不同截止高度角下BDS-3 SPP精度分析  

SPP accuracy analysis of BDS-3 under different masking angles

作　　者：朱玉香 陈永贵 安春华[2] ZHU Yuxiang;CHEN Yonggui;AN Chunhua(Henan Collage of Surveying and Mapping,Zhengzhou 451464,China;Institute of Geography,Henan Academy of Sciences,Zhengzhou 450052,China)

机构地区：[1]河南测绘职业学院,河南郑州451464 [2]河南省科学院地理研究所,河南郑州450052

出　　处：《测绘通报》2021年第3期23-27,共5页Bulletin of Surveying and Mapping

基　　金：河南省高等学校重点科研项目(20B170002);河南省高校人文社会科学研究项目(2021-ZZJH-035)。

摘　　要：针对卫星可见数与历元可用率较低情况下的BDS-3定位性能,本文基于MEGX跟踪站BDS-3与GPS实测数据,分析了不同高度角(10°、20°、30°、40°)下BDS-3卫星B1I、B1C、B2a、B3I,以及GPS系统L1频率的单点定位(SPP)精度。研究发现,BDS-3平均卫星可见数与卫星空间几何构型优于GPS,且随着高度角的增加呈线性变化。BDS-3的4个频率的SPP精度随着高度角的增加呈先增加后降低的趋势,高度角为20°时,定位精度最高,高度角达到40°时,定位精度最低,且历元可用率也最低;但B1I和B3I历元可用率仍大于90%,而B1C和B2a历元可用率大于70%;不论是SPP定位精度还是历元可用率,均优于GPS系统L1频率。Aiming at the BDS-3 positioning performance under the condition of low satellite visibility and epoch availability,this paper analyzes different altitude angles( 10°,20°,30°,BDS-3 and GPS measured data from MEGX tracking station). 40°) SPP positioning accuracy of BDS-3 satellites B1I,B1C,B2a,B3I and GPS system L1 frequency. It is found through research that the average number of visible satellites and satellite spatial geometry of BDS-3 are better than GPS,and it changes linearly with the increase of the altitude angle. The SPP positioning accuracy of the four frequencies of BDS-3 increases first and then decreases with the increase of the altitude angle. When the altitude angle is 20°,the positioning accuracy is the highest. When the altitude angle reaches 40°,the positioning accuracy is the lowest,and the epoch availability rate is also the lowest. But the availability rate of the B1I and B3I epochs is still greater than 90%,while the availability rate of the B1C and B2a epochs is greater than 70%. Both the SPP positioning accuracy and the epoch availability are better than the GPS system L1 frequency.

关 键 词：BDS-3 SPP 不同高度角 历元可用率 

分 类 号：P228[天文地球—大地测量学与测量工程]