I. INTRODUCTIONGlobal navigation satellite systems (GNSS) -one of the simplest and cheapest methods of navigation in modern society. This is not surprising -the users only have to purchase a receiver, since the main system is free and publicly available (the constellation owners pay cost of maintaining the system). Over the years of its work, satellite navigation has been used in different spheres of society, including transport, agriculture, tourism, navigation, etc. Despite the fact that the system was originally designed to be used on the surface of the Earth or near the lower Earth orbits that is called Terrestrial service volume (TSV), GNSS can be used for navigation in the near-Earth space that was named space service volume (SSV).
While facing different tasks in space, the necessity to create a reliable way of navigation for different manned on unmanned vehicles in space is required. The model in this work was created in MATLAB software package to analyze the availability of the navigation satellites in space, coordinates estimation and allows simulating different parameters. A way to navigate in space for a space vehicle is required for multiple purposes, like so-called "orbital service" or space debris extraction. Satellite navigation seems to be a cheap system for navigation in space, thus allowing to use existing system framework with only adding an extremely sensitive receiver.
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