On the satellite clock datum stability of RT-PPP product and its application in one-way timing and time synchronization

Zuo, Hongming; Mao, Feiyu; Chen, Jiaqi; Gong, Xiaopeng; Gu, Shengfeng; Liu, Jingnan

doi:10.1007/s00190-022-01638-5

Cited by 13 publications

(4 citation statements)

References 24 publications

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“…However, in many studies on time transfer based on IGS real-time products, most scholars only focus on evaluating the accuracy and frequency stability of RTPPP method for time transfer, but lack specific analysis of factors affecting its time transfer accuracy and stability. Some scholars have noticed the influence of the reference stability of real-time satellite clock error products on the stability of time transfer [16]. It is found that the accuracy of RTPPP time transfer is related to the baseline length of time links, from about 0.1 ns for a 500 km baseline, it grows up to about 0.3 ns for the inter-continental baselines [13].…”

Section: Introductionmentioning

confidence: 99%

Impacts of satellite clock errors on GPS/BDS/Galileo real-time PPP time transfer

Zheng,

Wang,

Zhang

et al. 2024

Meas. Sci. Technol.

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By utilizing the real-time precise orbit and clock products provided by International GNSS Service (IGS), it is feasible to calculate real-time PPP (RTPPP) time and frequency transfer. The quality of these real-time precise products has a significant effect on the performance of clock comparisons and time transfer. This paper focuses on real-time clock comparisons with IGS real-time multi-GNSS precise products, which tries to explore the potential of GNSS RTPPP time transfer in time and frequency community. By using real-time precise satellite orbit and clock products from two IGS analysis centers, i.e., CNES and WHU, the clock comparisons and time transfer performance of four time links are comprehensively investigated. It is shown that the statistical uncertainty of real-time clock comparison based on Multi-GNSS is within 0.15 ns, and GPS RTPPP provides time transfer results with better performance than BDS-3 and Galileo. In addition, the deviations occur in remote time links results of BDS-3 and Galileo-only between using CNES and WHU, the maximum difference can reach up to 1.10 ns. It is shown that real-time BDS-3 and Galileo satellite products of CNES and WHU are inconsistent, and will affect the time transfer performance. The paper also investigates the receiver clock offset solutions determined by using different available satellites. The results show that there are significant satellite-related biases between different satellites, especially for BDS-3 and Galileo. Thus, the reference time scales determined by using different satellites are inconsistent, and further, the time transfer for long baseline time links will be affected as there are few common view satellites for remote stations.

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Section: Introductionmentioning

confidence: 99%

Impacts of satellite clock errors on GPS/BDS/Galileo real-time PPP time transfer

Zheng,

Wang,

Zhang

et al. 2024

Meas. Sci. Technol.

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“…The precise point positioning (PPP) technology is very useful in object positioning [1], and timing field [2,3]. By applying the PPP method, millimeter or centimeter-level positioning and sub-nanosecond level timing or time transfer are usually achieved with GNSS carrier phase, pseudo-range, and highprecise orbit/clock products.…”

Section: Introductionmentioning

confidence: 99%

“…Overall, the datum of real-time satellite clocks is an important parameter for the one-way timing system. Hence, the stability of the GPS clock datum was analyzed by Guo et al [2] and applied for GPS time transfer and one-way timing. The solutions demonstrated that GPS PPP one-way timing stability of all real-time products is about 9 × 10 −15 /day level.…”

Section: Introductionmentioning

confidence: 99%

Modeling and assessment of Galileo PPP one-way timing with RT-product

Wang,

Xu,

Jiang

et al. 2024

Meas. Sci. Technol.

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Precise point positioning (PPP) technology is widely used in Positioning, Navigation, and Timing. In order to meet the needs of users for real-time high-precision time information, a real-time Galileo PPP one-way timing model based on existing real-time (RT) products (CAS, CNES, GMV, and WHU) was established and applied for the timing field. Experiments were designed with 8 GNSS stations with an external H-MASER clock to research Galileo PPP timing with 25-day observation. For the modified Allan deviation (MDEV) of Galileo PPP timing solutions, similar to the timing solutions of GPS, the MDEV of Galileo PPP with CAS and CNES shows worse short-term frequency stability, with 1 to 2E-13 at 960 s stability, and indicates similar long-term frequency stability, with about 5 to 6 E-15 at 61440 s stability. For Galileo PPP time transfer, the standard deviation (STD) values are about 0.01 to 0.49 ns for all time-links with different products. For the stability of Galileo time transfer, the similar characteristic of Galileo time transfer is comparable to that of GPS. For short-term stability, the MDEV of all time-links from Gali-leo PPP ranges from 2E14 to 3E-14 at 960 s. For long-term stability, 1 to 2E-15 levels can be reached at 61440 s for all time-links, except for that of CNES.

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“…(Gong et al 2018;Lou et al 2022), satellite clock and bias estimation(Guo et al 2022;Lou et al 2017;Shi et al 2016Shi et al , 2019Zhang et al 2020), atmosphere modeling(Zheng et al 2017;Luo et al 2020;Luo et al 2021), and multi-sensor navigation…”

mentioning

confidence: 99%

Quasi-4-dimension ionospheric modeling and its application in PPP

Gan

et al. 2022

Satell Navig

Self Cite

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Ionospheric delay modeling is not only important for Global Navigation Satellite System (GNSS) based space weather study and monitoring, but also an efficient tool to speed up the convergence time of Precise Point Positioning (PPP). In this study, a novel model, denoted as Quasi-4-Dimension Ionospheric Modeling (Q4DIM) is proposed for wide-area high precision ionospheric delay correction. In Q4DIM, the Line Of Sight (LOS) ionospheric delays from a GNSS station network are divided into different clusters according to not only the location of latitude and longitude, but also satellite elevation and azimuth. Both Global Ionosphere Map (GIM) and Slant Ionospheric Delay (SID) models that are traditionally used for wide-area and regional ionospheric delay modeling, respectively, can be regarded as the special cases of Q4DIM by defining proper grids in latitude, longitude, elevation, and azimuth. Thus, Q4DIM presents a resilient model that is capable for both wide-area coverage and high precision. Four different sets of clusters are defined to illustrate the properties of Q4DIM based on 200 EUREF Permanent Network (EPN) stations. The results indicate that Q4DIM is compatible with the GIM products. Moreover, it is proved that by inducting the elevation and azimuth angle dependent residuals, the precision of the 2-dimensional GIM-like model, i.e., Q4DIM 2-Dimensional (Q4DIM-2D), is improved from around 1.5 Total Electron Content Units (TECU) to better than 0.5 TECU. In addition, treating Q4DIM as a 4-dimensional matrix in latitude, longitude, elevation, and azimuth, whose sparsity is less than 5%, can result in its feasibility in a bandwidth-sensitive applications, e.g., satellite-based Precising Point Positioning Real-Time Kinematic (PPP-RTK) service. Finally, the advantages of Q4DIM in PPP over the 2-dimensional models are demonstrated with the one month's data from 30 EPN stations in both high solar activity year 2014 and low solar activity year 2020.

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On the satellite clock datum stability of RT-PPP product and its application in one-way timing and time synchronization

Cited by 13 publications

References 24 publications

Impacts of satellite clock errors on GPS/BDS/Galileo real-time PPP time transfer

Impacts of satellite clock errors on GPS/BDS/Galileo real-time PPP time transfer

Modeling and assessment of Galileo PPP one-way timing with RT-product

Quasi-4-dimension ionospheric modeling and its application in PPP

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