基于高程多假设的地固单站短基线运动辐射源跟踪方法

Emitter tracking method using short baseline by a single ground fixed observer based on multiple height hypotheses

与地面固定多站无源定位跟踪滤波体制相比,采用基于地面固定单站短基线定位跟踪滤波体制,系统复杂度和成本低,无需观测站之间时间/频率同步。针对存在显著高程的匀速巡航运动辐射源跟踪问题,提出了一种基于高程多假设的地固单站一维测向+短基线差分相位差的运动辐射源跟踪方法,采用多个并行的具有不同高程的扩展卡尔曼滤波器进行跟踪滤波,通过对每个滤波器的输出加权得到跟踪滤波结果。推导了多次观测滤波条件下辐射源运动状态估计的克拉美-罗下限。计算机仿真验证了该方法的有效性。

Compared with the passive target tracking system using multiple ground fixed observers,tracking system using a single ground fixed observer has lower complexity and cost,and no need for time and frequency synchronization between observers.To alleviate the performance degradation caused by the remarkable height of the constant velocity moving target,a emitter tracking method based on multiple height hypotheses using 1D direction of arrival and difference of phase difference of arrival using short baseline by a single ground fixed observer is proposed.This method utilizes parallel extended Kalman filters to obtain the weighted filtering result,and each filter is initialized with a different target height.The Cramer-Rao lower bound of the moving emitter state is also derived under the observing condition.The simulation proves the effectiveness of the proposed method.