摘要
针对多运动站无源融合定位系统中的异步观测问题,该文提出一种基于空间谱分析的直接定位算法。首先利用子空间分析理论建立异步观测直接定位模型,构造多站协同定位联合空间谱函数,采用多级搜索方法实现定位解算。然后推导了该算法的定位误差协方差矩阵及克拉美罗下限。最后对该算法在异步观测条件下的定位性能进行蒙特卡洛仿真。仿真结果表明算法定位精度能够逼近克拉美罗下限,定位性能优于基于定位参数的分步定位算法,尤其在低信噪比情况下优势更明显。
A Direct Position Determination (DPD) algorithm based on spatial spectrum analysis ~or the issue or asynchronous observation in the multiple moving sensors passive fusion location system is proposed. At first, a direct determination mathematical model of the asynchronous scene is constructed and a multiple sensors cooperative spatial spectrum function is composed. Furthermore, the position of the emitter can be got by a two or three dimensional search, and then the derivations of the estimators' variance and the Cramer-Rao Lower Bound (CRLB) are given. Finally, the Monte Carlo simulations over the asynchronous scene indicate that the accuracy of the proposed method is close to the Cramer-Rao lower bound and superior to the two-step location method based on the location parameters, especially in the low SNR.
作者
冯奇
曲长文
周强
FENG Qi QU Changwen ZHOU Qiang(Department of Electronic and Information Engineering, Naval Aeronautical and Astronautical University, Yantai 264001, China Scientific Research Department, Naval Aeronautical and Astronautical University, Yantai 264001, China)
出处
《电子与信息学报》
EI
CSCD
北大核心
2017年第2期417-422,共6页
Journal of Electronics & Information Technology
关键词
无源定位
异步观测
直接定位
阵列信号处理
脉冲到达角
Passive location
Asynchronous observation
Direct Position Determination (DPD)
Array signal processing
Angle of arrival