Stations of tracciamento and center of calculation

The tracciamento of the satellites comprises all those operations apt to determine the parameters of the orbit. To that they exactly supply 4 master stations said of tracciamento (main tracking stations) and a calculation center (computing center), all situate to you in USA territory, and in particular to Wahiova (Hawaii), Point Mogu (California), Prospect Harbur (Maine) and Rosemount (Minnesota). Point Mogu is also center of the calculation center. Every time that every satellite in its orbital motion flies over the territory American the tracciamento stations of it records the Doppler data that they come starts you on the calculation center and here values you for the determination of the orbital parameters. In order to resolve this problem it has been necessary to come in possession of a faithful mathematical model of the land gravitational field. The construction of this model has been one of the problems more arduous solution in the development of the Transit plan from which it is derived puts into effect it them Navstar. It turns out you of this surveying on the land gravitational field, that they are of immense capacity from the geodetic point of view, can be reassumed in an image of the globe in which they come brought back the lines of equal scostamento of Geoide (LMM) fromthe ellissoide of reference APL.