The adaptive combination adjustment of GNSS and leveling data

doi:10.13474/j.cnki.11-2246.2019.0365

Abstract

Abstract: The combination adjustment is used to adaptively fuse GNSS and leveling by using the leveling height difference value and GNSS vertical velocity as observations. The constrained GNSS leveling points with the consistent movement trend between geodetic height and normal height are uniformly chosen to match the vertical movement. The scale of weight matrix between GNSS and leveling is adaptively computed and adjusted with the variance component estimation. The relative equivalent weight function is adopted to control the influence of the outlier and to improve the accuracy of combination adjustment. The GNSS and second-order leveling data in Shandong province is applied to test the new algorithm. It is shown that the algorithm can not only fuse the velocity of GNSS and leveling, but also improve the reliability of height variety in Shandong province.

Key words: vertical movement, constrain, combination adjustment, data fusion, variance component estimation

CLC Number:

P207

DING Alu, TIAN Jie, NIE Jianliang, LIU Xiaoyun, GUO Xinwei, ZHAO Dajiang, ZHANG Haiping. The adaptive combination adjustment of GNSS and leveling data[J]. Bulletin of Surveying and Mapping, 2019, 0(11): 126-129.

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