GRACE精密星间重力位差数据集(2002年4月至2016年7月)  

A dataset of GRACE intersatellite geopotential differences from April,2002 to July,2016

作　　者：钟波[1] 李琼 陈剑利[3] 罗志才 ZHONG Bo;LI Qiong;CHEN Jianli;LUO Zhicai(School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,P.R.China;School of Civil Engineering and Geomatics,Southwest Petroleum University,Chengdu 610500,P.R.China;Center for Space Research,University of Texas at Austin,Austin,TX 78759,USA;MOE Key Laboratory of Fundamental Physical Quantities Measurement,School of Physics,Huazhong University of Science and Technology,Wuhan 430074,P.R.China)

机构地区：[1]武汉大学,测绘学院,武汉430079 [2]西南石油大学,土木工程与测绘学院,成都610500 [3]美国德克萨斯大学奥斯汀分校,空间研究中心,德克萨斯州奥斯汀787594 [4]华中科技大学,物理学院,基本物理量测量教育部重点实验室,武汉430074

出　　处：《中国科学数据（中英文网络版）》2022年第2期158-167,共10页China Scientific Data

基　　金：国家自然科学基金(41974015、41474019)

摘　　要：GRACE(Gravity Recovery and Climate Experiment)星间重力位差是一种沿卫星轨道的原位观测量,它具有明显的地球物理含义。本研究基于改进的能量平衡方程和移去恢复技术RCR(remove-compute-restore),利用GRACE Level-1B核心载荷数据(KBR星间距离变率、卫星精密轨道、非保守力加速度计和卫星姿态等数据)估计了2002年4月至2016年7月期间的精密星间重力位差数据,并通过数据质量控制手段对估计结果进行了质量标记。这些数据按月进行存储,共有155个月的数据文件,提供了GRACE双星A和B的地心地固坐标、扣除平均重力场(GGM05C模型)的星间重力位差和质量标记等数据。同时,将GRACE星间重力位差反演的时变重力场和地表质量变化模型与官方发布模型进行比较,验证了数据集的可靠性。本数据集进一步丰富了GRACE数据产品的种类,可为静态和时变重力场建模、全球和局部地表质量变化反演及相关地学应用研究提供有力的数据支撑。Gravity Recovery and Climate Experiment(GRACE)intersatellite geopotential differences are in-situ gravimetric observables with explicit geophysical interpretation.Based on the improved energy balance equation and remove-compute-restore(RCR)technique,we estimated the precise intersatellite geopotential differences from April,2002 to July,2016 from GRACE Level-1B data(including K-band ranging(KBR)range-rate,satellite orbits,accelerometer and attitude measurements),and marked the estimate results by means of data quality control method.The dataset includes 155 data files with monthly interval,and each data file includes the positions of GRACE satellites A and B in Earth-centered Earth-fixed(ECEF)coordinate system,intersatellite geopotential difference after deducting the mean gravity field model(i.e.,GGM05C),and the corresponding quality flags.Furthermore,the reliability of the dataset is validated by comparing the time variable gravity field and surface mass change models retrieved by GRACE intersatellite geopotential differences with the official released models.This dataset further enriches the GRACE data products,and can provide data support for static and time-varying gravity field modeling,global and regional surface mass change inversion,as well as related studies in geoscience.

关 键 词：GRACE 星间重力位差 改进的能量平衡方程 Level-1B数据 地表质量变化 

分 类 号：P223[天文地球—大地测量学与测量工程]