| Citation: | CHEN Shanshan, JIN Biao, ZHAO Liqian, et al. Dynamic SBAS message scheduler algorithm[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(10): 1996-2005. doi: 10.13700/j.bh.1001-5965.2020.0375(in Chinese)
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Satellite Based Augmentation Systems (SBAS) provide SBAS messages through GEO satellites to improve the performance of GNSS in order to meet the navigation needs of civil aviation users, and reasonable and effective message content and broadcast schedule design are important for SBAS to achieve high-quality services. In order to improve the flexibility of message scheduler and avoid the waste of broadcast resources caused by filling the null messages, this paper proposes an automatic scheduler of SBAS message. Under the premise of meeting the requirements of international standards, this scheduler comprehensively uses the age of SBAS message and the maximum broadcast period to realize the automatic selection of the message type to be broadcast. At the same time, this paper uses NTMF data to analyze the characteristics of the current SBAS message, and evaluates the application effect of the proposed scheduler in single- and dual-frequency SBAS message. The results show that this scheduler can ensure that the message schedule meets the requirements of international standards, can achieve the priority broadcast of important messages, and can realize the nearly equal proportion shortening of the broadcast interval of each message type by dynamic allocation of spare time slot. Compared with rigid scheduler, the integrity message broadcast interval is shortened by about 15.0% and the first positioning time is shortened by about 8% for the single-frequency SBAS, and the first positioning time is shortened by about 6.5% for the dual-frequency SBAS message. Compared with BDSBAS B1C rigid scheduler, the integrity message broadcast interval is shortened by about 14.7% and the first positioning time is shortened by about 16.7%. The scheduler can effectively improve the efficiency of SBAS message broadcasting and realize 100% effective use of SBAS broadcast resource.
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