Coherent accumulation method and coherent accumulation system for high-speed maneuvering target

Abstract

The invention belongs to the technical field of radar signal processing, and particularly relates to a coherent accumulation method for a high-speed maneuvering target. The method comprises the steps: receiving a target echo signal by a radar receiver, and carrying out pulse compression on the target echo signal to obtain a pulse-compressed echo signal; performing fast Fourier transform on thepulse-compressed echo signal to obtain a distance frequency signal; performing second-order Keystone transformation on the distance frequency signal in a distance frequency domain to obtain a signal after the second-order Keystone transformation; based on the signal after the second-order Keystone transformation, constructing a symmetric autocorrelation function and variable scale Fourier transform, constructing a first compensation function, then performing fast inverse Fourier transform and lu transform to obtain a radial initial speed and an initial acceleration of the target, constructing a second compensation function, then performing fast inverse Fourier transform and fast Fourier transformfor phase-coherent accumulation; and performing target detection on the phase-coherent accumulation result of the target.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing and radar maneuvering target detection, and in particular relates to a coherent accumulation method and a coherent accumulation system for high-speed maneuvering targets. Background technique [0002] In the development of modern radar technology, the detection of high-speed maneuvering targets has always been a difficult problem. Such targets often lead to weak radar echoes and lower signal-to-noise ratios, thereby reducing radar detection performance. In order to improve the detection probability, it is undoubtedly a simple and effective method to prolong the irradiation time of the radar without changing the hardware parameters of the radar. Then, in the long-term coherent accumulation process, the envelope of each echo pulse will not be able to It causes the broadening of the main lobe and the decline of the accumulation peak, and makes the accumulated energy of the target spre...

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Problems solved by technology

This method eliminates the influence of linear distance walking through the joint search of distance and speed. However, due to the need for two-dimensional parameter search, the large amount of calculation and high computational complexity are a major limitation of this algorithm in engineering applications.

[0003] Bruce Lee et al. (see literature [2]: X.L.Li, G.L.Cui, L.J.Kong, W.Yi, "Fast Non-Searching Method for Maneuvering Target Detection and Motion Parameters Estimation," IEEE Trans.Signal Process.64(2016) 2232–2244 .) A method based on adjacent autocorrelation function and Lu transform is proposed to solve the range migration and Doppler spread, however, due to the use of adjacent autocorrelation function, the method has low anti-noise performance

[0004] In addition, the existing methods cannot estimate the motion parameters of high-speed maneuvering targets while accumulating target energy, and require parameter search, which is not convenient for real-time processing of radar signals and is not conducive to engineering realization; it is also unable to correct distance migration and Doppler Diffusion, can not effectively improve the signal-to-noise ratio of radar echoes, thereby reducing the detection performance of radar targets

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