Improved design of control segment in BDS‐3

Liu, Li; Zhang, Tianqiao; Zhou, Shanshi; Hu, Xiaogong; Liu, Xiaoping

doi:10.1002/navi.297

Cited by 26 publications

(10 citation statements)

References 14 publications

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“…Distinct from other GNSS (Global Navigation Satellite System), BDS has both RNSS and RDSS signals on the GEO satellite [9,10]. Figure 1 shows a schematic diagram of BeiDou's RDSS and RNSS on its GEO satellite.…”

Section: Rdss and Rnss Signal Propagation Modelmentioning

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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Section: Rdss and Rnss Signal Propagation Modelmentioning

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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“…The results of the long-term operation of BDS-2 show that the time synchronization is very successful with the uncertainty of satellite-to-ground time comparison better than 1 ns, which effectively improves the orbit and time synchronization accuracy of the satellites (Liu et al, 2009;Han et al, 2013;Guo et al, 2018). For this reason, the BDS-3 continues to use this time synchronization technique, and further adds inter-satellite time comparison links to directly measure the distances and relative clock offsets between the satellites (Liu et al, 2019;Chen et al 2016). The distinctive time synchronization technique is one of the important innovations of BeiDou Navigation Satellite System (BDS).…”

Section: Introductionmentioning

confidence: 99%

The space–time references of BeiDou Navigation Satellite System

et al. 2021

Self Cite

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The BeiDou Navigation Satellite System (BDS) is essentially a precise time measurement and time synchronization system for a large-scale space near the Earth. General relativity is the basic theoretical framework for the information processing in the master control station of BDS. Having introduced the basic conceptions of relativistic space–time reference systems, the space–time references of BDS are analyzed and the function and acquisition method of the Earth Orientation Parameters (EOP) are briefly discussed. The basic space reference of BDS is BeiDou Coordinate System (BDCS), and the time standard is the BDS Time (BDT). BDCS and BDT are the realizations of the Geocentric Terrestrial Reference System (GTRS) and the Terrestrial Time (TT) for BDS, respectively. The station coordinates in the BDCS are consistent with those in International Terrestrial Reference Frame (ITRF)2014 at the cm–level and the difference in scale is about $$1.1 \times 10^{ - 8}$$ 1.1 × 10 - 8 . The time deviation of BDT relative to International Atomic Time (TAI) is less than 50 ns and the frequency deviation is less than $$2 \times 10^{ - 14}$$ 2 × 10 - 14 . The Geocentric Celestial Reference System (GCRS) and the solar Barycentric Celestial Reference System (BCRS) are also involved in the operation of BDS. The observation models for time synchronization and precise orbit determination are established within the GCRS framework. The coordinate transformation between BDCS and GCRS is consistent with the International Earth Rotation and Reference Systems Service (IERS). In the autonomous operation mode without the support of the ground master control station, Earth Orientation Parameters (EOP) is obtained by means of long-term prediction and on-board observation. The observation models for the on-board astrometry should be established within the BCRS framework.

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“…Concurrently, for smooth transitioning with BDS-2, all types of BDS-3 satellites allow for compatible broadcasting of B1I (1561.098MHz) and B3I (1207.14MHz) [6] [7] , as mentioned in Table 2. A series of improvements have been inculcated in the ground segment of BDS-3 [8] , and the inter-satellite link is added at its space segment [9] .…”

Section: Introductionmentioning

confidence: 99%

Analysis on Signal-in-Space Range Error and Positioning Accuracy of BDS-3

Liu

Jiao

Jinming

et al. 2021

Preprint

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Being the first mixed-constellation global navigation system, the global BeiDou navigation system (BDS-3) designs new signals, the service performance of which has attracted extensive attention. In the present study, the Signal-in-space range error (SISRE) computation method for different types of navigation satellites was presented. And the differential code bias (DCB) correction method for BDS-3 new signals was deduced. Based on these, analysis and evaluation were done by adopting the actual measured data after the official launching of BDS-3. The results showed that BDS-3 performed better than the regional navigation satellite system (BDS-2) in terms of SISRE. Specifically, the SISRE of the BDS-3 medium earth orbit (MEO) satellites reached 0.52 m, slightly inferior compared to 0.4 m from Galileo, marginally better than 0.57 m from GPS, and significantly better than 2.33 m from GLONASS. And the BDS-3 inclined geostationary orbit (IGSO) satellites achieved the SISRE of 0.90 m, on par with that of the QZSS IGSO satellites. However, the average SISRE of BDS-3 geostationary earth orbit (GEO) satellites was 1.15 m, which was marginally inferior to that of the QZSS GEO satellite (0.91m). In terms of positioning accuracy, the overall three-dimensional single-frequency standard point positioning (SPP) accuracy of BDS-3 B1C, B2a, B1I, and B3I gained an accuracy level better than 5 m. Moreover, the B1I signal exhibited the best positioning accuracy in the Asian-Pacific region, while the B1C signal set forth the best positioning accuracy in the other regions. Owing to the advantage in signal frequency, the dual-frequency SPP accuracy of B1C+B2a surpassed that of the transitional signal of B1I+B3I. Since there are more visible satellites in Asia-Pacific, the positioning accuracy of BDS-3 was moderately superior to that of GPS. The precise point positioning (PPP) accuracy of BDS-3 B1C+B2a or B1I+B3I converged to the order of centimeters, marginally inferior to that of the GPS L1+L2. However, these three combinations had a similar convergence time of approximately 30 minutes.

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Improved design of control segment in BDS‐3

Cited by 26 publications

References 14 publications

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

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

The space–time references of BeiDou Navigation Satellite System

Analysis on Signal-in-Space Range Error and Positioning Accuracy of BDS-3

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