"北斗"系统低纬度区域定位精度增强方案探讨

针对我国“北斗”双星定位系统(BDS BeiDou System)在低纬度地区定位精度差的弱点，探讨了几种增强方案，并从精度因子(GDOP Geography Dilution of Precision)的角度比较各方案的优劣，研究表明，基于伪卫星增强双星的方案可改善卫星几何布局，从而有效提高该区域用户的定位精度。仿真说明改方案可提供百米级的定位结果，优于常规的单点定位精度。

Discussion on positioning precision improvement plans of BeiDou system in low latitude aera

Poor positioning precision in low latitude area is one of the most apparent application lack for BeiDou System(BDS). The potential plans to improve the problem are discussed here. Geography Dilution of Precision(GDOP) is chosen to be the standout of the performance estimation. The research work implies that plans based pseudo-satellites is effective because the geography vector among the navigation satellites could be better compared with pseudo-satellites introduction. The simulation data shows that the positioning precision, based pseudo-satellites aiding BDS, is improved to hundreds meters. It is obliviously that the plan is better than those common standalone positioning methods in low latitude area.