不同截止高度角BDS/GPS伪距单点定位性能分析

Performance assessment of BDS/GPS pseudo-range single point positioning with different cut-off elevation angles

针对在不同截止高度角的情况下,BDS单系统、GPS单系统和BDS/GPS组合系统三者伪距单点定位的精度差异,该文对三者伪距单点定位的数学模型和不同误差的处理方法进行了研究。分别进行了BDS单系统、GPS单系统和组合系统在截止高度角分别为15、30、50°时伪距单点定位的数据处理实验。结果表明,15°和30°时,组合系统在E、N、U各方向上的定位结果较单系统平稳,定位精度优于单系统;单系统在截止高度角为50°时不能定位或定位结果不可靠,而组合系统仍能达到定位要求。

In view of different cut-off elevation angles,the accuracy difference of the three pseudorange single point positioning of BDS single system,GPS single system and BDS/GPS combination system,the mathematical model and the processing methods of different error of three pseudo-range single point positioning were studied in the paper.And then experiments of data processing for BDS single system,GPS single system and BDS/GPS combination system pseudo-range single point positioning were addressed with 15°,30°and 50°cut-off elevation angles.The results showed that when cut-off elevation angle was 15°or 30°,the positioning results of the combined system in E,Nand U were more stable than that of the single system,and the positioning accuracy was better than that of the single system.When the single system cannot be positioned or the result was not reliable at the cut-off angle of 50°,the combined system can still meet the positioning requirements.