扫描辐射源的最大似然定位算法

针对运动扫描辐射源的扫描速率未知的情况,提出一种最大似然定位算法.该算法将各个时差量测分别投影到目标状态空间,通过对目标状态进行修正、迭代和融合实现对扫描速率和目标状态的最大似然估计,同时避免联合估计方法对运动目标的定位精度不足的问题.此外,针对扫描辐射源定位的特点,重新推导分析误差项,从而改进瞬时定位算法.仿真结果表明,所提出的最大似然定位算法及其改进方法是有效的,后者的定位精度接近CRLB.

Maximum likelihood algorithm for scan-based emitter localization

A maximum likelihood algorithm is proposed to locate the scan-based emitter in the condition of unknown scan rate. This algorithm projects all time difference measurements to the target state space, and then maximum likelihood estimates of the scan rate and the target states can be obtained by modification, iterative calculation and fusion, avoiding the poor accuracy of jointly estimation for moving target. Furthermore, the instantaneous localization algorithm is modified by deducing and analyzing error items for the characteristics of scan-based emitter. Simulation results show that the proposed algorithm and its modification are effective, and the latter localization accuracy approaches Cramér-Rao lower bound.