Short-term GNSS network solution and performance in large height difference region with tropospheric delay constraint

doi:10.11947/j.AGCS.2022.20210448

Abstract

Abstract: The observation of GNSS monitoring in mountain area is often severely restricted by tropospheric delay, resulting in the reduction of positioning accuracy. In this paper, a constraint method for the prior information of tropospheric delay at ground points is put forward to realize the fast and high-precision double differenced observation of the peak. This method can make full use of the augmentation information of tropospheric delay of long-distance ground station, the observation duration decreased notably,increase the stations range of mountain monitoring, so as to reduce costs of mountain measurement task. In this paper, the applicability is verified by the spatio-temporal characteristics of observation duration, baseline distance and number of ground stations. The experimental results indicate that takes the high-precision tropospheric delay into account as prior constraints, acquired by long-time GNSS observation at ground stations, which can weaken the influence of tropospheric delay residuals efficiently induced by large heights different between different stations and improve success rate of ambiguity fixing, and can achieve tropospheric delay parameter estimation and fast high-precision positioning of peak monitoring points. Compared with the unconstrained method, the accuracy of each coordinate component is improved after the troposphere prior constraints, and the accuracy of the elevation direction is improved significantly.

Key words: large height difference, tropospheric delay, mountain area, spatio-temporal characteristics

CLC Number:

P228

JIANG Guangwei, WANG Panlong, GUO Chunxi, WANG Bin, YANG Yuanxi. Short-term GNSS network solution and performance in large height difference region with tropospheric delay constraint[J]. Acta Geodaetica et Cartographica Sinica, 2022, 51(11): 2255-2264.

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