Orbit and clock analysis of BDS-3 satellites using inter-satellite link observations

Xie, Xin; Geng, Tao; Zhao, Qile; Lv, Yongfeng; Cai, Hansheng; Liu, Jingnan

doi:10.1007/s00190-020-01394-4

Cited by 30 publications

(14 citation statements)

References 30 publications

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“…Besides, the different characteristics are also observed for the clocks determined with L-band and ISL data separately, as shown in Xie et al (2020). As the noise level of Ka-band ISL measurements is about 10 times higher than that of the L-band carrier phase observations, the clocks derived with ISL data display a superposition of random walk and white noises, and the corresponding Allan Derivation (ADEV) with the sampling interval of 2000 s is generally worse than that of the L-band clocks.…”

Section: Consistent Orbits and Clocks From Isl And L Band Datamentioning

confidence: 93%

“…Furthermore, Xie et al (2020) identifies that the post-fit residuals of ISL clock-free observables for some satellite pairs have constant biases, as shown in Fig. 8, when the satellite-dependent transmitter and receiver hardware delays are estimated.…”

Section: Systematic Errors In Isl Datamentioning

confidence: 99%

“…Once the ISL data is combined with the ground tracking data, the 3D accuracy is improved to 7 cm, 13 and 20 cm for MEO, IGSO, and GEO, respectively (Lv et al, 2020). For the ISL-only clock estimation, although the accuracy of the clock estimated by ISL observations is about 0.2-0.3 ns due to larger noises of ISL, the estimated clocks are free of orbit errors (Xie et al, 2020) and show better stability in a long period. The analysis performed by Cai et al (2020) indicated that the ISL data from different orbit planes contribute to POD more than that from the same plane, as they have better observation geometry.…”

Section: With Inter-satellite-link Datamentioning

confidence: 99%

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Precise orbit determination for BDS satellites

et al. 2022

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Since the first pair of BeiDou satellites was deployed in 2000, China has made continuous efforts to establish its own independent BeiDou Navigation Satellite System (BDS) to provide the regional radio determination satellite service as well as regional and global radio navigation satellite services, which rely on the high quality of orbit and clock products. This article summarizes the achievements in the precise orbit determination (POD) of BDS satellites in the past decade with the focus on observation and orbit dynamic models. First, the disclosed metadata of BDS satellites is presented and the contribution to BDS POD is addressed. The complete optical properties of the satellite bus as well as solar panels are derived based on the absorbed parameters as well the material properties. Secondly, the status and tracking capabilities of the L-band data from accessible ground networks are presented, while some low earth orbiter satellites with onboard BDS tracking capability are listed. The topological structure and measurement scheme of BDS Inter-Satellite-Link (ISL) data are described. After highlighting the progress on observation models as well as orbit perturbations for BDS, e.g., phase center corrections, satellite attitude, and solar radiation pressure, different POD strategies used for BDS are summarized. In addition, the urgent requirement for error modeling of the ISL data is emphasized based on the analysis of the observation noises, and the incompatible characteristics of orbit and clock derived with L-band and ISL data are illuminated and discussed. The further researches on the improvement of phase center calibration and orbit dynamic models, the refinement of ISL observation models, and the potential contribution of BDS to the estimation of geodetic parameters based on L-band or ISL data are identified. With this, it is promising that BDS can achieve better performance and provides vital contributions to the geodesy and navigation.

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Section: Consistent Orbits and Clocks From Isl And L Band Datamentioning

confidence: 93%

Section: Systematic Errors In Isl Datamentioning

confidence: 99%

Section: With Inter-satellite-link Datamentioning

confidence: 99%

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Precise orbit determination for BDS satellites

et al. 2022

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“…Since the satellite's clock offset estimated by ground tracking observation may absorb orbit errors, the periodic variation of a BDS-3 onboard clock may be related to the orbital period of the satellite [16,30,31]. According to the results of spectrum analysis, the amplitude of IGSO satellite clocks is much greater than that of the MEO satellite clocks, which is consistent with the poor orbit determination accuracy of the IGSO satellite.…”

Section: Spectrum Analysismentioning

confidence: 77%

Analysis of BDS-3 Onboard Clocks Based on GFZ Precise Clock Products

Geng

Jiang

et al. 2022

Remote Sensing

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The characteristics and performance of satellite clocks are important to the positioning, navigation, and timing (PNT) services of Global Navigation Satellite System (GNSS) users. Although China’s BeiDou-3 Navigation Satellite System (BDS-3) has been fully operational for more than one year, there is still a lack of comprehensive research on the onboard clocks of the entire BDS-3 constellation. In this study, the precise clock products of GeoForschungsZentrum (GFZ) from day-of-year (DOY) 1, 2021 to DOY 300, 2021 were used to analyze the characteristics and performance of BDS-3 onboard clocks from the following aspects: clock bias, frequency, drift rate, fitting residuals, periodicity, and frequency stability. Compared with BDS-2, the clock quality of BDS-3 satellites has been greatly improved, but there are still jumps in the clock offsets and frequency series of BDS-3 clocks. The drift rate of BDS-3 clocks varies within the range between −2×10−18 and 2×10−18 s/s2. The daily model fitting residuals of passive hydrogen masers (PHM) on BDS-3 medium Earth orbit (MEO), inclined geosynchronous orbit (IGSO), and geostationary (GEO) satellites are 0.15, 0.28, and 0.46 ns, respectively. The overlapping Allan deviation (OADEV) of BDS-3 MEO clocks is 4.0 × 10−14 s/s at a time interval of 1000 s. The PHMs on BDS-3 MEO satellites exhibit fewer periodic signals than those of Rb clocks. In addition, the precise clock offsets of the BDS-3 PHMs carried on the MEO, IGSO, and GEO satellites show different periodicities, which are similar to those of the corresponding types of BDS-2 satellites.

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“…BDS-2 data processing has drawn a lot of attention from the GNSS community in the past several years [ 1 , 2 , 3 , 4 , 5 ]. With the availability of BDS-3 real data, many researchers focused on the various aspects of BDS-3, including broadcast ephemeris [ 6 ], satellite signals [ 7 ], global broadcast ionospheric delay correction model [ 8 , 9 ], satellite-induced code bias [ 10 ], time group delay (TGD) [ 11 ], orbit determination [ 12 , 13 , 14 ], differential code bias (DCB) [ 15 , 16 ], orbit and clock analysis [ 17 ], and time and frequency transfer [ 18 ]. In actuality, for a navigation satellite system, positioning is one of the core functions and basic services.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Real-Time Precise Point Positioning with Both BDS-3 and BDS-2 Observations

Pan

et al. 2020

Sensors

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For time-critical precise applications, one popular technology is the real-time precise point positioning (PPP). In recent years, there has been a rapid development in the BeiDou Navigation Satellite System (BDS), and the constellation of global BDS (BDS-3) has been fully deployed. In addition to the regional BDS (BDS-2) constellation, the real-time stream CLK93 has started to support the BDS-3 constellation, indicating that the real-time PPP processing involving BDS-3 observations is feasible. In this study, the global positioning performance of real-time PPP with BDS-3/BDS-2 observations is initially evaluated using the datasets from 147 stations. In the east, north and upward directions, positioning accuracy of 1.8, 1.2 and 2.5 cm in the static mode, and of 6.7, 5.1 and 10.4 cm in the kinematic mode can be achieved for the BDS-3/BDS-2 real-time PPP, respectively, while the corresponding convergence time with a threshold of 10 cm is 32.9, 23.7 and 32.8 min, and 66.9, 42.9 and 69.1 min in the two modes in the three directions, respectively. To complete this, the availability of BDS-3/BDS-2 constellations, the quality of BDS-3/BDS-2 real-time precise satellite products, and the BDS-3/BDS-2 post-processed PPP solutions are also analyzed. For comparison, the results for the GPS are also presented.

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Orbit and clock analysis of BDS-3 satellites using inter-satellite link observations

Cited by 30 publications

References 30 publications

Precise orbit determination for BDS satellites

Precise orbit determination for BDS satellites

Analysis of BDS-3 Onboard Clocks Based on GFZ Precise Clock Products

Performance Evaluation of Real-Time Precise Point Positioning with Both BDS-3 and BDS-2 Observations

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