基于多特显点的无人机分布式相参雷达相位同步误差估计方法  

Phase synchronization error estimation based on prominent scatterers for UAV distributed coherent aperture radar

作　　者：刘晓瑜 吴建新[1] 王彤[1] 陈金铭 LIU Xiaoyu;WU Jianxin;WANG Tong;CHEN Jinming(National Laboratory of Radar Signal Processing,Xidian University,Xi'an 710071,China)

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室

出　　处：《系统工程与电子技术》2020年第4期781-791,共11页Systems Engineering and Electronics

基　　金：国家自然科学基金（61471285）;中央高校基本科研业务费专项资金（JB190203）资助课题

摘　　要：分布式相参雷达(distributed coherent aperture radar,DCAR)实现全相参的关键是相位同步。然而,滤波器网格失配、单元雷达较强机动性及姿态变化等因素均会对DCAR的相位同步带来不利影响,为此,针对DCAR的相位同步问题,该文提出了一种基于多特显点的无人机DCAR相位同步误差估计方法。该方法首先提出了利用多项式迭代方法消除由于滤波器网格失配引进的残余相位,并根据惯导提供的姿态信息对DCAR回波进行姿态补偿,然后提出了利用Taylor估计法对各单元雷达位置误差进行估计,再根据自校正算法估计出了剩余相位误差,最后对DCAR系统校准以实现相位同步。仿真实验验证了研究结论的正确性。For the distributed coherent aperture radar(DCAR),the precondition to realize fully coherent mode is phase synchronization.However,DCAR phase synchronization is influenced unfriendly owning to grid mismatch filtering,strong maneuverability with ceil radars,posture changes and so on.To solve that,a UAV DCAR phase synchronization error estimation method based on prominent scatterers is proposed.It takes advantage of the polynomial iteration method firstly to eliminate phase residual due to grid mismatch filtering,after which it implements DCAR posture compensation in accordance with inertial navigation system information.Then the Taylor estimation method is proposed to estimate the position error,and other phase errors can be derived by utilizing the self-correcting method.Finally,the DCAR system could realize calibration to accomplish phase synchronization.The numerical examples demonstrate the validity of the theoretical results.

关 键 词：分布式相参雷达 相位同步 网格失配 多项式迭代 Taylor估计 位置误差 

分 类 号：TN958[电子电信—信号与信息处理]