Double-parameter CFAR (Constant False Alarm Rate) ship detection method based on Fourier transformation

Abstract

The invention discloses a double-parameter CFAR (Constant False Alarm Rate) ship detection method based on Fourier transformation. The method comprises the steps of acquiring SAR (Synthetic Aperture Radar) radar echo data, and imaging the SAR radar echo data to obtain an SAR radar imagingdata matrix I, and further obtain a binary image matrix Ibw subjected to threshold processing, wherein the Ibw is a binary image containing a ship target and a false target; setting an all 1 matrix as a background window; sequentially calculating a clutter number statistical matrix N in the background window and a clutter number statistical matrix in the background window after reciprocal taking operation, and further calculating a clutter mean value statistical matrix M in the background window; then calculating a clutter variance statistical matrix V in the background window, and calculating a ship target determination matrix F; finally detecting to obtain a plurality of ship targets according to I and F, wherein each detected ship target is an interesting ship target, so that the separation of the interesting ship targets and false targets is accomplished, and the detection of the interesting ship targets is further accomplished.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, in particular to a two-parameter CFAR ship detection method based on Fourier transform, that is, a two-parameter constant false alarm rate (Constant False Alarm Rate, CFAR) ship based on Fourier transform The detection method is a target detection method in a synthetic aperture radar, and is suitable for radar moving target detection in a synthetic aperture radar or an inverse synthetic aperture radar under a Gaussian background. Background technique [0002] In large-scene high-resolution Synthetic Aperture Radar (SAR) image detection, the Constant False Alarm Rate (CFAR) algorithm is the most widely used algorithm in the field of SAR image target detection, including traditional CFAR Algorithm and two-parameter CFAR detection algorithm; the specific implementation process of the traditional CFAR algorithm is: according to the classical statistical detection theory, under the giv...

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Problems solved by technology

[0005] In view of the problems existing in the prior art, that is, the two-parameter CFAR detector cannot accurately detect close-range ship targets, and there are problems of large amount of calculation and low detection efficiency, the purpose of the present invention is to propose a Fourier transform-based Two-parameter CFAR ship detection method, this kind of two-parameter CFAR ship detection method based on Fourier transform can quickly detect ship targets in SAR images, and has a small amount of calculation and high detection efficiency

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