Study of options for constructing a low-orbit addition to the global navigation satellite system

The possibility of using a low-orbit addition to the global navigation satellite system GLONASS based on small navigation spacecraft is being considered. In the class of delta systems, options and characteristics of orbital structures are defined, ensuring the specified requirements for the accessibility of the navigation field in relation to shading angles up to 25°. Estimates of the contribution of the considered variants of structures to improving the characteristics of the navigation field of the GLONASS orbital constellation were obtained.