This paper focuses on the study of ocean bathymetric inversion from satellite altimeter data by using FFT technique.In this study,the freeair gravity anomalies over the South China Sea are determined by the satellite ...This paper focuses on the study of ocean bathymetric inversion from satellite altimeter data by using FFT technique.In this study,the freeair gravity anomalies over the South China Sea are determined by the satellite altimeter data of GEOSAT,ERS1,ERS2 and T/P.And the 2.5′×2.5′ bathymetry model in South China Sea is calculated from the gravity anomalies with the inversion model given.After the analysis of the inversion and the comparison between the results,some conclusions can be drawn.展开更多
Satellite gravity data fusion with multi-type and huge-amount is one of the hot topics in physical geodesy.After a brief review of dynamic approach,the CHAMP-only and GRACE-only gravity fields by using HL-SST and LL-S...Satellite gravity data fusion with multi-type and huge-amount is one of the hot topics in physical geodesy.After a brief review of dynamic approach,the CHAMP-only and GRACE-only gravity fields by using HL-SST and LL-SST data from 2003 to 2009 are recovered respectively.An combination strategy of CHAMP and GRACE data by using Helmert variance component estimation(VCE) is proposed based on normal equation level fusion.Three gravity field models with 150° and order by CHAMP-only data,GRACE-only data and combining CHAMP and GRACE data from 2003 to 2009 are recovered.The comparisons between our recovered models and those latest released models were performed.The external accuracy validations using marine gravity anomalies from DTU13 products and height anomalies from GPS/leveling data are also conducted in this paper.The results show that long-term CHAMP data do contribute to the accuracy improvement of gravity field solution.The accuracy of the combined model using CHAMP and GRACE data is better than those of the individuals and comparative to the models published by international groups.展开更多
基金supported by the National Natural Science Foundation of China (Grant Nos.42192535,41931076,42274116,42174102)the Basic Frontier Science Research Program of Chinese Academy of Sciences (Grant No.ZDBS-LY-DQC028).
文摘This paper focuses on the study of ocean bathymetric inversion from satellite altimeter data by using FFT technique.In this study,the freeair gravity anomalies over the South China Sea are determined by the satellite altimeter data of GEOSAT,ERS1,ERS2 and T/P.And the 2.5′×2.5′ bathymetry model in South China Sea is calculated from the gravity anomalies with the inversion model given.After the analysis of the inversion and the comparison between the results,some conclusions can be drawn.
基金supported by National Natural Science Foundation of China(Grant No.41574013 and 41174008)National Key Research and Development Program of China(2016YFB0501701)
文摘Satellite gravity data fusion with multi-type and huge-amount is one of the hot topics in physical geodesy.After a brief review of dynamic approach,the CHAMP-only and GRACE-only gravity fields by using HL-SST and LL-SST data from 2003 to 2009 are recovered respectively.An combination strategy of CHAMP and GRACE data by using Helmert variance component estimation(VCE) is proposed based on normal equation level fusion.Three gravity field models with 150° and order by CHAMP-only data,GRACE-only data and combining CHAMP and GRACE data from 2003 to 2009 are recovered.The comparisons between our recovered models and those latest released models were performed.The external accuracy validations using marine gravity anomalies from DTU13 products and height anomalies from GPS/leveling data are also conducted in this paper.The results show that long-term CHAMP data do contribute to the accuracy improvement of gravity field solution.The accuracy of the combined model using CHAMP and GRACE data is better than those of the individuals and comparative to the models published by international groups.
