Initial assessment of BDS-3 preliminary system signal-in-space range error

Lv, Yongfeng; Geng, Tao; Zhao, Qile; Xie, Xin; Zhou, Rongjia

doi:10.1007/s10291-019-0928-x

Cited by 55 publications

(31 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In October 2019, the BeiDou constellation consisted of 34 active satellites and nine satellites not included in the operational mode (4 experimental BeiDou-3S and 5 BeiDou-3). BeiDou-2 includes five GEO, seven IGSO, and three MEO satellites, whereas BeiDou-3 comprises 18 MEO and one IGSO active spacecraft manufactured by SECM and CAST (Lv et al 2020). The characteristics of the Chinese constellation can be followed at the MGEX Web site (https ://mgex.…”

Section: Beidoumentioning

confidence: 99%

Quality assessment of experimental IGS multi-GNSS combined orbits

et al. 2020

View full text Add to dashboard Cite

The International GNSS Service (IGS) Analysis Center Coordinator initiated in 2019 an experimental multi-GNSS orbit combination service by adapting the current combination software that has been used for many years for IGS GPS and GLONASS combinations. The multi-GNSS orbits are based on individual products generated by IGS and multi-GNSS Pilot Project analysis centers. However, the combinations are not yet considered to be the final products at this time. The goal of this research is to provide a quality assessment of the very first IGS experimental multi-GNSS combined orbits based on Satellite Laser Ranging (SLR) observations and the mean position errors from the orbit combinations. The errors available in the combined orbit files provide information about the consistency between orbits from different analysis centers, whereas SLR provides independent orbit validation results even for those satellites which are considered only by one analysis center, and thus, the quality of the combination is not provided in the orbit files. We found that the BeiDou-3 satellites manufactured by China Academy of Space Technology and Shanghai Engineering Center for Microsatellites are characterized by opposite SLR residual dependencies with respect to the position of the sun which means that the orbit models for BeiDou-3 need further improvement. Smallest SLR residuals are obtained for Galileo, GLONASS-K1, and GLONASS-M+. However, the latter is characterized by a bias of + 29 mm. The mean standard deviations of SLR residuals are 23, 29, 87, 51, 40, and 72 mm for Galileo, GLONASS, BeiDou GEO, BeiDou IGSO, BeiDou MEO, and QZSS, respectively. The mean orbit combination errors in the radial direction are three times lower than those from SLR residuals in the case of MEO satellites and vary between 8 and 14 mm, whereas the orbit errors are four times lower than SLR residuals in the case of GEO and IGSO and equal to 11-21 mm.

show abstract

Section: Beidoumentioning

confidence: 99%

Quality assessment of experimental IGS multi-GNSS combined orbits

et al. 2020

View full text Add to dashboard Cite

show abstract

“…This implies that the α • R − Clk bias is different for each satellite and each frequency. Therefore, it is not proper to attribute the bias to clock bias as pointed by Lv et al [10]. Meanwhile, for B3I and B1I/B3I, a noticeable systematic bias between BDS-2 and BDS-3 can be found.…”

Section: Beidou Broadcast Ephemeris Errormentioning

confidence: 97%

“…Wang et al [9] inferred that independent receivers are employed at the monitoring stations for BDS-2 and BDS-3. For BDS-3, Lv et al [10] assessed the broadcast orbit and clock accuracy by comparing with precise orbit and clocks and found a nonzero mean bias of BDS-3 clocks. However, no explanation of how the clock bias comes about was given.…”

Section: Introductionmentioning

confidence: 99%

“…The motivation of this contribution was to investigate and calibrate the satellite-dependent TGD bias with the current BDS constellation. Other than Wang et al [9] and Lv et al [10], we calibrate the satellite-dependent bias for BDS-2 and BDS-3 and attribute this bias to a TGD bias, which is frequency dependent and validated by orbit and clock comparison and network solution. The paper is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Calibration and Impact of BeiDou Satellite-Dependent Timing Group Delay Bias

et al. 2020

View full text Add to dashboard Cite

The accuracy of the timing group delay (TGD) transmitted in the broadcast ephemeris is an important factor that affects the service performance of a GNSS system. In this contribution, an apparent bias is found by comparing the orbit and clock difference using half-year data of the BeiDou navigation satellite system (BDS) broadcast ephemeris and precise post-processed products. The bias differs at each satellite on each frequency and shows a general systematic difference between BDS-2 and BDS-3. We attribute this to the satellite-dependent TGD bias of the BDS broadcast ephemeris, which is subsequently calibrated. Moreover, to calibrate the bias independently, a network solution strategy is proposed based on 87 globally distributed multi-GNSS experiment (MGEX) stations spanning 25 weeks. The estimated bias shows good agreement with the values observed from the orbit and clock comparison. For the validation of the bias, we compared the signal-in-space range error (SISRE) performance with and without the TGD bias correction. The results show that the SISRE of the BDS improved from 0.71, 0.81, and 1.40 m to 0.64, 0.66, and 0.64 m in the B1I, B3I, and B1I/B3I frequencies. For BDS-3, the SISRE is well within 0.50 m after the bias correction. To further validate the bias, a week’s data were collected at 97 globally distributed MGEX stations. When the TGD bias is corrected, the root mean square (RMS) of single point positioning (SPP) can be improved by 5.6, 8.4, and 21.6% in the B1I, B3I, and B1I/B3I frequencies. Meanwhile, the SISRE and SPP assessment results also indicate that the TGD bias should be corrected by each satellite rather than only corrected between BDS-2 and BDS-3.

show abstract

“…BDS was developed in three phases. As a demonstration system, BeiDou navigation demonstration system (BDS-1) already completed its mission and ceased its services (Lv et al 2020). As a regional system serving the Asia-Pacific region, BDS-2 is currently operating and provides stable Positioning, Navigation, And Timing (PNT) services with a constellation of five satellites in GEostationary Orbit (GEO), seven in an Inclined GeoSynchronous Orbit (IGSO), and three in Medium-altitude Earth Orbit (MEO) (CSNO 2017; Shi et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Initial assessment of single- and dual-frequency BDS-3 RTK positioning

Yuan

Zhang

2020

Satell Navig

View full text Add to dashboard Cite

The BeiDou navigation satellite system with global coverage (BDS-3) has been fully operational since July 2020 and provides comprehensive services to global users. BDS-3 transmits several new navigational signals based on the signals inherited from the BeiDou navigation satellite (regional) system (BDS-2). Previous studies focused on the positioning performance of BDS-2 plus BDS-3 and that of combining BDS-3 and other Global Navigation Satellite Systems (GNSSs), but there was no in-depth discussion on the positioning performance of the BDS-3-only. In this contribution, the BDS-3-only Real-Time Kinematic (RTK) positioning is analysed using the data collected in zero and short baselines in Wuhan, China. The RTK model based on Single-Differenced is first presented, and the BDS-3-only RTK positioning in cases of single and dual-frequencies is evaluated with the model in terms of the empirical integer ambiguity resolution success rates and positioning accuracy. Our numerical tests suggest two major findings. First, the positioning performance for the B1I and B3I retained from BDS-2 and the new frequency B1C is comparable, while that for the new frequency B2a is poorer. Second, the positioning performance of the new frequency combination of the B1C + B2a is not as good as that of the B1C only, owing to the unrealistic stochastic model used.

show abstract

Initial assessment of BDS-3 preliminary system signal-in-space range error

Cited by 55 publications

References 29 publications

Quality assessment of experimental IGS multi-GNSS combined orbits

Quality assessment of experimental IGS multi-GNSS combined orbits

Calibration and Impact of BeiDou Satellite-Dependent Timing Group Delay Bias

Initial assessment of single- and dual-frequency BDS-3 RTK positioning

Contact Info

Product

Resources

About