The contribution of intersatellite links to
            <scp>BDS</scp>
            ‐3 orbit determination: Model refinement and comparisons

Wang, Chen; Zhao, Qile; Guo, Jing; Liu, Jingnan; Chen, Gucang

doi:10.1002/navi.295

Cited by 57 publications

(31 citation statements)

References 16 publications

(24 reference statements)

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“…Precise BDS-3 products of Wuhan University (WUM) [25] are used here. Although no exact precision of the WUM products is reported for BDS-3 satellites, previous research indicates that the average 3D orbit RMS is better than 20 cm [11][12][13], as there are still not many stations tracking BDS-3 satellites. Comparing with the 0.5-1.0 m level precision of broadcast ephemeris, WUM products would be sufficient to assess the SISRE of BDS broadcast ephemeris.…”

Section: Signal In Space Range Errormentioning

confidence: 96%

Initial Positioning Assessment of BDS New Satellites and New Signals

et al. 2019

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With the official announcement of open service since the end of 2018, the BeiDou navigation satellite system (BDS) has started to provide global positioning, navigation and timing (PNT) services. Thus, it is worth assessing the positioning service of new BDS satellites and signals. In this paper, we comprehensively assess the system status and the global positioning performance of BDS regarding single point positioning (SPP) and real-time kinematic (RTK) performance. Results show that the signal in space range error (SISRE) of BDS-3 satellites is superior to that of BDS-2 satellites, showing an overall accuracy of 0.71 m versus 0.97 m, which is competitive with GPS and Galileo. With the contribution of BDS-3, the number of global average visible satellites has increased from 5.1 to 10.7, which provides a mean global position dilution of precision (PDOP) value better than 6 at 99.88% and the mean availability of basic PNT performance is also improved from 35.25% to 98.84%. One week of statistical results from 54 globally distributed international GNSS service (IGS) stations show that the root mean square (RMS) of SPP accuracy is 1.1 m in horizontal and 2.2 m in vertical, which is at the same level of GPS. The new B1c and B2a signals show a smaller observation noise than B1I, and SPP performance of B1c is similar to that of B1I. However, the positioning precision is slightly worse at the B2a frequency, which may be due to the inaccurate BDS ionosphere correction. As for short baseline RTK, baseline accuracy is also improved due to the increased number of new BDS satellites.

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Section: Signal In Space Range Errormentioning

confidence: 96%

Initial Positioning Assessment of BDS New Satellites and New Signals

et al. 2019

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“…When comparing the precise products with the BDS broadcast ephemeris, the difference in the time and coordinate reference system, satellite antenna offset correction, and clock offset correction should be considered [15]. It should be pointed out that, different from the traditional B1I/B2I ionosphere-free (IF) combination, the WUM products apply the B1I/B3I IF combination for precise orbit determination, as the B2I signal is not supported by BDS-3 satellites [16].…”

Section: Beidou Broadcast Ephemeris Errormentioning

confidence: 99%

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

et al. 2020

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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.

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“…宋小勇 [24] 利用仿真数据给出了时分体制星间链路数据处理模型, 并对分布式自主定轨进行了试验分析. Wang等人 [25] 针对北斗三号星座, 分析了星间链路对定轨的贡献. 龚晓颖等人 [26] 详细分析了锚固站对北斗星座自主导航的精度影响.…”

Section: 国内学者也开展了自主导航技术方面的研究耿unclassified