摘要
由于GRACE-FO卫星的K波段星间精密测距载荷工作时受到电离层影响,导致星间距离数据不可避免地含有电离层延迟误差,影响重力场反演精度.为深入分析电离层延迟效应对星间距离变化率及重力场反演的影响,利用2019年1月的GRACE-FO卫星Level-1A级数据自主实现KBR1B产品预处理过程,分别解算不考虑电离层延迟的K/Ka单频星间距离和双频消电离层延迟的星间距离,并导出星间距离变化率,解算了60阶次的重力场模型,结果分析表明:不进行电离层延迟改正得到的星间距离变化率和K波段测距系统(KBR)双频测距消除电离层延迟的星间距离变化率的差异约为2.0×10^(-5)m/s,不满足星间距离变化率的精度要求,影响重力场模型尤其是中高阶位系数的解算精度,且随着阶次的增加影响越大;此外自主处理的星间距离结果与美国喷气动力实验室提供的结果精度相当.
Ionospheric delay error is contained in the inter-satellite range because electromagnetic wave signals emitted by the K-Band ranging system(KBR)of GRACE-FO satellites are affected by the ionosphere,and a non-negligible effect on the recovery of the gravity field model will made by ionospheric delay errors.In order to analyze the influence of ionospheric delay effect on the inter-satellites range rate and the recovery of the gravity field model,the pretreatment process of KBR1B product was independently realized by using the Level-1A data products of GRACE-FO in January 2019.The inter-satellite range rate contains ionospheric delay errors,non-ionospheric inter-satellite range rate and static gravity field models up to degree and order 60 were computed and the analyzed results show that the difference of inter-satellite range rate contains ionospheric delay errors and non-ionospheric inter-satellite range rate near to 2.0×10^(-5)m/s,greater than requirement of accurate of range rate,make a non-negligible effect on the recovery of the gravity field model and mainly degrade the recovery of mid-and high-degree gravity coefficients.Finally,it can be validated that our independent range rate products are comparable to those provided by the Jet Propulsion Laboratory.
作者
邱丽明
陈秋杰
张兴福
沈云中
陈鑑华
QIU Liming;CHEN Qiujie;ZHANG Xingfu;SHEN Yunzhong;CHEN Jianhua(College of Surveying and Geo-lnformatics,Tongji University,Shanghai 200092,China;Departments of Surveying and Mapping,Guangdong University of Technology,Guangzhou 510006,China)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2022年第9期134-140,共7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(42192532,42174099)
国家重点研发计划资助项目(2021YFB3900101)。
