Research On Long Time Coherent Integration Algorithm For High Speed Maneuvering Target

By increasing the observation time and using long-time coherent integration can effectively improve the echo's signal to noise ratio(SNR)and radar detection performance.However,during the coherent integration process,the target's high speed and mobility will bring about the range migration(RM)and Doppler frequency migration(DFM),which make the traditional coherent integration method became invalid.Regarding the challenges metioned above,in this thesis,the coherent integration algorithm for high speed maneuvering target is studied.The main contributions of this thesis are as follows:1.In order to corret the RM and compensate the DFM of a maneuvering target with constant acceleration,two coherent integration algorithms,i.e.,RLVD and KTLVD,are proposed to realize the coheret accumulation of weak target's energy and improve the target detection performance under low SNR background.2.In order to correct the linear RM and complex DFM of a high speed maneuvering with acceleration rate motion,two coherent integration algorithms,i.e.,KTGDP and KTCPF,are proposed to achieve the target's motion parameter estimation.The CLEAN-based coherent integration method for multiple targets is proposed to realize the coherent accumulation and motion parameter estimation of multiple targets for the scene that targets interfere each other.3.Two coherent integration algorithms,i.e.,GKTGDP and TRT-SKT-LVD,are proposed to correct the three-order RM of a maneuvering target with acceleration rate motion and obtain the coherent accumulation of target energy,which are also able to avoid the blind speed sidelobe problem.4.For the coherent integration and motion parameter estimation problem of a maneuvering target with acceleraiton rate,two fast coherent accumulaiton algorithms,i.e.,ACCF-LVD and iterative ACCF,are proposed to remove the Doppler curvature and RM and reduce the computational complexity.5.For the coherent integration problem of a maneuvering target with arbitrary high-order motion,an loop iterative ACCF coherent accumulation algorithm is proposed.The presneted algorithm does not need any parameter search process and thus the computational complexity can be greatly reduced.The TRT-SGRFT algorithm is also proposed to solve the problem of bind speed sidelobe and improve the target detection performance as well as the parameter estimation accuracy.