GPS All in View time transfer for TAI computation

Petit, Gérard; Jiang, Z.

doi:10.1088/0026-1394/45/1/006

Cited by 117 publications

(66 citation statements)

References 14 publications

(15 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 3 shows these error factors. There are the satellite clock error, the satellite orbit error, the tropospheric delay, the ionospheric delay, the multipath, the receiver clock error, the cable delay, the hardware delay, and so on [7]. A time correction must be performed because the observation files from geodetic receivers providing both GPS and GLONASS are dated in GPS time, while the reference of the GLONASS broadcast navigation message is GLONASS time, which is aligned on …”

Section: Procedures Of Gnss Time Transfermentioning

confidence: 99%

“…Hence, it is possible to compute an AV solution combining the CGGTTS results for satellites from both constellations [7] ESOC has been provided a better stability to the biases on a daily basis from December 2012. In order to be consistent with the clock products used, which are computed on a daily and satellite basis, it was decided to compute the IFBs for each satellite and for each day separately from the CGGTTS results corrected with ESOC products [8].…”

Section: Considerations Of Glonass Observations To Combine Gps Observmentioning

confidence: 99%

See 1 more Smart Citation

Comparison of Clock Solution of GLONASS Time Transfer using ESOC Clock products

Yu¹

2017

IJCA

View full text Add to dashboard Cite

AV). With the completion of the GLONASS constellation, GLONASS measurements could have been used in the dual-frequency AV mode. R2CGGTTS software is commonly used in GNSS (Global Navigation Satellite System) Time Transfer to provide the standard time transfer format, CGGTTS (Common GPS GLONASS Time Transfer), using observation files and navigation files written in RINEX format. Hence, the combination of GPS and GLONASS provides a clock solution based on AV mode using one time transfer solution. To provide the clock solution combined GPS and GLONASS measurements, the ISB (Inter System Bias) should be removed. One IGS analysis center, ESOC, provides satellite clocks for GPS as well as GLONASS satellites with the same reference for both constellations. Thanks to the ESOC clock products, to compute an AV solution combining the CGGTTS for both constellations is now possible.In this paper, we present the results of the first step of the combination of GPS and GLONASS clock measurements, which is the clock correction of GLONASS code measurements using ESOC clock products.

show abstract

Section: Procedures Of Gnss Time Transfermentioning

confidence: 99%

Section: Considerations Of Glonass Observations To Combine Gps Observmentioning

confidence: 99%

Comparison of Clock Solution of GLONASS Time Transfer using ESOC Clock products

Yu¹

2017

IJCA

View full text Add to dashboard Cite

show abstract

“…Since the 1980s, the Global Positioning System (GPS) operated by the United States has been used for time and frequency transfer based on the common view (CV) approach, which provides impetus to the application in the field of time and frequency [1,2]. With development of the International GNSS Service (IGS) products, particularly for satellite orbit and clock products [3,4], all in view (AV) and carrier phase (CP) approaches have been proposed for time and frequency transfer using GPS code and carrier phase observations [5,6]. These approaches exhibit a better performance compared to the CV approach.…”

Section: Introductionmentioning

confidence: 99%

Combining GPS, BeiDou, and Galileo Satellite Systems for Time and Frequency Transfer Based on Carrier Phase Observations

Zhang

et al. 2018

Remote Sensing

View full text Add to dashboard Cite

Abstract:The carrier-phase (CP) technique based on the Global Navigation Satellite System (GNSS) has proved to be a useful spatial tool for remote and precise time transfer. In order to improve the robustness and stability of the time transfer solution for a time link, a new CP approach based on a combination of GPS, BeiDou (BDS), and Galileo satellite systems is proposed in this study. The mathematical model for the obtained unique time transfer solution is discussed. Three GNSS stations that can track GPS, BeiDou, and Galileo satellites were used, and two time links are established to assess the performance of the approach. Multi-GNSS time transfer outperforms single GNSS by increasing the number of available satellites and improving the time dilution of precision. For the long time link, with a geodetic distance of 7537.5 km, the RMS value of the combined multi-system solution improves by 18.8%, 59.4%, and 35.0% compared to GPS-only, BDS-only, and Galileo-only, respectively. The average frequency stability improves by 12.9%, 62.3%, and 36.0%, respectively. For the short time link, with a geodetic distance of 4.7 m, the improvement after combining the three GNSSs is 6.7% for GPS-only, 52.6% for BDS-only, and 38.2% for Galileo-only.

show abstract

“…PPP has been utilized to compute time links for TAI since September 2009 and is currently used by upon 50% of more than 70 laboratories in the word contributing to TAI and Universal Time Coordinated (UTC) computation [7,8]. Compared with GNSS code-only techniques, such as CV and All-in-View (AV) [9], better short-term stability in time transfer can be achieve with PPP. The present typical uncertainty of PPP-based frequency comparison is about 1 × 10 −15 at 1-day average and about 1 × 10 −16 at 30-day average, where corresponding to type A uncertainty of 0.3 ns for time-links in the Bureau International des Poids et Mesures (BIPM) Circular T. Moreover, the integer-PPP (IPPP) technique implemented by CNES (Centre National d'Etudes Spatiales) was first applied to perform frequency transfer [10].…”

Section: Introductionmentioning

confidence: 99%

Consideration of GLONASS Inter-Frequency Code Biases in Precise Point Positioning (PPP) International Time Transfer

Qin

Cao

et al. 2018

Applied Sciences

View full text Add to dashboard Cite

Abstract:International time transfer based on Global Navigation Satellite System (GLONASS) precise point positioning (PPP) is influenced by inter-frequency code biases (IFCBs) because of the application of frequency division multiple access technique. This work seeks to gain insight into the influence of GLONASS IFCBs on international time transfer based on GLONASS-only PPP. With a re-parameterization process, three IFCB handling schemes are proposed: neglecting IFCBs, estimating IFCB for each GLONASS frequency number, and estimating IFCB for each GLONASS satellite. Observation data collected from 39 globally distributed stations in a 71-day period (DOY 227-297, 2017) was exclusively processed. For the comparison reason, Global Positioning System (GPS)-only PPP solutions were regarded as reference values. The clock differences derived from GPS-and GLONASS-only PPP solutions were then analyzed. The experimental results demonstrated that considering GLONASS IFCBs could reduce standard deviation (STD) of the clock differences for both identical receiver types and mixed receiver types, of which reduction was from 3.3% to 62.6%. Furthermore, compared with neglecting IFCBs, STD of the clock differences with estimating IFCB for each GLONASS satellite in coordinate-fixed mode was reduced by more than 30% from 0.30 to 0.20 ns, and by 10% from 0.40 to 0.35 ns, for 1-day arc solutions and 10-day arc solutions, respectively. Moreover, different precise products from three International GNSS Service (IGS) analysis centers were also evaluated. Even though different IFCB handling schemes were adopted in GLONASS satellite clock estimation, our numerical results showed that international time transfer on the basis of estimating IFCB for each GLONASS satellite better than the other two processing schemes. To achieve high-precision GLONASS-only PPP-based international time transfer, it is highly recommended to estimate IFCB for each GLONASS satellite.

show abstract

GPS All in View time transfer for TAI computation

Cited by 117 publications

References 14 publications

Comparison of Clock Solution of GLONASS Time Transfer using ESOC Clock products

Comparison of Clock Solution of GLONASS Time Transfer using ESOC Clock products

Combining GPS, BeiDou, and Galileo Satellite Systems for Time and Frequency Transfer Based on Carrier Phase Observations

Consideration of GLONASS Inter-Frequency Code Biases in Precise Point Positioning (PPP) International Time Transfer

Contact Info

Product

Resources

About