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- W4322006947 abstract "The Combination Service for Time-variable Gravity fields (COST-G) provides models of the time-variable Earth gravity field that may be used for precise orbit determination (POD). While the monthly snapshot solutions based on GRACE or GRACE-FO GPS and microwave ranging interferometer data are the best available information on the time-variable gravity field, their latency of about 2-3 months prevents their use in operational POD. COST-G also provides a signal model fitted to the monthly GRACE-FO gravity fields that is updated quarterly and allows for the prediction of time-variable gravity, e.g. for use in applications that rely on short latency like operational POD.We present POD results for LEO and MEO satellites based on the COST-G fitted signal model (FSM), where we put special attention on the impact of the C20 gravity field coefficient, which is poorly defined from the GRACE/GRACE-FO observations, but may be replaced by SLR-only or SLR+GRACE/GRACE-FO combined solutions. We moreover present an extension of the COST-G FSM, also covering the GRACE-period and therefore suited for reprocessing campaigns that rely on a consistent model of time-variable gravity." @default.
- W4322006947 created "2023-02-26" @default.
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- W4322006947 date "2023-05-15" @default.
- W4322006947 modified "2023-09-29" @default.
- W4322006947 title "COST-G models of time-variable gravity for precise orbit determination" @default.
- W4322006947 doi "https://doi.org/10.5194/egusphere-egu23-6553" @default.
- W4322006947 hasPublicationYear "2023" @default.
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