高度角对BDS-3与GPS单点定位性能影响分析

Analysis of the Influence of Elevation Angle on the Performance of BDS-3 and GPS Single Point Positioning

为探究高度角对GNSS定位性能的影响,本文进行了BDS-3与GPS在不同高度角情况下单频单点定位解算实验。研究发现,随着高度角的增加,卫星可见数、PDOP值、历元解算率以及定位精度都会变差,而在极端高度角为40°时,B1C、B1I、B2a、B3I、L1、L26个频率由于历元解算率过低不能实现单点定位,而B-B1I、B-B3I 2个频率历元解算率可以达到90%左右,且水平单点定位精度优于2 m,高程单点定位精度优于3 m,可为极端环境下的导航定位提供一定的参考。

Aiming at the influence of elevation angle on GNSS positioning performance,this paper conducts a single-frequency single-point positioning solution experiment for BDS-3 and GPS under different elevation angles.Studies have found that as the elevation angle increases,the number of visible satellites,the PDOP value,the epoch resolution rate,and the positioning accuracy will become worse.When the extreme elevation angle is 40°,B1C,B1I,B2a,B3I,L1,L26 frequencies cannot achieve single-point positioning due to the low epoch resolution rate,while the two-frequency epoch resolution rates of B-B1I and B-B3I can reach about 90%,and the horizontal single-point positioning accuracy is better than 2m.The single-point positioning accuracy of elevation is better than 3m,which can provide a certain reference for navigation and positioning in extreme environments.