基于EGM2008重力场模型的地质高程拟合研究
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摘要
为了解决GPS大地高不能直接应用于工程实践的问题,快速而准确地实现大地高向正常高的转换,采用EGM2008重力场模型对地质高程拟合进行了研究。根据重力场的计算流程以及移去恢复法原理,选取丘陵和平原研究区的数据进行拟合试验,研究分别采用了移动曲面拟合法以及二次曲面拟合法进行了拟合;结合EGM2008重力场模型进行分析对比。研究得出:加入重力场后,基于EGM2008模型的拟合精度得到很大的提高,基于重力场的移动曲面法的精度比基于重力场的二次曲面法的精度高,拟合精度满足工程测量的要求,该方法提高了工作效率,具有很高的应用价值。
In order to solve the GPS geodetic problem cannot be directly applied to engineering practice and realize the geodetic normal high conversion the fast and accurately,geological elevation fitting was studied by using EGM2008 gravity field model. According to the calculation of the gravitational field flow and remove the restoration method principle,hilly and plain data fitting experiment was selected to carry out in the study area. The moving curved surface fitting method and the conicoid fitting method were used to simulate,and then combined with comparing the EGM2008 gravity field model. Results of study showed that,after joining the gravity field,the fitting precision of model based on EGM2008 have been greatly improved,the precision of moving curved surface fitting method in gravitational field is better than that of the conicoid fitting method. The fitting precision can meet the requirements of engineering survey,and this method improves the work efficiency,has very high application value.
In order to solve the GPS geodetic problem cannot be directly applied to engineering practice and realize the geodetic normal high conversion the fast and accurately,geological elevation fitting was studied by using EGM2008 gravity field model. According to the calculation of the gravitational field flow and remove the restoration method principle,hilly and plain data fitting experiment was selected to carry out in the study area. The moving curved surface fitting method and the conicoid fitting method were used to simulate,and then combined with comparing the EGM2008 gravity field model. Results of study showed that,after joining the gravity field,the fitting precision of model based on EGM2008 have been greatly improved,the precision of moving curved surface fitting method in gravitational field is better than that of the conicoid fitting method. The fitting precision can meet the requirements of engineering survey,and this method improves the work efficiency,has very high application value.
引文
[1]朱君俊.基于重力场模型EGM2008的高程拟合方法研究[D].呼和浩特:内蒙古农业大学,2012.
[2]刘成,张幸福. EGM2008重力场模型在GPS高程拟合中的应用分析[J].铁道勘察,2009,35(1):1-3.Liu Cheng,Zhang Xinfu. Application and analysis of EGM2008gravity field model in GPS elevation fitting[J]. Railway Investigation and Surveying,2009,35(1):1-3.
[3]刘斌,郭际明,史俊波,等.利用EGM2008模型与地形改正进行GPS高程拟合[J].武汉大学学报(信息科学版),2016,41(4):554-558.Liu Bin,Guo Jiming,Shi Junbo,et al. GPS elevation fitting by using EGM2008 model and topographic correction[J]. Geomatics and Information Science of Wuhan University,2016,41(4):554-558.
[4]程怀远.顾及EGM2008重力场模型的GPS高程拟合研究[J].全球定位系统,2014(1):82-84.Cheng Huaiyuan. Study on GPS elevation fitting of EGM2008 gravity field model[J]. GNSS World of China,2014(1):82-84.
[2]刘成,张幸福. EGM2008重力场模型在GPS高程拟合中的应用分析[J].铁道勘察,2009,35(1):1-3.Liu Cheng,Zhang Xinfu. Application and analysis of EGM2008gravity field model in GPS elevation fitting[J]. Railway Investigation and Surveying,2009,35(1):1-3.
[3]刘斌,郭际明,史俊波,等.利用EGM2008模型与地形改正进行GPS高程拟合[J].武汉大学学报(信息科学版),2016,41(4):554-558.Liu Bin,Guo Jiming,Shi Junbo,et al. GPS elevation fitting by using EGM2008 model and topographic correction[J]. Geomatics and Information Science of Wuhan University,2016,41(4):554-558.
[4]程怀远.顾及EGM2008重力场模型的GPS高程拟合研究[J].全球定位系统,2014(1):82-84.Cheng Huaiyuan. Study on GPS elevation fitting of EGM2008 gravity field model[J]. GNSS World of China,2014(1):82-84.