<h2>AAS 97-108</h2>
<h2>ORBEST-A GPS NAVIGATION SOLUTION ALGORITHM WITHOUT DOP    ANALYSIS                                                                               </h2>
<h4> R. V. F. Lopes and H. K. Kuga, INPE-Instituto Nacional de Pesquisas Espaciais, Brazil                                                                                    </h4>
<h2> Abstract </h2>
 In previous works the authors presented a static least squares procedure for orbit  determination from a redundant set of GPS pseudo-range measurements.  The work was  later extended to estimate the receiver clock bias.  In this paper a complete  derivation of the procedure is presented and a new open form solution for the  algorithm initialization is proposed.  Numerical results from digital simulation as  well as from an experiment on the ground are shown.