Active sonar panoramic contact target rapid identification method

Abstract

The invention relates to an active sonar panoramic contact target rapid identification method, which comprises the following steps of: firstly, receiving active sonar array element data, and preprocessing to generate full-beam time domain data; dividing the full-beam time domain data into L segments, respectively carrying out FFT processing to obtain L motion characteristic spectrums, and carrying out spectral line moving and two-dimensional normalization processing on the motion characteristic spectrums; performing motion feature isolated point detection on the normalized motion feature spectrum, and performing conversion according to the coordinate position of the motion feature isolated point to obtain the orientation, distance and radial speed value of the target; and finally, reconstructing a panoramic contact target rapid identification picture. According to the active sonar panoramic contact target rapid identification method provided by the invention, the distribution difference of the target and the static reverberation on the motion characteristic spectrum is utilized, the panoramic static reverberation / clutter can be effectively inhibited, the underwater interested target can be rapidly identified, the interested target discovery time is greatly shortened, the detection efficiency is remarkably improved, and the method is suitable for popularization and application. The processing method is simple and high in reliability.

Description

technical field [0001] The invention relates to a sonar signal processing method, belonging to the fields of underwater acoustic engineering, sonar technology and active sonar signal processing, and mainly relates to a rapid identification method for active sonar panoramic contact targets. Background technique [0002] Active sonar can detect, track and identify underwater targets by transmitting signals, receiving and analyzing the reflected echoes of underwater targets. Existing active sonar signal processing methods generally first perform energy detection on target echoes to obtain contact-level data, and then track and identify underwater targets of interest. However, there are two problems with existing active sonar signal processing methods: [0003] First, with the development of active sonar detection technology, the active sonar range continues to increase, the number of targets that can be found by sonar is increasing, and the reverberation blind area is graduall...

AI Technical Summary

Problems solved by technology

The traditional active sonar signal processing method is mainly based on energy detection, which cannot solve the contradiction between weak target missed detection and high false alarm

[0004] The second is that the traditional active sonar signal processing method first detects the energy of the echo, obtains the target trace, and then uses continuous batches of trace data to track the target, and finally identifies the stable tracking target, and obtains reliable identification results from contact However, underwater vehicles, frogmen, or marine organisms that need to be monitored are often in motion and need to be quickly identified after contact. Traditional active sonar signal processing methods severely restrict the discovery and detection efficiency of underwater targets of interest.

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