Vertical deformation analysis based on combined adjustment for GNSS and leveling data

IF 2.8 4区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Geodesy and Geodynamics Pub Date : 2023-09-01 DOI:10.1016/j.geog.2023.03.003

Jianliang Nie , Jie Tian , Xinwei Guo , Bin Wang , Xiaoyun Liu , Yaxuan Cheng , Pengtao Jiao

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引用次数: 0

Abstract

A method is proposed to fuse the velocity data of the global navigation satellite system (GNSS) and leveling height via combined adjustment with constraints. First, stable GNSS–leveling points are uniformly selected, and the constraints of the geodetic height change velocity and normal height change velocity are given. Then, the GNSS vertical velocities and leveling height difference are used as observations of combined adjustment, and robust least-squares estimation are used to estimate the velocities of the unknown points. Finally, a vertical movement model is established with the GNSS vertical velocities and leveling vertical velocities obtained via combined adjustment. Data from the second-order leveling network and GNSS control points in Shandong Province are taken as test data, and eight calculation schemes are used for discussion. One of the schemes, the bifactor robust combined adjustment method based on variance component estimation with two kinds of vertical velocity constraints achieves the optimal results. The method applied in the scheme can be recommended for data fusion of GNSS and leveling, further improving the reliability of vertical crustal movement in Shandong Province.

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基于GNSS和水准测量数据组合平差的垂直变形分析

提出了一种结合约束平差的全球卫星导航系统(GNSS)速度数据与水准高度数据融合的方法。首先，均匀选取稳定的gnss水准点，给出大地高程变化速度和法向高程变化速度的约束条件;然后，利用GNSS垂直速度和水准高差作为联合平差的观测值，利用鲁棒最小二乘估计方法估计未知点的速度;最后，利用组合平差得到的GNSS垂直速度和水准垂直速度，建立垂直运动模型。以山东省二级水准网和GNSS控制点数据为试验数据，采用8种计算方案进行讨论。其中，基于方差分量估计和两种垂直速度约束的双因子鲁棒组合平差方法达到了最优效果。该方案所采用的方法可推荐用于GNSS和水准测量的数据融合，进一步提高山东省地壳垂直运动的可靠性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geodesy and Geodynamics GEOCHEMISTRY & GEOPHYSICS-

CiteScore

4.40

自引率

4.20%

发文量

566

审稿时长

69 days

期刊介绍： Geodesy and Geodynamics launched in October, 2010, and is a bimonthly publication. It is sponsored jointly by Institute of Seismology, China Earthquake Administration, Science Press, and another six agencies. It is an international journal with a Chinese heart. Geodesy and Geodynamics is committed to the publication of quality scientific papers in English in the fields of geodesy and geodynamics from authors around the world. Its aim is to promote a combination between Geodesy and Geodynamics, deepen the application of Geodesy in the field of Geoscience and quicken worldwide fellows'' understanding on scientific research activity in China. It mainly publishes newest research achievements in the field of Geodesy, Geodynamics, Science of Disaster and so on. Aims and Scope: new theories and methods of geodesy; new results of monitoring and studying crustal movement and deformation by using geodetic theories and methods; new ways and achievements in earthquake-prediction investigation by using geodetic theories and methods; new results of crustal movement and deformation studies by using other geologic, hydrological, and geophysical theories and methods; new results of satellite gravity measurements; new development and results of space-to-ground observation technology.