不同截止高度角GPS/BDS组合伪距差分定位性能分析

Performance analysis of GPS/BDS pseudo-range differential positioning with different cut-off height angles

针对在不同截止卫星高度角时,GPS,BDS,GPS/BDS系统间伪距差分定位精度的差异,文中对多系统融合伪距差分定位的数学模型方法进行研究。以香港CORS站6.9km和34.0km的两条基线为例,在截止卫星高度角10°、20°、30°、40°的情况下,进行GPS,BDS,GPS/BDS伪距差分基线解算。结果表明,与34.0km基线相比,6.9km基线伪距差分定位具有更高的精度,在不同截止高度角下,GPS/BDS组合系统在E,N,U方向的定位精度都优于单GPS,BDS系统,且定位结果更加稳定,特别在截止高度角为40°的极端条件下,GPS/BDS组合伪距差分定位精度仍能达到m级左右。

In view of the difference of pseudo range differential positioning accuracy between GPS,BDS and GPS/BDS systems at different cut-off height of satellite,this paper studies the mathematical model of multi-system fusion pseudo range differential positioning.Taking the two baselines of 6.9 km and 34.0 km in Hong Kong CORS station as examples,the GPS,BDS,GPS/BDS pseudo-range difference baseline solution is obtained at the height of 10°,20°,30°and 40°.The result shows that,compared with the baseline 34.0 km,baseline 6.9 km pseudo range differential positioning has higher precision in different cut-off angle,E,N,and U located in the direction of the accuracy of GPS/BDS system are better than the single GPS,BDS system;the positioning results are more stable,especially in the cut-off angle for extreme conditions 40 the combination of GPS/BDS degrees,for which GPS/BDS combination pseudo-range differential positioning accuracy can still reach m level.