Service and Evaluation of the GPS Triple-Frequency Satellite Clock Offset

Li, Haojun; Zhu, Weidong; Zhao, Rungen; Wang, Jiexian

doi:10.1017/s0373463318000218

Cited by 4 publications

(2 citation statements)

References 21 publications

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“…Consequently, the satellite clock error values derived from different observations may exhibit differences. The computation method of GPS satellite clock errors for different observations, which incorporates IGS products and observation biases, has been developed to address the needs of the single-, dual-and triple-frequency positioning user [15,16].…”

Section: Introductionmentioning

confidence: 99%

Reconstructed estimation method of the multi-frequency GNSS inter-frequency clock bias

Xiao,

Li,

Kang

et al. 2023

Meas. Sci. Technol.

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In consideration of contributions from both carrier phase and pseudorange observations during computation, this study introduces a reconstructed method for estimating the multi-frequency global navigation satellite system (GNSS) inter-frequency clock biases (IFCB). Diverging from conventional approaches that separately calculate the time-varying and constant parts of IFCBs using carrier phase and pseudorange observations, the reconstructed method directly utilizes their combination to estimate satellite IFCBs. To validate the efficacy of the presented approach, 7 d observations from 87 International GNSS Service (IGS) stations are analyzed, with a specific focus on triple-frequency GPS, multi-frequency BDS-3, and Galileo IFCBs, aiming to scrutinize their distinctive characteristics. Furthermore, the performances of satellite IFCB estimation are investigated in both precise point positioning (PPP) and single-point positioning (SPP) using 35 IGS stations over 3 d. The results demonstrate that IFCBs of GPS BLOCK IIIA satellites exhibit centimeter-level variations, distinguishing them from BLOCK IIF counterparts. The Galileo IFCBs vary from millimeter to centimeter level, while those of BDS-3 reach a centimeter level. These variations significantly impact GPS PPP convergence performances but have minimal effects on Galileo and BDS-3 PPP. SPP performances are slightly enhanced when the time-varying IFCB part are taken into account. Additionally, we note disparities in the constant parts of satellite IFCBs computed with differential code bias (DCB) products, reconstructed, and pseudorange observation-based methods, particularly for BDS-3 C2I/C6I-C1P/C5P and C2I/C6I-C1P/C6I combinations. The differences of IFCB estimated with different strategies, SPP and PPP performances show that the reconstructed method is better than others, and the IFCB accuracy decreases when computed with satellite DCB products.

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Section: Introductionmentioning

confidence: 99%

Reconstructed estimation method of the multi-frequency GNSS inter-frequency clock bias

Xiao,

Li,

Kang

et al. 2023

Meas. Sci. Technol.

Self Cite

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show abstract

“…Since then, in order that high-precision satellite clock and orbit products are provided for users, with the help of multiple agencies and centers, real-time service (RTS) of IGS is published as Ratio Technical Commission for Maritime Services (RTCM) and state-space representation (SSR) streams are broadcasted on the Internet [18]. Based on the analysis for triple-frequency observations, the GPS inter-frequency clock bias is noticed [9][10][11] and the estimation for the triple-frequency satellite clock is developed [12,13]. The satellite clock services for the single, dual and triple-frequency users are realized based on the IGS clock products, which is estimated with ionosphere-free phase and pseudorange combinations, and the biases between the different observations.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Estimation of GPS Satellite Clock Errors and Its Precise Point Positioning Performance

Zou

Wang

2022

Proceeding of 2021 International Conference on Wireless Communications, Networking and Applications

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The current stochastic model in GNSS processing is constructed based on the prior experience, for example the ratio of the weight of the pseudorange and phase observations is generally determined as 1:10000. These methods ignore the precision differences of the different GNSS receivers and observation space. In this paper, the standard deviation of differenced ionosphere-free pseudorange and phase observations is computed with dual-frequency observations and then the weight ratio of the pseudorange and phase observations is obtained using the computed standard deviation. This method is introduced in satellite clock estimating and the data is processed. The results show that the presented method is feasible, with which the accuracy of the estimated satellite clock results is improved. The estimated satellite clock results are further adopted in PPP and the positioning results of the 10 users validate that the estimated satellite clock, which uses the presented method, can accelerate the convergence of PPP compared with the traditional method.

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Estimating GPS inter-frequency clock bias to provide a parameterized product

Li,

Yang,

et al. 2024

GPS Solut

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Service and Evaluation of the GPS Triple-Frequency Satellite Clock Offset

Cited by 4 publications

References 21 publications

Reconstructed estimation method of the multi-frequency GNSS inter-frequency clock bias

Reconstructed estimation method of the multi-frequency GNSS inter-frequency clock bias

Real-Time Estimation of GPS Satellite Clock Errors and Its Precise Point Positioning Performance

Estimating GPS inter-frequency clock bias to provide a parameterized product

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