Orbit determination and prediction for Beidou GEO satellites at the time of the spring/autumn equinox

Li, Xiaojie; Zhou, Ji; Hu, Xiaogong; Liu, Li; Guo, Rui; Zhou, Shanshi

doi:10.1007/s11433-015-5675-6

Cited by 13 publications

(7 citation statements)

References 6 publications

(6 reference statements)

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“…It can be seen that the PDOP increments were from 0.15 to 0.5 when only one satellite was unhealthy, and from 0.3 to 0.8 when two satellites were unhealthy. Since the average σUERE is about 1.5 meters for the BDS [21], the average decrease of positioning accuracy is about 0.2 to 0.75 meters for one unhealthy satellite and 0.45 to 1.2 meters for two unhealthy satellites.…”

Section: Impacts Of Unhealthy States On System Performancementioning

confidence: 99%

BeiDou Satellite Unhealthy States and the Impact on System Performance

Shi

Chen

et al. 2018

Sensors

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The BeiDou system satellites may be unhealthy due to many reasons, affecting system performance in different ways. Therefore, it is important to analyze the causes and characteristics of the satellites’ unhealthy states. In this study, these states are classified into five types based on the broadcast ephemeris. Three criteria are presented, based on which a general classification method is proposed. Data from July 2017 to June 2018 are analyzed to validate the method, from which we know that the average unhealthy duration due to satellite maneuvers is much longer than the duration of unhealthy states related to satellite orbit or clock anomalies, and the other unhealthy states may be caused by inbound or outbound satellites. Statistics show that most of the time, the number of unhealthy satellites is no more than two and the average positioning accuracy in the service area will decrease by no more than 0.75 and 1.2 meters when one or two BDS satellites are unhealthy, respectively.

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Section: Impacts Of Unhealthy States On System Performancementioning

confidence: 99%

BeiDou Satellite Unhealthy States and the Impact on System Performance

Shi

Chen

et al. 2018

Sensors

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“…Users can obtain PNT service by receiving any branch signal and navigation message, and the service mode of single, dual, or triple frequency can be chosen by users. Since BDS‐2 was officially put into full operation in 2012, its navigation signal measurement accuracy, satellite orbit and clock correction performance, positioning accuracy, and timing accuracy have been fully verified . Under normal circumstances, the radial accuracy of the broadcast ephemeris of BDS‐2 satellites is better than 0.5 m, the precision of the ephemeris of the IGSO and MEO satellites is better than 10 cm, and the precision of the ephemeris of the GEO satellites is better than 50 cm .…”

Section: Introductionmentioning

confidence: 99%

“…However, BDS‐2 also has some limitations: (1) During the period of satellite eclipse, especially during the yaw attitude change of IGSO and MEO satellites, the accuracy of satellite broadcast ephemeris and precision ephemeris will be reduced. The radial error of broadcast ephemeris may be as large as 1.5 to 2.0 m, and the precision ephemeris error will also exceed 10 cm . (2) Since the design of BDS‐2 is focused on providing services to users in China and surrounding areas, RDSS cannot provide location reporting and short‐message services for global users.…”

Section: Introductionmentioning

confidence: 99%

Improved design of control segment in BDS‐3

et al. 2019

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The Chinese BeiDou Navigation Satellite System (BDS) is accelerating its development and has been applied in various fields. Compared with other satellite navigation systems in the world, BDS has many unique features such as multiservices integrated with Radio Determination Satellite Service (RDSS), Radio Navigation Satellite Service (RNSS), and Satellite-Based Augmentation Service (SBAS), a mixed-orbit satellite constellation, and flexible navigation messages, etc. This paper presents the distinctive innovative designs as well as processing strategies in BDS. First, this paper introduces the characteristics of BeiDou navigation messages broadcast by the hybrid constellation of satellites in Geostationary Earth Orbit (GEO), Inclined Geo-Synchronization Orbit (IGSO), and Medium Earth Orbit (MEO). Next, the innovative design and operation of the control segment are discussed. Finally, highlights of the unique usage algorithm of the BDS navigation message information are presented, such as the BDS satellite clock correction and TGD parameters, satellite ephemeris and almanac, and ionospheric delay parameters.

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“…When these satellites are in the deep Earth eclipsing period, the yaw angle is always zero and the Orbit-Normal (ON) mode is employed. The yaw attitude mode of the GEOs is always in ON mode (Li et al, 2015). The orbit accuracy in the YS mode is stable (Steigenberger et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Orbit and Positioning Accuracy for New Generation Beidou Satellites during the Earth Eclipsing Period

Hu²,

Guo

et al. 2018

J. Navigation

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The Beidou System (BDS) started functioning at the end of 2012. The Yaw-Steering (YS) attitude mode for Inclined Geosynchronous Orbit (IGSO) and Medium Earth Orbit (MEO) satellites in BDS ensures that the solar panels face the Sun. The orbit radial accuracies for IGSO/MEO satellites are 0·5 m and the User Equivalent Range Errors (UERE) are 1·5 m in YS mode. BDS-2 satellites adopt Orbit-Normal (ON) mode to meet the power supply and thermal control requirements of the satellite during deep Earth eclipse periods. In ON mode, long-term orbit ephemeris accuracy monitoring in the Operational Control System (OCS) of BDS indicates that the orbit accuracies for IGSO/MEOs are reduced to a few hundreds of metres, seriously affecting the positioning accuracy and navigation service capability of the BDS system. Solar Radiation Pressure (SRP) is difficult to model in ON mode. Continuous Yaw-Steering (CYS) mode is available for new generation Beidou satellites launched since 2015. The orbit accuracies for these new generation Beidou (BDS-3) satellites were estimated based on BDS monitoring station data and SRP models including ECOM 9/5/3. The evaluation method consisted of four steps, namely, orbit internal consistency analysis, UERE calculation, Satellite Laser Ranging (SLR) data fitting Root Mean Square (RMS) determinations and positioning performance analysis; the data gathering period lasted for more than 60 days and included two CYS periods and one ON period. The experiments showed that the orbit accuracy of the radial component in CYS mode for the BDS-3 satellites degrades by 2 to 3 cm and positioning accuracy degrades only by 1 cm over that in YS mode which is just a small reduction in accuracy compared with the decimetre-level BDS orbit accuracy and the metre-level single point positioning accuracy with BDS pseudorange data. This overcomes declining orbit and positioning accuracy issues in ON mode for BDS-2 satellites. Other results also show that the reliability of BDS has been improved.

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Orbit determination and prediction for Beidou GEO satellites at the time of the spring/autumn equinox

Cited by 13 publications

References 6 publications

BeiDou Satellite Unhealthy States and the Impact on System Performance

BeiDou Satellite Unhealthy States and the Impact on System Performance

Improved design of control segment in BDS‐3

Orbit and Positioning Accuracy for New Generation Beidou Satellites during the Earth Eclipsing Period

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