A new receiver clock model to enhance BDS-3 real-time PPP time transfer with the PPP-B2b service

Ge, Yulong; Wang, Qing; Wang, Yong; Lyu, Daqian; Cao, Xinyun; Shen, Fei; Meng, Xiaolin

doi:10.1186/s43020-023-00097-3

Cited by 10 publications

(4 citation statements)

References 33 publications

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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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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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“…Both the IGSO and MEO satellites of BDS-3 can transmit observations of five frequency signals [3,4]. Despite the increased complexity in process-ing the observations of multi-orbit and multi-frequency signals, this ability significantly improves the overall service performance and accuracy of the system [5,6].…”

Section: Introductionmentioning

confidence: 99%

The Extraction and Characterization of Pseudorange Multipath Based on BDS-3 Multi-Frequency Observations

Guo

et al. 2023

Sensors

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Global Navigation Satellite System (GNSS) observations are subject to various errors during their propagation process. A reasonable correction of these errors can improve the positioning, navigation, and timing (PNT) service capability. The impact of multipaths on pseudorange observations can reach a decimeters or even meters level. However, their mechanism is complex and there is currently no universally accepted high-precision correction model. The correlation between the pseudorange multipaths (MP) of BDS-2 satellites and satellite elevation has been confirmed, while there have been fewer analyses of the MP characteristics for different frequencies of BDS-3 satellites. The broadcasting of multi-frequency observations in BDS-3 should theoretically make the extracted MP more accurate compared to traditional methods. Based on this, in this contribution, a multi-frequency MP extraction algorithm based on the least squares principle is proposed, which can simultaneously eliminate the influence of higher-order ionospheric delay. The analytical expression for only eliminating first-order ionospheric delay is successfully derived. Subsequently, the characteristics of the MPs extracted from different frequency combinations and the impact of combination noise on the extraction accuracy are discussed. The influence of second-order ionospheric delay on the MPs for each frequency under different combination noises, as well as the periodic behavior exhibited in long-term observations of the BDS-3 medium earth orbit (MEO) and inclined geosynchronous orbit (IGSO) satellites, are also analyzed. Finally, the correlations between the MPs of each frequency of BDS satellite and elevation are quantitatively analyzed based on observations from 35 stations. Overall, this work has positive implications for the study of the MP characteristics of BDS-3 and subsequent modeling efforts.

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“…introduced the PPP‐B2b service introduced in the Beidou‐3 navigation satellite system, and used the new receiver clock model to improve the accuracy of PPP time transfer, especially the improvement effect on BDS‐3 and BDS‐3/GPS PPP. The results show that the new clock model significantly improves the accuracy of time transfer and short‐term frequency stability [12]. Since 2020, China's Beidou satellite system has provided real‐time precision point positioning services in the Asia–Pacific region, which can be used for centimetre‐level positioning and real‐time time transmission.…”

Section: Introductionmentioning

confidence: 99%

Undifferenced precise time transfer with information‐constraints

Liu,

Tu,

Chen

et al. 2023

IET Radar Sonar & Navi

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Satellite navigation systems enable long‐distance and high‐precision time transfers. The authors proposed an undifferenced precise time transfer method with information constraints in this study. A more accurate receiver clock offset can be obtained by constraining the station coordinate parameters and receiver clock offset parameters to achieve a precise time transfer. In this example, the research object is the time transfer link established by the Global Positioning System observation station using a caesium clock, rubidium clock, and hydrogen clock. The clock difference sequence of the time‐transfer link was calculated by combining the observation data and precise products. Following analysis of the examples, the following conclusions were reached. The undifferenced precise time transfer method based on information constraints can effectively be used to smooth the clock difference sequence of the receiver and the clock difference sequence of the time transfer link. To some extent, this method can also be used to reflect the performance of atomic clocks at Global Positioning System stations and is better suited for the precise time transfer of the equal‐clock long‐baseline time transfer link. Simultaneously, the frequency stability of this method is improved significantly in the short term compared to the traditional scheme without any constraints. The improvement of frequency stability is helpful to improve the accuracy of time transfer.

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A new receiver clock model to enhance BDS-3 real-time PPP time transfer with the PPP-B2b service

Cited by 10 publications

References 33 publications

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

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

The Extraction and Characterization of Pseudorange Multipath Based on BDS-3 Multi-Frequency Observations

Undifferenced precise time transfer with information‐constraints

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