Correction of system bias between large-area GNSS leveling and gravity field model

doi:10.13474/j.cnki.11-2246.2020.0252

Bulletin of Surveying and Mapping ›› 2020, Vol. 0 ›› Issue (8): 76-80.doi: 10.13474/j.cnki.11-2246.2020.0252

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Correction of system bias between large-area GNSS leveling and gravity field model

CHEN Jianhua, WEI Dehong, ZHANG Xingfu, LI Weichao

Departments of Surveying and Mapping, Guangdong University of Technology, Guangzhou 510006, China

Received:2020-04-24 Revised:2020-06-11 Online:2020-08-25 Published:2020-09-01

Abstract

Abstract: Large-area GNSS leveling data is important independent data sources for estimating the accuracy of the gravity field model. Generally, the system bias is caused by the geoid difference between the large-area GNSS leveling and gravity field model, which has an effect on estimating the accuracy of the gravity field model by directly using GNSS leveling data. Taking the 24 152 US GNSS leveling data to estimate EIGEN-6C4 model as an example, this paper proposes to use the divisional constant system bias correction method and the four/five/seven -parameters correction method to correct the system bias between GNSS leveling and gravity field model. The results show that the system bias can be determined and effectively corrected by using the correction method of the bias of the constant system and four/five/seven-parameters method. After correcting the system bias, the accuracy of 2160 degree EIGEN-6C4 model in the US is better than 10 cm.

Key words: GNSS leveling, gravity field model, accuracy estimation, systematic bias, method of parameters

CLC Number:

P223

CHEN Jianhua, WEI Dehong, ZHANG Xingfu, LI Weichao. Correction of system bias between large-area GNSS leveling and gravity field model[J]. Bulletin of Surveying and Mapping, 2020, 0(8): 76-80.

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Correction of system bias between large-area GNSS leveling and gravity field model

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