solved by technology

Usually these hydrological condition parameters are not easy to obtain, or even if they are obtained, there are large errors and low reliability

[0004] The literature "Single-vector hydrophone-based motion analysis of water surface targets" (Acoustics Technology, 2010.29(4):361-364) gives a single-vector hydrophone positioning method, but it uses the vector hydrophone The measured pitch angle information, this method is only applicable in deep sea or under free field conditions

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