The Multi-system Combination PPP Computational Performance Analysis Based on the UofC Model

doi:10.13474/j.cnki.11-2246.2017.0339

Abstract

Abstract: In view of the GNSS system combination for the PPP positioning problem,we deduced the function model and stochastic model of the multi-system combination PPP based on the UofC model,and calculated different combination mode of PPP by using part of the data observed from IGS stations 30 d.The experimental analysis results showed that the GNSS multi-system combination PPP could shorten the convergence time by 30%~50% compared with the GPS system. For positioning accuracy,when the observation time was relatively short (e.g.,0.5 h),the GNSS multi-system combination PPP had better performance,(N,E) direction deviation and standard deviation could reach(0.3,0.3)cm(1.9,4.3)cm respectively,but in a short period of time,U direction accuracy was a bit poor because of the strong correlation of the troposphere parameters and the vertical direction. In addition,under the condition of the satellite altitude cut-off Angle was greater than 40°,single number visible satellite system deficiency leading to continuous cannot locate,but the combined system could still get a good positioning accuracy because it had more visible satellites,which had practical application value in the building concentration areas,mountains and the area where the satellite was seriously blocked.

Key words: UofC model, GNSS, multi-system combination PPP, convergence time, positioning accuracy

CLC Number:

P228

BU Jinwei, CHEN Yunbo, ZUO Xiaoqing, CHANG Jun, LI Xiaolong. The Multi-system Combination PPP Computational Performance Analysis Based on the UofC Model[J]. 测绘通报, 2017, 0(11): 11-16.

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