A Vector Array Discrimination Method Based on Sound Pressure and Vibration Velocity Cross Spectrum Method

Abstract

The invention belongs to the underwater sound direction-finding field and relates to a sound pressure and vibration velocity cross-spectrum method-based vector array port and starboard discrimination method. The method includes the following steps that: step (1) after received sound pressure signals are converted into frequency-domain signals, frequency-domain broadband conventional beamforming processing is carried out on the frequency-domain signals, so that an original spatial spectrum matrix can be obtained, wherein the spatial spectrum matrix is a matrix of an outputted spatial spectrum type; step (2) bidirectional one-order recursive filtering processing is performed on the obtained original spatial spectrum matrix, so that a smoothed spatial spectrum can be obtained; and step (3) according to the smooth spatial spectrum, DT decibels are increased based on the smooth spatial spectrum, so that a threshold for spectral peak screening can be obtained. According to the method of the invention, peak screening is carried out on the spatial spectrum; direction estimation is carried out on signals in a spectral peak range; subtractive suppression is carried out on pseudo peak measurement through comparing an estimated result with a spectral peak position; and therefore, the problem of port-starboard ambiguity under a low signal-to-noise ratio can be solved, and weak target detection under a homogeneous noise background can be improved.

Description

technical field

[0001] The invention belongs to the research field of underwater acoustic direction finding, and in particular relates to a vector array starboard and starboard discrimination method based on the sound pressure and vibration velocity cross-spectrum method. Background technique

[0002] In the research field of underwater acoustic direction finding, the direction finding of the towed linear array is based on the difference in time delay between the arrival of the sound source signal from different directions and the different array elements in the linear array. However, the hydrophones that make up the towed line array are usually non-directional, such as figure 1 As shown, 1 in the figure represents the conical surface, and 2 represents the hydrophone of the towed linear array. The responses of the incident signals on the conical surface with the same rotation angle to each element of the array are completely consistent, that is, the incident signals on the s...

Images