北斗三号新三频相位模糊度固定方法

BDS-3 New Triple-frequency Carrier Ambiguity Resolution Method

针对北斗三号新的三频观测值,通过分析BDS-3三频线性组合观测值特性,选取高质量组合观测值,采用无几何相关GF(Geometry-Free)模型和无几何无电离层相关GIF(Geometry-Ionospheric-Free)模型分别对实测BDS-3卫星数据进行单历元三频相位模糊度解算TCAR(Triple-frequency Carrier Ambiguity Resolution)。试验结果表明,短基线时GF模型模糊度误差都在0.5周以内,且模糊度固定成功率都在88.43%以上;中长基线时GF模型模糊度固定能力明显降低,宽巷下降到73.47%,窄巷也只有25.44%。GIF模型在中长基线解算时相比于GF模型具有更好的模糊度固定能力。中长基线GIF模型宽巷模糊度固定成功率达85.31%,相对于GF模型提高了13%。中长基线GIF模型窄巷模糊度固定成功率在43.58%以上,相对于GF模型提高了51%。

According to the new triple-frequency observations of BDS-3,characteristics of the triple-frequency linear combination observations of BDS-3 are firstly analyzed,and then the high-quality combined observations are selected,finally geometry-free(GF)model and geometry-ionospheric-free(GIF)model are adopted to perform single-epoch triple-frequency carrier ambiguity resolution(TCAR)on the BDS-3 data.Experimental results show that ambiguity errors of GF model is within 0.5 cycles for the short baseline,and the ambiguity resolution success rates are higher than 88.43%.For the medium-long baseline,the ambiguity resolution success rate of GF model reduces significantly,as wide lane drops to 73.47%and narrow lane to 25.44%.Comparing with GF model,GIF model has a better ambiguity fixing ability when solving for the medium-long baseline.The ambiguity resolution success rate of wide lane is above 85.31%,which is 13%higher than that of the GF model,and narrow lane above 43.58%,which is 51%higher than that of GF model.