Оптимальное использование космических аппаратов ГНСС в функциональных дополнениях SBAS и GBAS

Abstract

The article discusses a method for improving the quality of navigation services for consumers with increased requirements for accuracy and reliability using satellite-based augmentation systems (SBAS) and ground-based augmentation systems (GBAS). Augmentation systems provide users with corrections that are used to correct GNSS measurements and integrity information. Due to the existing restrictions on the number of satellites for which corrections are transmitted, the article proposes the optimal use of GPS satellites, which is an incomplete set of 27 satellites that will be used in the GLONASS/GPS/SBAS navigation service, while measurements of the full constellation of GLONASS satellites are used for positioning. It is proposed to carry out the choice of 27 from the existing constellation of 32 GPS satellites in such a way that the subsystem provides the maximum efficiency of using the GNSS signals. The optimization problem or finding the optimal set of excluded GNSS satellites is solved according to R. Bellman’s algorithm. The found optimal set of excluded GNSS satellites makes it possible to reduce VDOP in comparison with the non-optimal one by almost 24 % and thereby improve navigation performance using GLONASS/GPS signals and SBAS corrections.