GRACE卫星关键载荷实测数据的有效处理和地球重力场的精确解算  

Effective processing of measured data from GRACE key payloads and accurate determination of Earth's gravitational field

作　　者：郑伟[1,2] 许厚泽[1] 钟敏[1] 员美娟[3] 周旭华[1] 彭碧波[1] 

机构地区：[1]中国科学院测量与地球物理研究所动力大地测量学重点实验室,武汉430077 [2]日本京都大学防灾研究所 [3]武汉科技大学应用物理系,武汉430081

出　　处：《地球物理学报》2009年第8期1966-1975,共10页Chinese Journal of Geophysics

基　　金：国家自然科学基金(40674038);中国科学院知识创新工程重要方向项目(KZCX2-YW-143;KZCX2-YW-202);国家高技术研究发展计划(863)(2009AA1 2Z138;2006AA09Z153);日本JSPS基盘研究项目(B19340129)资助

摘　　要：首先对美国喷气推进实验室(JPL)公布的2007-06-01～2007-12-31时间段内的GRACE Level 1B卫星GPS轨道位置和速度、K波段系统星间速度、加速度计非保守力以及恒星敏感器姿态实测数据对应进行了轨道拼接、粗差探测、线性内捅、重新标定、坐标转换、误差分析等有效处理;其次,基于改进的能量守恒法恢复了120阶GRACE地球重力场,在1 20阶处累计大地水准面精度为25.313 cm;最后,检验了本文地球重力场模型IGG-GRACE的可靠性,同时分析了IGG GRACE解算精度在低频部分略优于德国波兹坦地学研究中心(GFZ)公布的EIGEN-GRACE02S地球重力场模型,而在中高频部分略低的原因.Firstly, the GRACE Level 1B measured data including the orbital position and velocity of GPS receiver, intersatellite range rate of K-band ranging system, nonconservative force of accelerometer and attitude of star camera assembly between 2007-06-01～2007-12-31 provided by the American Jet Propulsion Laboratory （JPL） are processed effectively by orbital connection, gross error detection, linear interpolation, recalibration, coordinate transformation, error analysis, and so on. Secondly, the GRACE Earth＇s gravitational field complete up to degree and order 120 is recovered based on the improved energy conservation principle, the cumulative geoid height error is 25.313 cm at degree 120. Finally, the dependability of the Earth＇s gravitational field model IGG-GRACE is verified in the paper, and the reasons why the accuracy of IGG-GRACE is a little superior to the Earth＇s gravitational field model EIGEN-GRACE02S provided by the German GeoForschungsZentrum Potsdam （GFZ） in the low frequency range and is slightly lower than that in the medium-high frequency band are analyzed.

关 键 词：GRACE 关键载荷 实测数据 能量守恒法 地球重力场 

分 类 号：P223[天文地球—大地测量学与测量工程]