线性调频信号辐射源的唯方位跟踪

Bearing-only localization and tracking for maneuver of LFM signal emitter

对宽带线性调频信号的方位角估计以及对这类信号辐射源单站跟踪问题进行了研究。算法通过对称阵元Wigner Ville分布 (WVD) ,建立了一种新颖的具有分维结构的空间时频分布数据模型 ,并利用Beamspace ESPRIT和子空间投影法估计信号瞬时频率向量和到达角。在到达角估计的基础上 ,针对在直角坐标系中利用扩展的卡尔曼滤波器的唯方位跟踪法不稳定问题 ,采用了修改的极坐标 ,实现了运动单站对运动辐射源的稳定和渐进无偏的定位与跟踪。

In this paper,the problem of DOA estimation and single station localization and tracking of wideband chirp signals emitter researched. Firstly,a novel separable spatial time-frequency structure is constructed using WVD of symmetrical array. Then,the beamspace-ESPRIT and subspace projection are employed to estimate the instantaneous frequency and DOA. Once the DOA is estimated,emitters may be localized and tracked using bearing-only method in modified polar coordinates. The presented method can overcome the instability of extended Kalman filter tracking algorithm in the Cartesian coordinate,and achieve localization and tracking with both stable and unbiased.