摘要
针对方向性辐射源信号主瓣波束窄测向定位精度不足的问题,提出多星分布式无源相干定位方法。首先,根据参考星接收到的主瓣强信号对辐射源位置进行粗定位,并根据粗定位信息对频移进行补偿;随后,将参考星信号分发至临近卫星,在粗定位范围内对相干星接收到的旁瓣弱信号进行互相关搜索,解算时差信息;然后,采用多星时差定位体制估计辐射源精确位置;最后对提出算法进行了Cramer-Rao下界分析,并通过仿真实验对算法进行验证。仿真结果表明,算法在弱信号信噪比(SNR在-40~0 dB)的情况下,定位误差能够快速逼近Cramer-Rao下界,并且能够有效提高辐射源的定位精度。
Aiming at the insufficient accuracy of bearing-only location for the directional emitter,a multi-satellite distributed passive coherent location method was proposed.Firstly,the emitter was roughly located according to the strong signal received by the reference satellite.Then,the reference satellite signal was distributed to the adjacent satellite,and the cross-correlation search was carried out with the side lobe signal in the rough location range to solve the time difference.Furthermore,the precise location of the emitter was estimated by using the multi-satellite time-difference-of-arrival location method.Finally,the Cramer-Rao lower bound analysis of the proposed method was carried out.The method was verified by simulation experiments.Simulation results show that the method can effectively improve the location accuracy of the emitter when the SNR of weak signal ranges from-40 dB to 0 dB.The location error can quickly approach the Cramer-Rao lower bound.
作者
王雨琦
吴楠
张旭
刘丹
王海强
韩笑冬
仲小清
王宁远
WANG Yuqi;WU Nan;ZHANG Xu;LIU Dan;WANG Haiqiang;HAN Xiaodong;ZHONG Xiaoqing;WANG Ningyuan(Institute of Telecommunication and Navigation Satellite,China Academy of Space Technology,Beijing 100094,China;Peng Cheng Laboratory,Shenzhen 518000,China;Beijing Institute of Control Engineering,Beijing 100190,China)
出处
《中国空间科学技术》
CSCD
北大核心
2023年第1期63-68,共6页
Chinese Space Science and Technology
基金
国家自然科学基金(61972398,51907195)
173计划重点项目(2019-JCJQ-ZD-342-00)。
关键词
多星分布式
无源相干定位
旁瓣信号
互相关搜索
CRAMER-RAO下界
multi-satellite distribution
passive coherent location
side lobe signal
cross-correlation search
Cramer-Rao lower bound
