无源雷达高速目标回波相参积累和参数估计算法  

Coherent Integration and Parameter Estimation of High-Speed Target in Passive Radar

作　　者：杨静[1,2] 刘成城 黄洁[1] 张媛媛[2] YANG Jing;LIU Chengcheng;HUANG Jie;ZHANG Yuanyuan(Information Engineering University,Zhengzhou 450001,China;Unit 32738,Zhengzhou 450032,China)

机构地区：[1]信息工程大学,河南郑州450001 [2]32738部队,河南郑州450032

出　　处：《信息工程大学学报》2024年第1期1-8,29,共9页Journal of Information Engineering University

基　　金：国家自然科学基金资助项目(62071490)。

摘　　要：针对无源雷达高机动匀速目标参数估计中长时间积累引起的距离徙动效应问题,提出了一种基于Keystone变换和圆阵干涉仪测向的高效相参积累和参数估计算法。首先,根据目标运动和外辐射源信号参数,对参考信号和监视信号进行分段处理,段内为快时间,段间为慢时间;然后,利用Keystone变换对各频率的时间轴进行尺度变换,校正高速目标的距离徙动,继而将目标回波信号能量积累至同一时延-多普勒单元;最后,对目标回波所在的时延-多普勒单元进行圆阵干涉仪二维测向,得到目标方位角和俯仰角估计。仿真结果表明,算法可有效实现高机动匀速目标微弱回波信号的相参积累和参数估计,计算复杂度更低,对目标时延、多普勒、方位角和俯仰角参数估计的稳健性和精度更高。To solve the problem of range migration effect caused by long time accumulation in parameter 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 Keystone 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-coherent accumulation and parameter estimation of the weak echo signal of the target with high maneuvering 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.

关 键 词：无源雷达 高速目标 距离徙动 相参积累 参数估计 波达方向 均匀圆阵 

分 类 号：TN971[电子电信—信号与信息处理]