Target detection method and device for FRFT domain singular value features in sea clutters

Abstract

The invention relates to a target detection method and device for FRFT domain singular value features in sea clutters, electronic equipment and a storage medium. The method comprises the following steps: obtaining sea clutter data through a radar; performing FRFT calculation under a plurality of transformation orders on each distance unit by using the sea clutter data to obtain an FRFT spectrum; performing singular value decomposition SVD on the matrix of the FRFT spectrum to obtain a singular value matrix; accumulating the singular values of the front predetermined item with the predetermined energy ratio in the singular value matrix to obtain a corresponding total singular value on each distance unit; detecting the target based on the total singular value on each distance unit; and judging the characteristics of the target based on the FRFT spectrum on each distance unit. According to the method, FRFT spectrum calculation under multiple transformation orders is completed by adopting FRFT, then the FRFT spectrum is constructed into a matrix, singular values with a certain energy ratio are extracted through singular value decomposition, and the spatial change relevance of the FRFT spectrum is reflected.

Description

technical field [0001] The present invention generally relates to a sea clutter suppression method, and more particularly, relates to a target detection method and device, electronic equipment, and storage medium for singular value features in the FRFT domain in sea clutter. Background technique [0002] The structure of the sea surface is complex and changeable, and the mechanism of electromagnetic scattering is very complicated. In the case of large grazing angle and high resolution, the suppression of sea clutter and effective target detection are the key points and difficulties of radar target detection. [0003] Since the detection of maneuvering targets at sea is often affected by strong sea clutter, in order to effectively accumulate target energy, and because target maneuvers can be approximated as uniform acceleration / deceleration movements in a short period of time, Fractional Fourier Transform (FRFT) processing methods are usually used Accumulate the target energy...

AI Technical Summary

Problems solved by technology

[0003] Since the detection of maneuvering targets at sea is often affected by strong sea clutter, in order to effectively accumulate target energy, and because target maneuvers can be approximated as uniform acceleration / deceleration movements in a short period of time, Fractional Fourier Transform (FRFT) processing methods are usually used Accumulate the target energy, but the classical FRFT processing method needs to search for the optimal transformation order, which is often difficult to achieve for unknown targets

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