无源雷达高速目标回波相参积累和参数估计算法OA

To solve the problem of range migration effect caused by long time accumulation in param-eter estimation of constant velocity targets with high maneuvering in passive radar,an efficient phase-coherent accumulation and parameter estimation algorithm based on Keystone transform and circular array interferometer direction finding is proposed.First,according to the target motion and the signal parameters of the external radiation source,the reference signal and the monitoring signal are processed in segments,and the interval is fast time and the interval is slow time.Then,the Key-stone transform is used to scale the time axis of each frequency to correct the distance migration of high-speed targets,and the target echo signal energy is accumulated to the same delay-Doppler unit.Finally,a circular array interferometer is used to estimate the azimuth Angle and pitch Angle of the target.The simulation results show that the proposed algorithm can effectively achieve the phase-co-herent accumulation and parameter estimation of the weak echo signal of the target with high maneu-vering uniform velocity,and the computational complexity is lower,and the estimation of the target delay,Doppler parameter,azimuth angle and pitch angle parameters is more robust and accurate.