Target detection method under array ground wave radar sea clutter background based on correlation characteristics

Abstract

The invention discloses a target detection method under an array ground wave radar sea clutter background based on correlation characteristics. The method comprises the following steps: selecting a coherent accumulation time parameter for correlation detection, performing pulse compression on multi-channel time domain data received by each array element of an array ground wave radar, and performing coherent accumulation to obtain a channel-distance-Doppler spectrum; calculating correlation values of a multi-channel-distance-Doppler spectrum along a distance dimension and along a Doppler dimension; determining a detection threshold; and finally, outputting a target position by adopting a method of channel-distance dimension detection and channel-Doppler dimension two-dimensional composite detection plus extreme value detection. According to the target detection method disclosed by the invention, the dependence on the identification of sea clutter, noise and other regions is reduced, anaccurate background clutter model is not needed, the detection of targets in the sea clutter is effectively realized, which is difficult to achieve by conventional amplitude threshold detection, the adverse effect of a noise base in a ground wave radar distance-Doppler spectrum on correlation calculation is eliminated, and the target detection method is closer to practical application by utilizingthe self-contained information of a radar echo object.

Description

technical field [0001] The invention relates to a detection method of an array ground wave radar target, in particular to a two-dimensional detection method of a target under the sea clutter background of the array ground wave radar based on target correlation characteristics. Background technique [0002] Ground wave radar, also known as high-frequency surface wave radar, works in the high-frequency (3-30MHz) frequency band, and can detect targets beyond the line of sight by using the diffraction and propagation characteristics of vertically polarized high-frequency electromagnetic waves along the coastal surface. Compared with other marine monitoring equipment, ground wave radar has the advantages of high measurement accuracy, large monitoring area, and less investment. 24 / 7 real-time monitoring of the ocean. Ground wave radar plays an important role in monitoring my country's exclusive economic zone, safeguarding national rights and interests, and protecting the marine e...

AI Technical Summary

Problems solved by technology

[0011] The object of the present invention is to provide a target detection method based on the target correlation array ground wave radar sea clutter background, which reduces the impact of conventional detection methods on sea clutter. , noise and other area recognition and does not require an accurate background clutter model, especially to solve the problem of undetectable targets in sea clutter

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