The Application of Smoothed Code in BeiDou Common View

Guang, Wang; Yuan, Haibo

doi:10.1007/978-3-642-37398-5_26

Cited by 7 publications

(2 citation statements)

References 4 publications

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“…The array covers the entire Asia-Pacific region and includes five geostationary earth orbit (GEO) satellites, five inclined geostationary earth orbit satellites (IGSO), and four medium earth orbit (MEO) satellites [9][10][11]. Hence, the topic of time and frequency transfer based on BDS has been the subject of considerable interest for those invested in meeting the BDS PNT requirement [12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Impact of BeiDou satellite-induced code bias variations on precise time and frequency transfer

Zhang

Gao

et al. 2019

Meas. Sci. Technol.

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The Chinese BeiDou navigation satellite system (BDS) is an emerging global navigation satellite system similar to the global positioning system (GPS), which provides positioning, navigation and timing services. The typical character of BDS code bias variation has received greater attention in relation to positioning and navigation in comparison with its underlying mechanism and effects on BDS carrier-phase time and frequency transfer. This study developed a code bias variation correction model. The improvements in the model correction results from nine time transfer stations were observed at two satellite frequencies (i.e. B1 and B2) and for both inclined geostationary orbit (IGSO) and medium earth orbit (MEO) satellite constellations. At frequency B1, the IGSO and the MEO variation improved by 43.64% and 46.39%, respectively. At frequency B2, the IGSO and the MEO variation improved by 52.14% and 51.08%, respectively. Raw and corrected scenarios were compared in an experiment investigating time and frequency transfer. Consequently, the impact of BDS code bias variation on time and frequency transfer was mainly concentrated on the value of the time and frequency transfer. It was not a constant value (mean time transfer value of −0.41 ns), and the corresponding amplitude is closely related to the geodetic distance of the time links. Moreover, the BDS code bias variation showed no obvious effect on the frequency stability of the time links. Therefore, the satellite-induced code bias variation is a crucial error term in practical time transfer work, which needs to be corrected to improve the accuracy of the time transfer value, particularly for a long geodetic distance time link.

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Section: Introductionmentioning

confidence: 99%

Impact of BeiDou satellite-induced code bias variations on precise time and frequency transfer

Zhang

Gao

et al. 2019

Meas. Sci. Technol.

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“…Meanwhile, we have been carrying out the BeiDou time comparisons, including Europe-Asia long baseline. In fact, the BeiDou CV and PPP were already implemented in many short-baseline experiments and it showed the good performance [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Progress of BeiDou time transfer at NTSC

Guang

Dong

et al. 2018

Metrologia

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Time transfer using global navigation satellite system (GNSS) is a primary method of remote atomic clock comparisons. As of today, there are four operational GNSS systems, namely GPS, GLONASS, Galileo and BeiDou Navigation Satellite System (BDS or BeiDou). All of them can continuously provide position, navigation and time services. This paper mainly focuses on the progress of BeiDou time transfer at the National Time Service Center, Chinese Academy of Sciences (NTSC). In order to realize the BeiDou common view (CV) time comparison, we developed the Rinex2CGGTTS software according to the guidelines of the Common GNSS Generic Time Transfer Standard, Version 2E (CGGTTS V2E). By comparing the solutions of the Rinex2CGGTTS software to the solutions of the sbf2cggtts software provided by the manufacturer of our multi-GNSS receiver, we found the sbf2cggtts (version 1.0.5) solutions contained biases in measurements to different BeiDou satellites. The biases are most likely caused by sbf2cggtts’ timing group delay corrections in data processing. The noise of the observation data is analyzed by code multipath and common clock difference. Finally, the BeiDou CV results are compared to the GPS/GLONASS/Galileo CV results between NTSC and three European UTC(k) laboratories, including Royal Observatory of Belgium (ORB), Real Institute y Observatory de la Armada (ROA), Research Institutes of Sweden (RISE or SP). For the comparisons of each baseline, we aligned the BeiDou/Galileo/GLONASS links to the calibrated GPS link with the double-difference method. The results show that the performance of BeiDou CV is correlated to the number of BeiDou satellites available in common view. With the current BeiDou constellation, the standard deviation of the differences between all BeiDou CV satellites averaging result and the GPS PPP result is 2.03 ns, 2.90 ns and 4.06 ns for ORB-NTSC, SP-NTSC and ROA-NTSC links respectively.

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The Method of BDS PPP Time Transfer Considering Clock Modeling

Ding

Dai

et al. 2020

Lecture Notes in Electrical Engineering

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The Application of Smoothed Code in BeiDou Common View

Cited by 7 publications

References 4 publications

Impact of BeiDou satellite-induced code bias variations on precise time and frequency transfer

Impact of BeiDou satellite-induced code bias variations on precise time and frequency transfer

Progress of BeiDou time transfer at NTSC

The Method of BDS PPP Time Transfer Considering Clock Modeling

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