针对超视距目标辐射信号容易受到对流层散射和地球曲率的影响而难以定位的情况,文中对基于双站交叉定位的超视距无源定位模型进行了研究。通过分析超视距目标信号在对流层散射传播的特点,推导了基于对流层散射传播的球面交叉定位计算模型,并且给出了球面交叉定位和传统平面交叉定位的误差分析。仿真结果表明,在上百千米级别的超视距定位中,球面交叉定位与传统平面交叉定位的定位偏差基本可以忽略。

Aiming at the condition that the over-the-horizon target is difficult to locate under the influence of tropospheric scattering and the earth's curvature, passive location model of OTH based on double stations cross location is researched in this paper. A calculation model of spherical cross location based on troposcatter is deduced by analyzing the characteristics of the propagation of the OTH target signal in the troposphere. Finally, the error analysis was given between spherical cross location and traditional plane cross location. The simulation result shows that the localization error of spherical cross location and traditional plane cross location can be ignored basically in the level of hundreds of kilometers for OTH target location.