Orientation method based on sound level difference

Abstract

The invention discloses an orientation method based on a sound level difference, comprising the following steps of: arraying by using two or more directive hydrophones, and receiving signals by adopting directive hydrophones with open angles in an acoustic axis direction; acquiring a corresponding relation diagram between a sound level difference and a target orientation according to the directional patterns of the hydrophones and the open angle of the acoustic axis direction, wherein the sound level exists in different array receiving signals; carrying out time-frequency transform on different array receiving signals through a signal processing module, calculating the ratio of corresponding frequency point modes and carrying out cylindrical counting on the ratio so as to calculate the sound level difference corresponding to different targets; and calculating the target orientation according to the sound level difference and the acquired corresponding relation between the sound level difference and the target orientation. The invention has the advantages of simple array design and capability of effectively avoiding the angle ambiguity problem and the limitation of accurate arraying because of being unrelated to the phases and the time delay information of the signals.

Description

technical field [0001] The invention relates to sound direction finding technology, mainly a direction method based on sound level difference. Background technique [0002] The commonly used acoustic direction finding technology is mainly based on the time delay difference or phase difference of the received signals of different array elements, such as the beamforming method, the time delay-based directional method, etc. Among them, the time delay estimation methods mainly include direct correlation method and generalized correlation method , phase spectrum method, parameter model delay estimation method and adaptive filtering method, and some improved algorithms such as high-order statistics method appeared later. Orientation algorithms based on delay or phase due to The periodicity of the item, when the signal frequency is too high, the angle will be ambiguous, and the true orientation of the target cannot be determined; and for high-frequency signals, the small measurem...

AI Technical Summary

Problems solved by technology

Orientation algorithms based on delay or phase due to The periodicity of the item, when the signal frequency is too high, the angle will be ambiguous, and the true orientation of the target cannot be determined; and for high-frequency signals, the small measurement error of the array element position will seriously affect its estimation accuracy, so the array element position The measurement accuracy requirements are relatively high or the phase calibration of each array element data is required

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