Acoustic vector circular array broadband coherent signal source direction-of-arrival estimation method

Abstract

The invention provides an acoustic vector circular array broadband coherent signal source direction-of-arrival estimation method. Received data is divided into L sub-segments, and the DFT transform of the J point of every sub-segment is carried out, and 3M*1 dimensional array sample data of every sub-segment is acquired, and therefore the broadband data model of the acoustic vector circular array is acquired. A preprocessing matrix Tp(fi), a preprocessing matrix Tvr (fi), and a preprocessing matrix Tv phi (fi) are used to transform the acoustic vector circular array from an element domain into a phase modal domain, and a sub-segment receiving data cross spectrum matrix Repv (fi) is acquired in the phase modal domain. The cross spectrum matrix Repv of the acoustic vector circular array broadband signals is acquired by adopting a frequency domain average method. The direction-of-arrival estimation is carried out by adopting a sub-space processing method, and therefore a direction-of-arrival of a target is acquired. Sound pressure vibration velocity combination signal processing is realized in the phase modal domain, and therefore a strong noise suppression capability is provided, and a broadband coherent signal source estimation problem is realized. An initial focusing area is not required to be determined during designing of a focusing matrix, and direction-of-arrival estimation errors caused by the initial focusing area of the focusing matrix are overcome.

Description

technical field [0001] The invention relates to a vector sensor array signal processing method applied to remote passive detection of underwater targets. Background technique [0002] As a new type of underwater acoustic sensor, the acoustic vector hydrophone can obtain the sound pressure and particle velocity vectors in the sound field synchronously at the same point in space, and has many advantages. The sound pressure and particle velocity components obtained by the vector hydrophone can be used to unambiguously orient the sound source in the whole space, and can obtain the detection performance equivalent to the four-element sound pressure array sonar system; the vector hydrophone also has the independent Due to the spatial directivity of the sound wave frequency, this advantage is particularly prominent under the trend of low-frequency development of the underwater acoustic system, which can make the sonar system based on the vector hydrophone have better low-frequency ...

AI Technical Summary

Problems solved by technology

However, the existing CSS method needs to estimate the target orientation when selecting the focusing matrix, and the estimated orientation deviation affects the orientation estimation performance of the CSS method.

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