BDS-3/Galileo Time and Frequency Transfer with Quad-Frequency Precise Point Positioning

Ge, Yulong; Cao, Xinyun; Shen, Fei; Wang, Shengli

doi:10.3390/rs13142704

Cited by 13 publications

(4 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After its service, precise orbit determination [14][15][16], satellite clock offset estimation [17][18][19], tropospheric delay estimation [20], precise positioning [21][22][23][24] and time transfer [25][26][27][28], are studied. For precise applications, two representative technologies are Real-time Kinematic (RTK) and PPP [29].…”

Section: Introductionmentioning

confidence: 99%

Ground-Based GNSS Precipitable Water Vapor Retrieval With the BeiDou B2B Service

Cao,

Cheng,

Liang

et al. 2024

Preprint

View full text Add to dashboard Cite

Accurate measurement of water vapor is essential for researches and applications of meteorology, climatology and hydrology. Based on the BeiDou PPP-B2b service, real-time precipitable water vapor (PWV) is retrieved with the precise point positioning (PPP) software. The experiment was conducted in Beijing in January, 2023. Three solutions are designed with PPP using the BeiDou system only, the GPS system only and the BeiDou-GPS combined solution. Real-time PWVs for the 3 solutions are validated with the ERA5 reanalysis data. Between PWVs from single BeiDou and ERA, there are a bias of 0.7 mm and a RMSE of 1.8 mm. While for the GPS case, the bias is 0.73 mm and RMSE is 1.97 mm. The biases are less than 1 mm and RMSEs are less than 2mm. Both the BeiDou and the GPS processing performs very well. But little improvement is found for the BeiDou-GPS combined solution, comparing with the BeiDou system only and the GPS system only solution. This may be due to the poor handling of two different kinds of errors for the GPS and the BeiDou systems in our PPP software. A better PWV estimation with the two systems is to estimate PWV with single system at first step, and then to obtain the optimization by Bayesian model averaging.

show abstract

Section: Introductionmentioning

confidence: 99%

Ground-Based GNSS Precipitable Water Vapor Retrieval With the BeiDou B2B Service

Cao,

Cheng,

Liang

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…The nominal BDS-3 constellation includes 3 geostationary orbit (GEO) satellites, 3 inclined geosynchronous orbit (IGSO) satellites, and 24 medium earth orbit (MEO) satellites [16]. Some researchers evaluated the PPP time transfer performance of BDS-3 [17,18]. It is worth noting that most of the atomic clocks carried by the BDS-3 satellites are hydrogen masers.…”

Section: Introductionmentioning

confidence: 99%

GNSS/RNSS Integrated PPP Time Transfer: Performance with Almost Fully Deployed Multiple Constellations and a Priori ISB Constraints Considering Satellite Clock Datums

et al. 2023

View full text Add to dashboard Cite

Currently, the space segment of all the five satellite systems capable of providing precise time transfer services, namely BDS (including BDS-3 and BDS-2), GPS, GLONASS, Galileo, and Quasi-Zenith Satellite System (QZSS), has almost been fully deployed, which will definitely benefit the precise time transfer with satellite-based precise point positioning (PPP) technology. This study focuses on the latest performance of the BDS/GPS/GLONASS/Galileo/QZSS five-system combined PPP time transfer. The time transfer accuracy of the five-system integrated PPP was 0.061 ns, and the frequency stability was 1.24 × 10−13, 2.28 × 10−14, and 8.74 × 10−15 at an average time of 102, 103, and 104 s, respectively, which significantly outperforms the single-system cases. We also verified the outstanding time transfer performance of the five-system integrated PPP at locations with limited sky view. In addition, a method is proposed to mitigate the day-boundary jumps of inter-system bias (ISB) estimates by considering the difference in the satellite clock datums between two adjacent days. After applying a priori ISB constraints, the time transfer accuracy of the five-system integrated PPP can be improved by 37.9–51.6%, and the frequency stability can be improved by 14.8–21.6%, 5.3–7.6% and 20.0–29.6% at the three average times, respectively.

show abstract

“…The advantages of multi-frequency PPP time transfer are higher redundancy and reliability with respect to traditional DF PPP. In addition, the BDS-3 QF PPP models were investigated and studied for time transfer [26][27][28]. With the completion of BDS-3 global networking, it brings a great opportunity for time transfer [29].…”

Section: Introductionmentioning

confidence: 99%

An improved method for real-time PPP timing and time transfer with broadcast ephemerides

Ge¹,

Cao²,

Zhou³

et al. 2022

Meas. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

Due to the problem of network communication, it is difficult to ensure the reliability of real-time precise point positioning (PPP) timing/time transfer with real-time precise products. With the continued reduction in the signal-in-space range error (SISRE), the performance and feasibility of GPS or Galileo PPP timing/time transfer with broadcast ephemeris were analyzed firstly in real-time. Then, we present a smoothing method and time series decomposition method to reduce the noise and the interpolation error for GPS or Galileo PPP timing\time transfer with broadcast ephemeris in real-time. The results showed that GPS or Galileo PPP timing with broadcast ephemeris can achieve 4×1E-14 level at 15360 s at the current state. The accuracy is about (0.46~0.81) ns and (0.44~0.61) ns for GPS or Galileo PPP time transfer. The frequency stability is about 7.0×1E-14 and 5.0×1E-14 levels at 15360 s for GPS and Galileo PPP. Importantly, by applying our approach, the maximum improvement in frequency stability for GPS or Galileo PPP timing/time transfer is up to 99 %. Furthermore, the average accuracy of GPS or Galileo PPP time transfer can achieve approximately 0.3 ns, which is improved by up to 67.3 % as compared to the traditional method.

show abstract

BDS-3/Galileo Time and Frequency Transfer with Quad-Frequency Precise Point Positioning

Cited by 13 publications

References 35 publications

Ground-Based GNSS Precipitable Water Vapor Retrieval With the BeiDou B2B Service

Ground-Based GNSS Precipitable Water Vapor Retrieval With the BeiDou B2B Service

GNSS/RNSS Integrated PPP Time Transfer: Performance with Almost Fully Deployed Multiple Constellations and a Priori ISB Constraints Considering Satellite Clock Datums

An improved method for real-time PPP timing and time transfer with broadcast ephemerides

Contact Info

Product

Resources

About