A new approach to real-time precise point-positioning timing with International GNSS Service real-time service products

Ge, Yulong; Qin, Weijin; Su, Ke; Ouyang, Mingjun; Zhou, Feng; Zhao, Xin

doi:10.1088/1361-6501/ab2fa5

Cited by 11 publications

(11 citation statements)

References 34 publications

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“…Global navigation satellite systems (GNSSs) are an important tool for providing positioning, navigation and timing (PNT) services [1,2]. For high-accuracy timing or time transfer, several classical GNSS technologies, including the common-view (CV) [3], the two-way satellite time and frequency transfer (TWSTFT) [4], the all-in-view (AV) [5,6] and the precise point positioning (PPP) [7][8][9][10], are commonly employed. The PPP method has three obvious advantages.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, unlike IGS final products, the reference time of real-time precise products is not aligned to a unified time scale. Therefore, it just can be utilized for time transfer, not for timing, which has been proved by Ge et al [9]. Time transfer needs to exchange data and be one-to-one.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, time transfer is different for precise timing. Ge et al [9] proposed a precise satellite timing approach using IGS real-time service (RTS) products. The reference time of the RTS products is aligned to UTC(k) by a multi-GNSS PPP approach.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modeling and assessment of real-time precise point positioning timing with multi-GNSS observations

Ge¹,

Ding²,

Dai³

et al. 2020

Meas. Sci. Technol.

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Real-time precise point positioning (PPP) method is of great interest for global navigation satellite systems (GNSS) time application with multi-GNSS observations. In this study, a multi-GNSS precise timing approach using Centre National d'Etudes Spatiales (CNES) real-time products was presented to improve the reliable of precise timing. Users can obtain the difference between the local time (time of rover receiver) and UTC(k) directly using a GNSS receiver, once the CNES products are aligned to UTC(k) by a multi-GNSS PPP approach. In other words, the reference times of the realigned products for GPS, GLONASS, BDS-2 and Galileo are UTC (k). Then, users can obtain the difference between the local time and UTC(k) directly using any single-system or multi-GNSS combination. Note that the receiver hardware delay needs to be calibrated before timing application. Numerical analyses clarify how the multi-GNSS precise timing approach performs. First, the standard deviation (STD) of the difference between the multi-GNSS timing results and the clock difference from the IGS final products is shown to be less than 0.5 ns. The multi-GNSS solutions outperform that of a single system. Furthermore, GPS-only PPP timing solutions perform better than that of GLONASS and Galileo-only. In addition, the maximum reductions of STD values are up to 33.6%, 11.6%, 14.6%, 25.6% for GPS-only, GLONASS-only, Galileo-only and multi-GNSS timing, respectively, using a receiver clock model. Second, the frequency stability of the multi-GNSS scheme is slightly better than GPS-only. For single-system PPP timing, GLONASS-only performs worst, while GPS-only performs best. The maximum improvements of frequency stability are up to 61.9%, 67.1%, 90.6%, 65.8% for GPS-only, GLONASS-only, Galileo-only and multi-GNSS timing, respectively, with a receiver clock model using the realigned products. More interestingly, we found that the performance Galileo-only was improved with the observations on 2019 as compared to Galileo with the observations on 2018.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modeling and assessment of real-time precise point positioning timing with multi-GNSS observations

Ge¹,

Ding²,

Dai³

et al. 2020

Meas. Sci. Technol.

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“…Compared to real-time kinematic positioning [1,2], satellite ultra-rapid orbit products are some of the most important products for positioning, navigation, and timing users to obtain real-time and near real-time precise services in a single point mode [3,4]. Several research projects have been focused on improving the accuracy of satellite ultra-rapid orbit products as this has always been a difficulty in the field of global navigation satellite systems (GNSSs) [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Impact analysis of arc length in multi-GNSS ultra-rapid orbit determination based on the one-step method

Ye¹,

Yuan²,

Bao-Cheng³

2020

Meas. Sci. Technol.

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With the development of near real-time and real-time high-precision global navigation satellite system (GNSS) applications, users’ requirements for the accuracy and stability of ultra-rapid orbits have increased, especially for multi-constellation orbits. Generally, several factors affect the accuracy and stability of multi-GNSS ultra-rapid orbit determination; however, this study is focused only on analyzing the orbit arc length of ultra-rapid orbits of the GPS, GLONASS, BeiDou-2, and Galileo satellites based on the one-step method. To realize nearly ideal conditions in the process of analysis, one full year’s rapid orbit products during 2018 provided by the GeoForschungsZentrum multi-GNSS experiment analysis center were used as fitted observed orbits and also as a reference orbit for comparison to the predicted orbit. In terms of residual analysis of orbit difference and stability analysis of Helmert transformation parameters, the numerical results showed that the optimal orbit arc lengths of quad-constellation medium earth orbit (MEO) satellites for 6 h and 3 h predicted ultra-rapid orbits based on the one-step method were in the range of 44–45 h and 41–44 h, respectively. Overall, for both 6 h and 3 h predictions, when only considering the impact of the orbit arc length on the accuracy and stability of the orbit itself, 44 h can be considered as the overlapping optimal orbit arc length of quad-constellation MEO satellitesʼ ultra-rapid orbits generated by the one-step method. In addition, these ranges of orbit arc length can contribute to the multi-GNSS ultra-rapid orbit determination.

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“…The time transfer accuracy of this method can be achieved a few nanoseconds. The other ultra-precision time transfer techniques include GPS PPP (Precise Point Positioning time transfer), GPS CP (carrier phase) time transfer, and GPS AV (ALL in View) [4][5][6][7]. A study based on the GEO satellite will promote the application study on BeiDou [8].…”

Section: Introductionmentioning

confidence: 99%

Precise time and frequency transfer combined BeiDou’s RDSS and RNSS signals

Liu

Yuan

et al. 2019

J Wireless Com Network

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Unlike other satellite navigation systems such as GPS (Global Positioning System), the BeiDou satellite navigation system broadcasts RDSS (Radio Determination Satellite Service) and RNSS (Radio Navigation Satellite Service) signals simultaneously on its GEO (geostationary earth orbit) satellites and provides related navigation services. This paper studies the method of using the RDSS and RNSS signals of BeiDou to achieve accurate frequency and time transmission. We analyze the generation mechanism of RDSS signal and RNSS signal of BeiDou GEO satellite, establish a mathematical model of RDSS and RNSS signal frequency transfer, and derive an equation based on BeiDou's RDSS and RNSS signals for accurate frequency and time transmission. We also verified the relevant performance of the method through computer simulation. The results show that the combination of RDSS and RNSS signals from the BeiDou satellite system provides a new solution for its application in precise time and frequency transmission. This method is different from other satellite navigation systems such as GPS and is unique to the BeiDou system, with high accuracy and low dependence on satellite orbit accuracy.

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A new approach to real-time precise point-positioning timing with International GNSS Service real-time service products

Cited by 11 publications

References 34 publications

Modeling and assessment of real-time precise point positioning timing with multi-GNSS observations

Modeling and assessment of real-time precise point positioning timing with multi-GNSS observations

Impact analysis of arc length in multi-GNSS ultra-rapid orbit determination based on the one-step method

Precise time and frequency transfer combined BeiDou’s RDSS and RNSS signals

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