基于天琴一号观测数据反演地球重力场模型  

Earth′s gravity field determination based on Tianqin-1 observations

作　　者：周浩 罗志才[1,2] 周泽兵 谷德峰 涂良成[3] ZHOU Hao;LUO Zhicai;ZHOU Zebing;GU Defeng;TU Liangcheng(Center for Gravitational Experiment,School of Physics,Huazhong University of Science and Technology,Hubei Wuhan,430074;National Precise Gravity Measurement Facility,Hubei Wuhan,430074;Tianqin Research Center,Sun Yat-Sen University,Guangdong Zhuhai,519082)

机构地区：[1]华中科技大学物理学院引力中心,湖北武汉430074 [2]华中科技大学精密重力测量国家重大科技基础设施,湖北武汉430074 [3]中山大学天琴中心,广东珠海519082

出　　处：《华中科技大学学报（自然科学版）》2022年第9期117-125,共9页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(41931074,42074018,42061134007)。

摘　　要：天琴一号卫星搭载了静电悬浮加速度计、GNSS接收机和星象仪,可实现地球重力场探测的高低卫星跟踪卫星技术.这里利用自主研制的动力法反演软件,采用天琴一号(TQ-1:Tianqin-1)30 h观测数据反演了截断至15阶次的静态地球重力场模型,计算结果表明:TQ-1卫星数据反演的地球重力场模型在15阶次内的信噪比均大于1,说明利用TQ-1数据具备实现15阶次地球重力场的反演能力;通过与包含8 a高低卫星跟踪卫星观测信息的AIUB-CHAMP03S模型对比可知,利用TQ-1卫星数据反演的地球重力场模型位系数误差整体优于10^(-8)量级;通过与包含13 a低低卫星跟踪卫星观测信息的HUST-Grace2016s模型对比可知,利用TQ-1卫星数据反演的地球重力场模型可获取全球格网重力异常和全球格网大地水准面信息,二者空间分布特征较为一致.计算结果为采用我国自主研发的高低卫星跟踪卫星技术获得的首个地球重力场模型,表明我国具备了采用该技术获取地球重力场模型的能力,可为发展我国自主研发的重力卫星提供重要技术参考.Tianqin-1(TQ-1)mission is equipped with electrostatic accelerometer,GNSS receiver and star camera,which can be used to detect Earth′s gravity field via high-low satellite-to-satellite tracking(HL-SST)technology.In this study,a software was developed to determine gravity field model with dynamic approach,and determined a static gravity field model truncated to 15 degree and order by 30-hours TQ-1 observations.The signal-to-noise ratio of the TQ-1 model is larger than 1 before degree 15,which indicates the capacity of TQ-1 mission in determining static gravity field signals before degree 15.Comparing with the AIUBCHAMP03 s model(determined by 8 a HL-SST observations),the coefficient errors of TQ-1 model are all smaller than 10^(-8).Comparing with the HUST-Grace2016s model(determined by 13 a low-low satellite-to-satellite tracking observations),the TQ-1 model present the similar spatial distribution of global gravity anomalies and geoids.The result is the first self-developed earth′s gravity field model via the independently developed HL-SST technology in China,indicating that China has the ability to obtain the earth′s gravity field model on the basis of HL-SST technology,which provides an important technical reference for the independently developed gravity satellites in China.

关 键 词：天琴一号 地球重力场 加速度计 动力法 卫星重力 

分 类 号：P223[天文地球—大地测量学与测量工程]