| 一种更加严密的GNSS台站位移热弹性效应模型 |
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| 引用本文： | 方柳,明锋,任红飞.一种更加严密的GNSS台站位移热弹性效应模型[J].大地测量与地球动力学,2022,42(3):298-302. |
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| 作者姓名： | 方柳 明锋 任红飞 |
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| 作者单位： | 地理信息工程国家重点实验室,西安市雁塔路中段 1 号,710054;西安测绘研究所,西安市雁塔路中段 1 号,710054 |
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| 基金项目： | 国家重点实验室开放基金;国家自然科学基金 |
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| 摘 要： | GNSS基准站天线观测墩及其所在基岩会随地表温度变化产生热弹性形变,并累积为GNSS台站的位移.热弹性效应的定量分析对于准确分离GNSS基准站坐标时间序列中的信号和噪声具有重要意义.基于弹性力学和热弹性力学的相关理论,给出一维温度场下轴对称观测墩热弹性形变的解析解.结果表明,观测墩的垂向位移由观测墩和基岩的泊松比、热膨...
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| 关 键 词： | 热弹性效应 GNSS基准站 非线性信号 解析解 |
A More Rigorous Thermoelastic Effect Model of Displacement of GNSS Station |
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| FANG Liu,MING Feng,REN Hongfei.A More Rigorous Thermoelastic Effect Model of Displacement of GNSS Station[J].Journal of Geodesy and Geodynamics,2022,42(3):298-302. |
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| Authors: | FANG Liu MING Feng REN Hongfei |
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| Institution: | (State Key Laboratory of Geo-Information Engineering,1 Mid-Yanta Road,Xi’an 710054,China;Xi’an Research Institute of Surveying and Mapping,1 Mid-Yanta Road,Xi’an 710054,China) |
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| Abstract: | The temperature of GNSS monument and the bedrock can be influenced by surface air temperature changes,which results in thermoelastic deformation and accumulates as displacement of GNSS station.The quantity analysis on thermoelastic effect is important in separating accurately the signals and noises in coordinate time series of GNSS reference stations.In this paper,based on correlation theory of elastic mechanics and thermoelastic mechanics,we give the analytical solution thermoelastic deformation of axisymmetric monument under one-dimensional temperature field.Results suggest that the vertical displacement of monument is dependent on the Poisson’s ratio,thermal expansion coefficient,temperature difference and the height of the monument and bedrock.We propose a more rigorous thermoelastic effect model,with the vertical displacement of GNSS station caused by temperature changes being considered in three parts:the displacement of aboveground part of the monument,underground part of that,and the bedrock.We compare the difference between the proposed model and literature results. |
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| Keywords: | thermoelastic effect GNSS reference stations non-linear signal analytical solution |
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