多卫星导航系统电离层穿刺点分布的仿真分析

Simulation analysis of ionosphere piercing point distribution using multi-satellite navigation systems

针对目前利用GNSS建立的电离层延迟模型无法满足实时、更高精度的导航定位需求的问题,该文基于STK及全国分布的27个地面站,仿真分析了COMPASS、GPS、GALILEO等全球卫星导航系统(GNSS)在中国区域电离层穿刺点分布情况。实验结果说明,单独采用GPS获得的穿刺点数目与GALILEO相当;单独采用COMPASS获得的穿刺点数目相对其他两个GNSS系统较多;而多GNSS系统组合可以明显提升穿刺点数目。此外,对于我国大部分区域而言,单独采用任何一种GNSS系统或多GNSS系统组合,都可保证大部分格网点周围穿刺点数目优于3个;但在我国西南部边缘地区,采用不同的系统组合,穿刺点数目差异较大。本文研究结果表明多GNSS系统组合可显著增加穿刺点数目,有利于提高电离层建模精度。

In view of the situation that using GNSS to establish regional ionosphere model cannot meet the demands of real-time and higher accuracy positioning, this paper used STK and 27 ground stations in China to simulate and analyze the distribution of ionosphere pierce point （IPP） of GNSS, including COM- PASS, GPS and GALILEO. Experimental results showed that the number of IPP obtained by GALILEO and GPS was equivalent; using Compass could get more IPP than the other two systems; multi-satellite system could significantly increase the number of IPP. For most part of China, the number of IPP around grid points could generally reach three or more by using one or any combination of GNSS systems; but for the south-western part, results were quite different when using different system combinations. This paper indicated that the combination of multiple GNSS systems could significantly increase the number of IPP, which could improve the ionospheric modeling accuracy.