BDS-2/BDS-3在极端高度角条件下的定位性能分析

Analysis of BDS-2/BDS-3 Positioning Performance Under Extreme Altitude Conditions

针对极端高度角条件下的BDS定位性能,本文基于POTS站实测数据,分析了BDS-2、BDS-3、BDS-2/BDS-3的卫星可见数、PDOP值、历元可用率以及伪距单点定位精度。经研究发现,BDS-2/BDS-3有效改善了BDS-2、BDS-3在极端高度角条件下的卫星可见数与卫星空间几何分布结构,使利用可用率有明显的增加,即使高度角为40°,BDS-2/BDS-3的历元可用率仍能达到100%,而B1I和B3I在高度角极端条件下,伪距单点定位精度仍能满足一般单点定位精度要求,为观测环境较差下的定位提供一定的参考意义。

In view of the BDS positioning performance under extreme altitude conditions,based on the measured data of the POTS station,this paper analyzes the satellite visible number,PDOP value,epoch availability rate and BDS-2,BDS-3,BDS-2/BDS-3 Pseudorange single point positioning accuracy.It has been found through research that BDS-2/BDS-3 effectively improves the satellite visible number and spatial geometry distribution structure of BDS-2 and BDS-3 under extreme altitude angle conditions,resulting in a significant increase in utilization availability,even if the altitude angle It is 40°,the epoch availability of BDS-2/BDS-3 can still reach 100%,and under the extreme conditions of height angle of B1I and B3I,the pseudo-range single-point positioning accuracy can still meet the general single-point positioning accuracy requirements.Positioning under poor observation environment provides a certain reference significance.