Research On Long Time Coherent Integration Algorithm For High Speed Target

In order to realize the detection of weak targets flying in the air by radar,we generally use the method of increasing the radar illumination time to improve the signal-to-noise ratio of the radar signal echo.The increase in radar illumination time means an increase in the number of integrated echo pulses,which is conducive to improving the radar's ability to detect weak targets.Coherent integration that retains and utilizes the phase information of the target is a common method to significantly improve the radar signal-to-noise ratio.However,with the continuous emergence of flying targets with high speed and high maneuverability,in the process of radar's coherent integration of targets for a long time,it will inevitably lead to the phenomenon of range migration and Doppler frequency migration.These effects will seriously reduce the integration gain of radar echo,and then deteriorate the detection performance of radar.The traditional moving target detection algorithm fails because it cannot correct range walk and Doppler frequency walk.Because of the problems mentioned above,this paper has been studying a long-time coherent integration algorithm of high-speed targets capable of correcting range migration and Doppler phase compensation.The remainder of this paper is organized as follows:1.For the maneuvering target with constant acceleration and linear range migration,this paper studies the MAR-FrFT and KTHAF coherent integration algorithms.Furthermore,this paper studies the multi-targets coherent integration algorithm based on modified CLEAN processing.Meanwhile,for the maneuvering target with constant acceleration and second-order range migration,this paper studies the RLVD and KTMFP coherent integration algorithms.2.For the maneuvering target with acceleration rate motion and linear range migration,this paper studies KTGDP,KTCPF and KTCIGCPF coherent integration algorithms,which have the ability to correct the linear range migration,first-order Doppler frequency migration and second-order Doppler frequency migration,and achieve coherent integration of high-speed target.Furthermore,for the maneuvering target with acceleration rate motion and high-order range migration,this paper studies the GKTGDP and iterative ACCF coherent integration algorithms.3.For the maneuvering target with arbitrary high-order motion,this paper first studies the GRFT coherent integration algorithm.To solve the problems of high computational complexity and blind speed side lobes of the GRFT algroithm,this paper further studies the TRT-SGRFT algorithm.This algorithm completes the parameter estimation and energy integration of arbitrary high-order target motion through time reversing transform and multi-dimensional joint search,which effectively improves the target integration performance and suppresses the cross-term interference.A good equation algorithm is achieved between target detection performance and computational complexity.