Refinement of the Orbit of the Space Radio Telescope in the Millimetron (Spektr-M) Project

As part of the creation of the Millimetron Space Observatory, the task was set to develop a reliable tool for ballistic and navigational support of the Spektr-M spacecraft. This article describes software developed to determine and refine the orbital parameters of spacecraft, including the Millimetron Observatory. This paper briefly describes the project of the Spektr-M observatory, algorithms for determining the orbit, and presents the results of the software. In addition, the number of ground-based tracking stations was estimated for optimal measurements of the orbit of the Spektr-M spacecraft to ensure the required orbital accuracy and to reduce the time the space observatory is out of sight. The implemented algorithms were tested on model and real observation data.