PERFORMANCE COMPARISON OF GPS BROADCAST EPHEMERIS
PARAMETERS AND THEIR FITTING ALGORITHMS
1）School of Geosciences and Info-Physics，Central South University，Changsha 410083
2）School of Municipal and Surveying Engineering，Hunan City University，Yiyang 413000
3）Xi’an Institute of Surveying and Mapping，Xi’an 710054
4）Changsha Urban Planning & Design Survey Research Institute，Changsha 410007
Abstract：Based on the comparation of two kinds of GPS broadcast ephemeris parameters and their fitting algorithms，the influence of some changed parameters on broadcast ephemeris fitting algorithms is analizesd. The calculated results with the method using the orbit interpolated by GPS precise ephemeris indicate that the method is feasible.
