短波时差定位中电离层参数对定位影响仿真

Simulation on the effect of ionospheric parameters on TDOA location in short wave

在短波波段,由于电离层反射传播,电波传播路径与实际地面距离存在较大差异,传统时差定位方法不再适用.文章提出一种基于电离层射线追踪技术的时差定位技术,在此基础上,仿真分析了电离层参数对定位精度的影响.结果表明:在准确获取电离层信息情况下,本方法可准确定位目标;电离层测量误差对定位精度影响较大;站点增加可提高定位精度,降低对电离层参数获取精度要求.仿真结果为短波时差定位系统研制以及电离层参数获取精度要求提供了理论依据.

In the short wave band, traditional time difference of arrival（TDOA） location method is no longer applicable for the big difference between the radio path and the actual ground distance brought on by the ionospheric reflection propagation. A new TDOA location method based on ray tracing technique is proposed, and the influence of ionospheric parameters on location precision is analyzed. The results show that in obtaining accurate ionospheric information, the proposed method can accurately locate the target; i- onospheric measurement error greatly affects the location precision- increase the number of sites can im- prove location precision and reduce the precision requirements of the ionospheric parameters. The simulation results provide a theoretical basis for the development of the short wave TDOA location system and the precision requirement of the ionospheric parameters.