A broadband target detection method in a complex environment with strong interference

Abstract

The invention discloses a broadband target detection method in a complex environment with strong interference. The method includes: receiving a time-domain array signal collected by a uniform line array, and dividing the time-domain signal of each channel into a plurality of subbands through Fourier transform , obtain the signal matrix in the array element domain-frequency domain; the signal matrix in the array element domain-frequency domain is filled with zeros in the array element dimension, and converted to the frequency domain-wavenumber domain through the spatial Fourier transform; the main lobe discrimination method is designed to identify different targets for the same target. The main lobe of the wavenumber spectrum at the frequency; the main lobe allocation rule is designed to realize the allocation of all main lobes on the full-band wave number spectrum; the azimuth is formed by the mutual weighting of the main lobe energy accumulation and main lobe number accumulation in the processing frequency band spectrum, so as to achieve broadband target detection. The method of the invention has the advantages of effectively detecting weak targets in a complex environment with multiple targets and strong interference, and has both stability and reliability.

Description

technical field [0001] The invention belongs to the field of array signal processing, and particularly relates to a broadband target detection method in a complex environment with strong interference. Background technique [0002] Broadband target detection is an important means of underwater detection by passive sonar, and it is the basis for subsequent tracking and identification, and is a key step in the entire underwater detection. At present, in the complex underwater environment, multi-target and strong interference seriously affect the detection of broadband weak targets. Therefore, in order to improve the detection capability of underwater targets, the patented design method detects broadband targets. [0003] Scholars at home and abroad have conducted extensive and in-depth research on the problem of broadband target signal detection, and proposed many methods. For example, Reference 1 (Subband energy detection in passive array processing, 2000) proposed a subband ...

AI Technical Summary

Problems solved by technology

[0004] At present, most of the above methods are used in the azimuth domain-frequency domain to detect the sub-band peak energy or to accumulate the number of sub-band peaks. Using "spatial consistency" improves the detection ability of broadband targets, but there will still be a high false alarm problem

Broadband target detection is performed in the frequency domain-wavenumber domain. At present, strong energy in small bandwidths or weak energy in large bandwidths is not considered. In these cases, it is easy to miss detection.

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