Pseudorange Bias Analysis and Preliminary Service Performance Evaluation of BDSBAS

Liu, Yuchen; Cao, Yue; Tang, Chengpan; Chen, Jinping; Zhao, Liqian; Zhou, Shanshi; Hu, Xiaogong; Tian, Qiuning; Yang, Yufei

doi:10.3390/rs13234815

Cited by 12 publications

(4 citation statements)

References 18 publications

(23 reference statements)

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“…Then, the velocity of GEO related to antenna ground is slow, and the altitude angle and azimuth angle of tracked antenna nearly remain unchanged. Lastly, GEOs need to broadcast the messages of other services, including Satellite Based Augmentation System Service (SBAS) [30,31] and Precise Point Position Service in B2b signal (PPP-B2b) [32]. The above services require MCS to use antennas with a larger diameter and greater signal transmission power to track GEOs full time, which will help suppress the multipath effect in two-way observation.…”

Section: Estimation Of Clock Offsets With Respect To Bdtmentioning

confidence: 99%

High-Accuracy Clock Offsets Estimation Strategy of BDS-3 Using Multi-Source Observations

et al. 2022

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Satellite clock offsets are the critical parameters for The Global Navigation Satellite Systems (GNSSs) to provide position and timing (PNT) service. Unlike other GNSSs, BDS-3 uses the two-way superimposition strategy to measure satellite clock offsets. However, affected by some deficiencies of the two-way superimposition strategy, the accuracy of BDS-3 clock offsets parameters is 1.29 ns (RMS), which is the main bottleneck for BDS-3 to improve its space signal accuracy. After analyzing problems in the clock offsets measurement process of BDS-3, the paper proposes a new strategy to real-time estimate high-accuracy satellite clock offsets. The clock offsets estimated by the new strategy show a good consistency with GBM clock offsets. The averaged STD of their differences in MEO is 0.14 ns, and the clock offsets estimated by the new strategy present less fluctuation in the 1-day fitting residuals. Applying the new clock offsets to prediction, BDS-3 can reduce its clock offsets errors from 1.05 ns to 0.29 ns (RMS), about 72%. The above results indicate that the new clock offsets estimated strategy can improve the accuracy of clock offsets parameters of BDS-3 effectively.

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Section: Estimation Of Clock Offsets With Respect To Bdtmentioning

confidence: 99%

High-Accuracy Clock Offsets Estimation Strategy of BDS-3 Using Multi-Source Observations

et al. 2022

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“…However, these basic services are not adequate for high‐end users who require high‐precision positioning and reliable integrity, including counterterrorism squads and civil aviation organisations. In this case, some countries and regions have established satellite‐based augmentation systems (SBASs) to solve the issue of service blind spots existing in general GNSSs, including America's Wide Area Augmentation System (WAAS), Russia's System for Differential Correction and Monitoring (SDCM), Europe's Geostationary Navigation Overlay Service (EGNOS) and China's BeiDou SBAS (BDSBAS) [3].…”

Section: Introductionmentioning

confidence: 99%

Fast GPU based acquisition with minimum loss and downsampling techniques for weak BeiDou SBAS signals

Tang

Chen

et al. 2023

IET Radar Sonar & Navi

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For a receiver of the BeiDou Satellite Based Augmentation System (BDSBAS), the acquisition aims to coarsely estimate the pseudo-code delays and carrier Doppler shifts of the received signals. The use of downsampling techniques to accelerate this acquisition process for weak signals has been an emerging topic. However, the acquisition probabilities of conventional algorithms with downsampling are inadequate and need to be enhanced to prevent excessive false alarms due to degradation of the peak signal-to-noise ratios (PSNRs) during acquisition. To improve signal acquisition performance, we introduce an enhancer function before downsampling to achieve the minimum PSNR loss during acquisition. Then, we use graphic processing unit (GPU) functions to speed up the processing loop, matrix multiplication and fast Fourier transform operations. We thus present a fast GPUbased acquisition method by using minimum loss and downsampling techniques. Our experimental results show the remarkable effectiveness of our method for receiving weak BDSBAS signals as compared to legacy downsampling algorithms. This work seeks not only to solve the current issue of achieving fast acquisition of weak BDSBAS signals but also to inspire creative new ideas that spur further advances in this promising field in the future.

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“…Current global SBAS operational systems include the Wide Area Augmentation System (WAAS) of the United States which has been operational since 2003 and can support The BDSBAS SF service has already begun to provide initial service since 31 July 2020. Reference [20] shows the BDSBAS general design, system time datum, coordinate reference system and signal characteristics, [21] analyzed the pseudorange bias errors of BDSBAS monitoring receivers and their effect on the performance of the BDSBAS service. A general aviation flight test performance of BDSBAS was given by [22].…”

Section: Introductionmentioning

confidence: 99%

Development Status and Service Performance Preliminary Analysis for BDSBAS

et al. 2022

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The BeiDou global navigation satellite system (BDS-3) provides positioning, navigation and timing services for global users, moreover, it provides BDS satellite-based augmentation system (BDSBAS) single-frequency (SF) and dual-frequency multi-constellation (DFMC) services for users in China and its surrounding areas. The BDSBAS SF service is in accordance with Radio Technical Commission for Aeronautics (RTCA) standard protocol (RTCA MOPS) and augment GPS constellation, while the BDSBAS DFMC service is in line with SBAS L5 DFMC standard protocol and is aimed at supporting any combination of BDS/GPS/Galileo/GLONASS constellations, including only a single constellation operation. We introduced the development status of the BDSBAS system, including the system architecture and navigation user algorithms. Based on the GPS measurements, the accuracy, integrity and availability of the BDSBAS SF service were evaluated, and with the BDS measurements, the accuracy of the BDSBAS DFMC service was preliminarily analyzed. The integrity and availability of the BDSBAS DFMC service will be discussed in future work as some of the DFMC integrity parameters are still under discussion for optimization. The results show that, for BDSBAS SF service, the horizontal and vertical position accuracy were about 1.0 m and 2.0 m (95%), respectively, which were improved by 39% and 33%, respectively, compared with the GPS SF position accuracy. For BDSBAS DFMC service, the horizontal and vertical position accuracy were about 0.6 m and 1.2 m (95%), respectively, which were improved by about 25% and 20% compared with the BDS dual-frequency position accuracy. No system integrity risk event was detected during the testing period for BDSBAS SF service. The average availability of the BDSBAS SF service was about 98% which was mainly affected by the availability of ionospheric grid delay corrections.

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Pseudorange Bias Analysis and Preliminary Service Performance Evaluation of BDSBAS

Cited by 12 publications

References 18 publications

High-Accuracy Clock Offsets Estimation Strategy of BDS-3 Using Multi-Source Observations

High-Accuracy Clock Offsets Estimation Strategy of BDS-3 Using Multi-Source Observations

Fast GPU based acquisition with minimum loss and downsampling techniques for weak BeiDou SBAS signals

Development Status and Service Performance Preliminary Analysis for BDSBAS

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