顾及接收机UPD的PPP分步模糊度固定方法

PPP Partial Ambiguity Resolution Method Based on UPD of Receiver

提出一种顾及接收机未校准硬件延迟偏差(uncalibrated phase delays,UPD)的PPP分步模糊度固定方法,利用卫星端UPD产品对观测卫星的浮点模糊度进行改正,采用与整数无关的三角函数进行计算,得到接收机端UPD估计值。基于非差法估计接收机端UPD,根据非差窄巷模糊度协方差大小进行分步模糊度固定,并选取全球225个和14个测站分别作为服务端和用户端进行方法验证。结果表明,与PPP浮点解相比,静态情况下传统方法和新方法定位精度分别提升68.3%和76.4%,收敛时间分别缩短56.3%和69.9%;仿动态情况下传统方法和新方法定位精度分别提升65.7%和84.7%;收敛时间分别缩短61.8%和71.1%,说明新方法可有效提升PPP的定位精度和收敛速度。

We propose a PPP partial ambiguity resolution method based on the UPD(uncalibrated phase delays)of receiver.We correct the float ambiguity using the satellite UPD product,and obtain the UPD of receiver by the trigonometric function independent of integer.We estimate the UPD of receiver based on the undifferenced method,and carry out partial ambiguity resolution according to the undifferenced narrow-lane ambiguity covariance.In order to verify the method,we select a global distributed network of 225 server stations and 14 receiver stations.The results show that,compared with PPP float solution,the positioning accuracy of the traditional method and the new method in static situation is improved by 68.3%and 76.4%respectively,and the convergence time is reduced by 56.3%and 69.9%respectively.The positioning accuracy of the traditional method and the new method in dynamic situation is improved by 65.7%and 84.7%respectively,and the convergence time is reduced by 61.8%and 71.1%respectively.The results indicate that the new method can effectively improve the positioning accuracy and convergence speed of PPP.