摘要
GRACE-D(Gravity Recovery and Climate Experiment Follow-on D)卫星由于加速度计测量噪声过大导致其数据不可用,为了建立高精度的地球重力场模型,需对GRACE-D卫星加速度计数据进行重构.本文独立估计了推进器峰值校正模型参数,并顾及姿态旋转改正和时标改正,移植得到GRACE-D卫星加速度计数据,用于时变重力场模型解算分析.分析结果表明:从时间序列看来,本文移植生成的ACT1A与美国喷气推进实验室JPL(Jet Propulsion Laboratory)发布的ACT1A产品三轴差值标准差分别为3.36×10^(-11)m·s^(-2)、7.34×10^(-12)m·s^(-2)和2.28×10^(-12)m·s^(-2),低于加速度计观测精度(非灵敏轴测量精度10^(-9) m·s^(-2),灵敏轴测量精度10^(-10) m·s^(-2)).从功率谱密度来看,本文移植生成的GRACE-D卫星ACT1A和ACT1B产品与JPL产品精度相当;从重力场解算结果来看,利用本文加速度计移植产品解算的重力场模型大地水准面阶误差与JPL产品十分吻合,两者的重力异常和等效水高的差值标准差分别优于5.78×10^(-4)mGal和1.5 cm.以上结果表明本文移植的GRACE-D卫星加速度计数据与JPL产品精度相当,相关算法和结果能够为我国重力卫星将来迈入老化期时,建立加速度计移植预案提供一定的参考价值.
The accelerometer data of GRACE-D(Gravity Recovery and Climate Experiment Follow-on D)satellite cannot be used for gravity field estimation due to its significant measurement noise.To ensure the accuracy of Earth′s gravity field models,it is necessary to reconstruct the GRACE-D accelerometer data.In this paper,we independently estimated the parameters of the thruster spike model and transplanted the GRACE-D accelerometer data from GRACE-C accelerometer measurements.During the transplantation of accelerometer data,attitude rotation correction and time correction are applied.The analysis results show that:(1)In terms of time series,the standard deviations of GRACE-D ACT1A accelerometer data generated in this study relative to those released by the Jet Propulsion Laboratory(JPL)are 3.36×10^(-11)m·s^(-2),7.34×10^(-12)m·s^(-2)and 2.28×10^(-12)m·s^(-2)respectively,which are lower than the accuracy of accelerometer observations(non-sensitive axis:10^(-9) m·s^(-2);sensitive axis:10^(-10) m·s^(-2)).(2)From the perspective of amplitude spectral density,the transplanted ACT1A and ACT1B products of GRACE-D satellite in this paper exhibit comparable accuracy to those released by JPL.(3)From the perspective of geoid degree errors,the gravity field model calculated using the transplanted accelerometer in this paper exhibits a high level of consistency with that of JPL product,with a difference standard deviation for gravity anomaly and equivalent water height better than 5.78×10^(-4)mGal and 1.5 cm respectively.The above results show that the accuracy of GRACE-D accelerometer transplanted data in this paper is comparable to that of JPL products.The algorithms and results presented in this study can provide valuable insights for developing an accelerometer transplant plan when China′s gravity satellites enter the aging period in the future.
作者
杨涛
陈秋杰
沈云中
YANG Tao;CHEN QiuJie;SHEN YunZhong(College of Surveying and Geo-informatics,Tongji University,Shanghai 200092,China)
出处
《地球物理学报》
北大核心
2025年第9期3303-3313,共11页
Chinese Journal of Geophysics
基金
国家自然科学基金(42192532,42174099)
国家重点研发计划(2021YFB3900101)
中央高校基本科研业务费专项资金资助.
