遮挡环境下BDS/GPS等权组合载波相位时间传递方法

BDS/GPS Equal-weight Combined Carrier Phase Time Transfer Method in Occlusion Environment

给出了BDS/GPS组合载波相位时间传递的数学模型,通过设置不同的高度截止角来模拟遮挡环境,对比分析BDS、GPS和BDS/GPS在不同遮挡环境中的时频传递效果。结果表明:当单系统可视卫星较多时,BDS/GPS时频传递性能相比单系统并没有明显提高;当高度截止角高大于30°时,单系统由于可见卫星数不足无法实现连续的时频传递,而BDS/GPS组合仍然可以获得连续的时频传递结果,时频传递的稳定性和收敛速度明显优于单系统。这对于深露天煤矿、城市峡谷等遮挡严重的区域具有十分重要的应用价值。

The time transfer model is given using BDS/GPS observations,and the results of time and frequency transfer under different cut-off elevation angles are compared between BDS,GPS and BDS/GPS.Experimental results show that the performance of BDS/GPS time and frequency transfer result is not significantly improved compared to the single system when the number of available satellites is enough.However,when the cut-off elevation angle is larger than 30 degrees,the single system can’t get continuous time and frequency transfer results,but the BDS/GPS combination can still obtain continuous results.Compared to single system method,both the stability and convergence time are improved.This has a very important application value in some special conditions,for instance,deep open pit mines and urban canyons when not all satellites are visible.