Shyshkov F. Autonomous navigation of service space vehicles using the signals of the global navigation satellite system

In the dissertation, the author improved the model of the radionavigation field for the autonomous satellite navigation of service space vehicles in the geostationary orbit in the field of space service. The improved model allows to evaluate the navigational characteristics of the target using the signals that are passing through the main and side lobes of the antenna pattern of the navigational satellites of one or more global navigation satellite system (GNSS) constellations. To present the results, the author developed a graphic-analytic model of the integrated assessment of the quality of navigation in the geostationary orbit using the GNSS signals, which allows to display the values of accuracy and availability for various typical operations, for an array of positions of the service spacecraft in orbit. The author proposed a method of modeling navigation characteristics using GNSS signals in a geostationary orbit using a terrestrial hardware-software complex, which allows to evaluate the characteristics in laboratory conditions. The author evaluates the parameters of accuracy and accessibility for service spacecraft in the near-Earth space. The navigation situation in the geostationary orbit has been simulated using the hardware-software complex. The author also investigated the peculiarities of the separate use of frequencies L1 and L2 of the GPS system for the space navigation problem.