DISCUSSION ON ORBIT FITTING AND ORBIT FORECASTING OF LOW EARTH ORBIT SATELLITES
Zhang Ruwei 1,2) ; and Liu Genyou 1)
1)Institute of Geodesy and Geophysics,CAS,Wuhan 4300772)School of Graduate,CAS,Beijing 100049
Abstract The orbit fitting and forecasting of CHAMP satellite as an LEO example is discussed. The influence on fitting accuracy in the selection of different fitting time length and different polynomial order by use of Chebyshev polynomial is analyzed，and the feasibility of orbit forecasting in a short time is discussed as well.The fitting results with Chebyshev polynomial, Lagrange polynomial and normal polynomial are compared with each other,it indicates that Chebyshev polynomial is superior to both the others.In addition,the accuracy of forecasting orbit by using Chebyshev polynomial based on the mlevel orbit of single point orbiting, and numerical stability of the method is verified. it is proved that the Chebyshev polynomial can be used for realtime forecasting LEO orbit in a short time.
Key words ：
Chebyshev polynomial
Lagrange polynomial
LEO
realtime orbiting
orbit fitting
orbit forecasting
Received: 01 January 1900
Corresponding Authors:
Zhang Ruwei
Cite this article:
Zhang Ruwei,and Liu Genyou . DISCUSSION ON ORBIT FITTING AND ORBIT FORECASTING OF LOW EARTH ORBIT SATELLITES[J]. , 2008, 28(4): 115-120.
Zhang Ruwei,and Liu Genyou . DISCUSSION ON ORBIT FITTING AND ORBIT FORECASTING OF LOW EARTH ORBIT SATELLITES[J]. jgg, 2008, 28(4): 115-120.
URL:
http://www.jgg09.com/EN/ OR http://www.jgg09.com/EN/Y2008/V28/I4/115
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