In the bearings-only passive locating system with single station,the Extended Kalman Filtering(EKF) algorithm is used to diverging when the initial state estimation of the target is of low precision.

• 只测角单站无源定位跟踪系统中,目标初始状态估计精度较低时,采用扩展卡尔曼滤波算法经常出现滤波发散的情况。