<h2>AAS 97-109</h2>
<h2>G THE GPS NAVIGATION SOLUTION FOR ORBIT DETERMINATION                                                                                            </h2>
<h4> J. M. Nascimento, H. K. Kuga and A. F. B. A. Prado, INPE-Instituto Nacional de Espaciais, Brazil                                                                         </h4>
<h2> Abstract </h2>
 The goal of this paper is to show the problem of the orbit determination of an  artificial satellite, situated in an orbit of approximately 1,000 Km height, which   has a receiver able to receive signals transmitted by a constellation of satellites  placed at an altitude of approximately 20,000 Km.  The constellation is made up of satellites which composes the "Global Positioning System" (GPS).