临近空间伪卫星定位精度仿真分析

基于临近空间的伪卫星具有非常显著的定位优势,提出了基于临近空间飞艇定位的伪卫星方案。通过理论分析,设计了基于4颗伪卫星的最佳布局方案;通过仿真计算得到了伪卫星覆盖区域内各点的几何精度因子;通过对伪卫星的星历误差、星钟误差和对流层延迟误差等主要误差源的分析,计算得到了基于飞艇伪卫星的定位测距误差,并给出了伪卫星覆盖区域内用户的定位误差。仿真结果表明,基于临近空间的伪卫星具有较好的定位精度,可以满足区域导航定位的精度要求。

Analysis of Position Precision of Near Space Pseudolite

The pseudolite deployed in near space has great advantages on positioning. Firstly, the pseudolite configuration with near space airships＇ positioning support is put forward. Then, the best way of four pseudolites configuration is designed. By simulation, the geometric dilution of precision （GDOP） in the coverage of the pseudolites is obtained. After that, the UERE is calculated through analyzing the pseudolites＇ main errors： the ephemeris error, the satellite clock bias error, and the troposphere delay error, etc. Finally, the user position error in the coverage of the pseudolites is given. The simulation results show that the pseudolite deployed in near space has a fairly good positioning accuracy which can satisfy the requirement of regional navigation and position.