中文摘要：

高频地波雷达方位分辨率很低,尤其是对于远距离的低信噪比目标,难以给出较准确的方位角信息,从而易导致检测点迹高度分散,严重影响超视距目标的航迹形成。针对该问题,提出无角度双站地波雷达组合定位与跟踪系统的新构想。该系统由两部地波雷达站组成,仅利用各站得到的距离和径向速度观测信息进行交叉定位和跟踪。分析了该系统的两个关键问题,重点讨论跟踪滤波算法问题,建立系统定位与跟踪模型,并利用扩展卡尔漫滤波（extended Kalman filter,EKF）进行目标状态的非线性滤波估计。

英文摘要：

The azimuth accuracy of the high frequency ground wave radar is poor in an actual environment.This problem is worse when tracking the long-range targets with low signal to noise ratio,which can cause the plots highly decentralized and damage the formation of the over-the-horizon tracks.A high frequency ground wave bi-station system is proposed to triangulate target tracks using only range and Doppler measurements.Two key issues are discussed here,focusing on the issue of positioning and tracking filter algorithm.The locating model of this system is established and the nonlinear tracking problem is solved by extended Kalman filter（EKF）.The simulation shows that EKF can handle it well,and the accuracy of this system can meet or slightly better than the conventional single station tracking system with coarse azimuth measurements.