Aerospace Instrument-Making Annotation << Back Geometry of base surfaces of circumterraneous navigating space A.V. Babichenko The problems of building a mathematical model of near-Earth navigational environment are considered: rigorous description of assemblage of location surfaces equidistant to terrestrial ellipsoid, methods and algorithms of solving main geodesic problems for these surfaces, presentation of navigational environment as Riemann one and definition of its metric properties. E-mail: rpkb@spase.ru