第二代星基增强系统GATBP的PPP服务模糊度固定效果

Ambiguity Fixing Effect of PPP Service Provided by the Second Generation Satellite-Based Augmentation System GATBP

为验证第二代星基增强系统GATBP PPP服务的模糊度固定效果,使用与观测值相关的信号偏差改正数对卫星硬件延迟进行改正,利用LAMBDA方法分别固定宽巷和窄巷模糊度,获得固定的单差无电离层组合模糊度。使用GATBP精密产品对10个MGEX测站7 d的观测数据进行PPP解算,并与CODE精密产品解算结果对比。结果表明,使用GATBP产品的宽巷和窄巷模糊度固定率平均值分别为95%和30.2%,水平方向定位误差RMS优于10 cm,三维定位误差RMS优于15 cm,相位观测值残差RMS优于3 cm,对流层估计误差RMS优于1.5 cm;使用CODE产品的宽巷和窄巷模糊度固定率平均值均在95%以上,相位观测值残差、定位误差和对流层估计误差均显著小于GATBP产品。

To verify the ambiguity fixing effect of the second generation SBAS experimental platform GATBP PPP service,we correct the satellite hardware delay using the signal deviation correction number associated with the observations,and fix the wide and narrow aisle ambiguities separately using the LAMBDA method to obtain the fixed single-difference ionosphere-free combined ambiguity.We solve the 7 d observations of 10 MGEX stations by PPP using GATBP precision products,and use the results of CODE precision products as reference.The results show that the mean fixed rate of ambiguity for wide and narrow lanes using GATBP products is 95%and 30.2%,respectively,the RMS of horizontal positioning error is better than 10 cm,the RMS of 3D positioning error is better than 15 cm,the RMS of phase observation residuals is better than 3 cm,and the RMS of tropospheric estimation error is better than 1.5 cm.The ambiguity fixed rates of both wide and narrow lanes are above 95%for CODE products,and the residuals of phase observation,positioning errors and tropospheric estimation errors are significantly smaller than those of the former.