Automatic target discovery method based on water sound target bearing history plot

Abstract

The invention discloses an automatic target discovery method based on a water sound target bearing history plot. The method comprises steps as follows: establishing an observation window at the current moment on the water sound target bearing history plot; sliding a plurality of established matching templates on the observation window, calculating a correlation coefficient spectrum of each matching template relative to the observation window, and accordingly, establishing a correlation coefficient matrix of the current observation window; calculating a target detection probability spectrum ofthe current moment on the basis of the correlation coefficient matrix; and determining whether a target exists in the corresponding bearing of each element of the target detection probability spectrum, and obtaining a target direction-finding result. The method has higher finding capability for a target with the bearing rapidly changing, has higher anti-noise capability for image-level noise, canbetter balance false alarm and leaking detection and has higher reliability.

Description

technical field [0001] The invention relates to the technical field of passive sonar signals and information processing, in particular to an automatic target discovery method based on an underwater acoustic target azimuth history map. Background technique [0002] The radiation noise of underwater acoustic targets, such as engine noise, underwater acoustic detection pulses, underwater acoustic communication pulses, etc., can be used by passive detection sonar arrays for target discovery and direction finding. [0003] Discovering and automatically tracking targets with the help of underwater acoustic target azimuth history maps is a commonly used method for underwater acoustic target discovery and azimuth tracking. The method of obtaining the azimuth history map of the underwater acoustic target is as follows: [0004] 1. According to a certain time interval, intercept the signal received by the sonar array with a fixed length; [0005] 2. Based on a certain array element ...

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Problems solved by technology

[0015] 1. The received signal of the sonar array is mixed with marine environmental noise, which may easily lead to missed detection or false alarm

[0016] 2. When the target orientation changes rapidly, the orientation corresponding to the energy peak will change, which will interfere with the cumulative judgment of the duration of the energy peak in a specific orientation.

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