An investigation of PPP time transfer via BDS-3 PPP-B2b service

Ge, Yulong; Cao, Xinyun; Lyu, Daqian; Zhu, He; Ye, Fei; Xiao, Gongwei; Shen, Fei

doi:10.1007/s10291-023-01402-y

Cited by 27 publications

(11 citation statements)

References 35 publications

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“…The observation weights of the stochastic model can be set using Equation (3), where p is the observation weight and θ is the mean satellite elevation angle of two adjacent epochs [21,22]. The least-squares method can be used to solve the three-dimensional velocity and clock offsets of the receiver when there are at least four observation satellites.…”

Section: Algorithmsmentioning

confidence: 99%

“…Since the establishment of the Beidou-3 global navigation satellite system (BDS-3) on July 31, 2020, positioning, navigation, and timing (PNT) services have been provided in many fields worldwide [1]. BDS-3 uses a hybrid constellation comprising 24 medium earth orbit (MEO) satellites, three geostationary orbit (GEO) satellites, and three inclined geosynchronous orbit (IGSO) satellites [2,3]. To maintain geosynchronous characteristics, GEO satellites perform orbital maneuvers approximately once a month, and IGSO satellites perform orbital maneuvers approximately once every 6 months [4].…”

Section: Introductionmentioning

confidence: 99%

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Sensitivity and Consistency Analysis of BDS-3 GEO Satellite Orbit Maneuver Detection

Miao

Hong

et al. 2023

International Journal of Aerospace Engineering

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In this study, 22 maneuvering events of C59 and C60 geostationary equatorial orbit (GEO) satellites of the BeiDou global navigation satellite system (BDS-3) in 2021 were detected and analyzed based on a time-differenced carrier phase velocity measurement algorithm combined with a broadcast ephemeris and station data. We set different empirical thresholds to analyze the effect of threshold selection on the maneuvering detection sensitivity. The sensitivity and consistency of this algorithm for GEO satellite maneuvering detection were analyzed by combining BDS-3 with other Global navigation satellite systems (GNSS) and selecting different geographic stations. The results demonstrate that changing the threshold significantly affects the maneuvering detection of C60, with the optimal maneuvering thresholds of C59 and C60 being 0.045 and 0.02, respectively. A combination of BDS-3 and GPS with equal weights was identified to be most suitable for maneuvering detection of GEO satellites. For any specific maneuver, the difference between the maneuvering time detection of C59 by stations at different geographical locations was no more than 1 min. During the maneuvering detection of C60, the start time of maneuvering detected by African stations was 4.26–8.61 min earlier than that detected by the Chinese and Australian stations, and the end time of maneuvering detected by the African stations was consistent with that detected by the Chinese and Australian stations.

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Section: Algorithmsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sensitivity and Consistency Analysis of BDS-3 GEO Satellite Orbit Maneuver Detection

Miao

Hong

et al. 2023

International Journal of Aerospace Engineering

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“…Numerous studies have also explored PPP high-precision time transfer based on the carrier phase. Using BDS-2 and BDS-3, Zhang et al [20,21] quantitatively analyzed the noise level and frequency stability of long and short baseline time transfer links using the CV and carrier phase time transfer methods, showing that the BDS-3 time transfer performance was superior and can achieve sub-nanosecond accuracy for both long and short baseline time transfers. Using a PPP real-time time transfer method, Jie et al [22] showed that in zero and long baseline cases of a common hydrogen clock, the frequency stability of time transfer reached magnitudes of 10-16.…”

Section: Introductionmentioning

confidence: 99%

GPS + 5G fusion for high-precision time transfer

Liu,

Tu,

et al. 2024

Meas. Sci. Technol.

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With the continuous development and increasing popularity of the fifth generation (5G) of mobile communications technology, its fusion with the Global Navigation Satellite System (GNSS) data can effectively improve problems with service interruptions or poor satellite signal reception. In this study, GPS and 5G data were fused, and the resulting experimental algorithm showed that it effective improves time transfer’s frequency stability and reliability. Moreover, this technique reduced the noise level of time-transmitted clock offset sequences, while suppressing short-term mutations. By simulating different degrees of satellite signal occlusion, it was further verified that the GPS+5G fusion method can provide stable, high-precision, and real-time delivery services under insufficient satellite signal reception. This provides a reference for high-precision time transfer technology in complex environments and further improves the reliability of GNSS high-precision time transfer.

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“…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. Currently, post-processing PPP applications, such as positioning [4], timing [5][6][7][8], ionosphere 7 Guofang Wang and Lei Xu are the first authors. * Authors to whom any correspondence should be addressed.…”

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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An investigation of PPP time transfer via BDS-3 PPP-B2b service

Cited by 27 publications

References 35 publications

Sensitivity and Consistency Analysis of BDS-3 GEO Satellite Orbit Maneuver Detection

Sensitivity and Consistency Analysis of BDS-3 GEO Satellite Orbit Maneuver Detection

GPS + 5G fusion for high-precision time transfer

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

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