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satellite integrity monitoring for satellite-based augmentation system:an improved covariance-based method

satellite Navigation 2022年第1期3卷 74-84,I0003页

作者： Shuaiyong Zheng Mengzhi Gao Zhigang Huang Xiaoqin Jin Kun Li School of Integrated Circuit Science and Engineering Tianjin University of TechnologyNo.391 Bin Shui Xi Dao RoadXiqing DistrictTianjin 300384China School of Electronic and Information Engineering Beihang UniversityNo.37 Xueyuan RoadHaidian DistrictBeijing 100191China Tianjin Navigation Instrument Research Institute No.268 No.1 RoadDing Zi Gu StreetHongqiao DistrictTianjin 300131China

satellite integrity monitoring is vital to satellite-based augmentation systems,and can provide the confdence of the diferential corrections for each monitored satellite satisfying the stringent safety-of-life *** integrity information includes the user diferential range error and the clock-ephemeris covariance which are used to deduce integrity ***,the existing direct statistic methods sufer from a low integrity bounding *** address this problem,we develop an improved covariance-based method to determine satellite integrity information and evaluate its performance in the range domain and position *** with the direct statistic method,the integrity bounding percentage is improved by 24.91%and the availability by 5.63%.Compared with the covariance-based method,the convergence rate for the user diferential range error is improved by 8.04%.The proposed method is useful for the satellite integrity monitoring of a satellite-based augmentation system.

关键词： Clock-ephemeris covariance matrix Groove model satellite-based augmentation system Scale model User diferential range error

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Potential Performance of satellite-based augmentation system based on CMONOC in China

Potential Performance of Satellite-Based Augmentation System...

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第十三届中国卫星导航年会

作者： Shuaiyong Zheng Mengzhi Gao Kun Li Xiaoqin Jin Juan Qin Dan Xia Department School of Integrated Circuit Science and Engineering Tianjin University of Technology Tianjin Navigation Instrument Research Institute

To satisfy the requirement of aviation navigation, many countries are committed to the development of Global Navigation satellite system（GNSS） augmentation systems, especially satellite-based augmentation system（SBAS）, to improve the accuracy, integrity, continuity and availability of GNSS. SBAS has been an important solution to improve the comprehensive performance of GNSS for many years. Typically, SBAS in North America and Europe can provide Localizer Performance with Vertical guidance 200（LPV200） services for their civil aircraft. The services provided by SDCM, MSAS, KASS and GAGAN have been gradually covering the surroundings of China. As both the SF service and the DFMC service provided by BeiDou satellite-based augmentation system（BDSBAS） are being tested, it is urgent to perform the research of SBAS to provide technical support for the construction and subsequent performance improvement of BDSBAS. To improve the processing efficiency of BDSBAS, an architecture of system segment is designed for BDSBAS. Also, considering the problem that it is difficult to guarantee the satellite integrity in the edge area of the monitoring network, a pseudorange residual and satellite-station geometry-based method is proposed to perform satellite integrity monitoring. Results reveal that compared with the direct statistic method, the integrity bounding rate in the pseudorange domain and the availability in the position domain are improved by 45.39% and 2.32% respectively. The designed system can provide Approach Procedure with Vertical Guidance-I（APV-I） services for most parts of China and even LPV200 services for some parts of China.

关键词： satellite-based augmentation system system Segment satellite Corrections satellite Integrity Service Performance

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Estimation method of SBAS dual-frequency range error integrity parameter

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satellite Navigation 2020年第1期1卷 93-100页

作者： Bo Shao Qun Ding Xianbing Wu The 20th Research Institute of CETC Xi’an 710068ShaanxiChina

The development of a dual-frequency multi-constellation satellite-based augmentation system(DFMC SBAS)is in progress *** broadcasted dual-frequency range error(DFRE)integrity parameter reflects the effects of satellite ephemeris and clock corrections.A user uses the DFRE to calculate the protection level and then determines whether the DFMC SBAS service satisfies the requirements of the current flight ***,the calculation of the DFRE has not been ***,a DFRE estimation method is proposed based on the projection *** the ephemeris-clock covariance matrix of each satellite,the maximal projection direction was solved,and the projection of the covariance matrix on this direction was used as the DFRE to form an envelope for the maximal corrected *** show that the DFRE can form an envelope of the maximal corrected error with a set probability,and the integrity performance in the user segment satisfies the Category I precision approach requirement.

关键词： satellite-based augmentation system Dual-frequency multi-constellation Dual-frequency range error Integrity

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