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- W3152173086 abstract "The inter-frequency bias of PRN25 was noticed by the scientific community and considered to be caused by thermal variations. The inter-frequency bias leads to an apparent inter-frequency clock bias (IFCB), which could be obtained using the difference of two ionosphere-free phase combinations (L1/L2 and L1/L5). We present an efficient approach derived from the epoch-differenced strategy for fast estimation of IFCBs for Block IIF satellites. For the analysis, data from 32 stations from the IGS network spanning 10 months (DOY 213, 2011-153, 2012) are processed. The processing times show that the epoch-dif- ferenced method is more efficient than the undifferenced one. In order to study the features of IFCB, a harmonic analysis is performed by using a FFT (fast Fourier trans- formation), and significant periodic variations with the periods of 12, 6 and 8 h are noticed. The fourth-order period is determined by comparing the performances of the model with different periods. After determination, a har- monics-based function of order 4 is used to model the IFCB, and the single-day amplitudes and phases are esti- mated for the 10 months from a least squares fit. Based on the estimated results, the characterization of IFCB is dis- cussed. The algorithm is incorporated into the MGPSS software developed at SHAO (Shanghai Astronomical Observatory, Chinese Academy of Sciences) and used to monitor the IFCB variations of GPS and COMPASS sys- tems in near real time." @default.
- W3152173086 created "2021-04-13" @default.
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- W3152173086 date "2013-01-01" @default.
- W3152173086 modified "2023-09-26" @default.
- W3152173086 title "Fast estimation and analysis of the inter-frequency clock bias for Block IIF satellites" @default.
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