天波超视距雷达海面目标定位方法研究

对单基地天波超视距雷达目标定位精度不高的原因进行了分析，通过仿真计算，给出了电离层虚高和目标方位角所引起的单站目标定位误差，提出了一种利用多基地天波超视距雷达发射站、接收站、电离层与目标之间几何关系，构建非线性定位方程组，实现对目标高精度定位的方法。由于非线性定位方程组中不涉及目标方位角，仅包含电离层虚高和目标位置等未知量，所以通过解方程组能够获得精确的目标位置，消除目标方位角和电离层虚高测量误差所引起的定位误差。通过仿真，验证了该方法的正确性。

Surface Target Location Method of Sky Wave Over-The-Horizon Radar

This paper analyzes the causes of low positioning accuracy of single base sky wave over-the-horizon radar, and gives the positioning error of single station caused by the ionospheric virtual height and the target azimuth through simulation calculation. A method of high precision target location is proposed by utilizing the geometric relationship between the transmitting station, receiving station, ionosphere and the target to construct a set of nonlinear positioning equations. Because the nonlinear positioning equations do not involve the target azimuth, only include the unknown variables such as ionospheric virtual height and target position, the accurate target position can be obtained by solving the equations, and the positioning error caused by the measurement error of target azimuth and ionospheric virtual height can be eliminated. The correctness of the proposed method is verified by simulation.