ACCURACY ASSESSMENT OF TWO FITTING METHODS FOR GPS PRECISE EPHEMERIS
Feng Wei 1) ;Xue Zhihong 2) ;Shao Jiani 1) ; and Fan Yuebo 3)
1)61081 Troops, Beijing 1000942)Institute of Surveying and Mapping, Information Engineering University，Zhengzhou 4500523)Communications Command Academy，PLA,Wuhan 430010
Abstract：Two polynomial fitting methods:Chebyshev polynomial fitting and Lagrange polynomial fitting, for generating GPS satellite coordinates from precise ephemeris are introduced. The impacts of fitting time span and polynomial order with these two methods to fitting accuracy are discussed. Some useful conclusions are obtained from the tests.
