利用CHAMP科学轨道数据和星载加速度计数据反演地球重力场

Earth's Gravity Field Recovered from CHAMP Science Orbit and Accelerometer Data

摘要: 基于卫星动力学理论,采用德国地球科学中心GFZ提供的CHAMP精密轨道数据和星载加速度计数据,反演了36阶地球重力场模型CDS01S。用不同模型之间的位系数差比较模型CDS01S、EIGEN3P、EIGEN1S及EGM96,表明CDS01S模型的位系数最接近于EIGEN3P;比较上述几种模型的位系数精度,表明CDS01S模型的位系数精度高于EGM96;用CDS01S和GGM01C的前30阶位系数分别计算全球2°×2°网格的大地水准面起伏,两者之间的标准偏差为4.7 cm。

Abstract: AMP satellite.The model that resolves the geoid with an accuracy of better than 4 cm at a resolution of 700 km half-wavelength.By using the degree errors of geopotential coefficients difference to compare the model CDS01S with EIGEN3P,EIGEN1S and EGM96,the result indicates that the CDS01S coefficients are most close to EIGEN3P.Comparing the accuracy of geopotential coefficients in these models,the result indicates the accuracy of coefficients in CDS01S is higher than EGM96.The geoid undulations of CDS01S and GGM01C up to 30 degrees are calculated,the result indicates the standard deviation is 4.7 cm between them.