<h2>AAS 97-107</h2>
<h2>GPS NAVIGATION INITIATIVES AT GODDARD SPACE FLIGHT CENTER FLIGHT DYNAMICS DIVISION                                                               </h2>
<h4>  R. Hart and S. Truong, NASA Goddard Space Flight Center; A. Long, D. Oza and T. Lee, Computer Sciences Corporation                                                      </h4>
<h2> Abstract </h2>
 The Goddard Space Flight Center (GSFC) Flight Dynamics Division (FDD) is pursuing  the application of GPS technology to improve the accuracy and economy of spacecraft  navigation.  Thee FDD's current GPS navigation initiatives include (1) the GPS  Enhanced orbit Determination Experiment (GEODE) for high accuracy autonomous  navigation and (2) modular GPS navigation software engineering for space and ground  applications.  This paper discusses each of theses initiatives.