Research On The Perturbation Forces Model And Interpolation Method In The Navigation Satellite Autonomous Orbit Determination

Along with the development of the technology for spacecraft autonomous navigation^the autonomous orbit determination technology is becoming an important technology in the society Some developed counties have got some progress in the satellite autonomous orbit determination research.Compared with then^Onr country is backward. This paper builds the perturbation forces model^based on tlie star calendar information provided by the observatory foundation on the round After selecting numerical metliod,got the satellite orbit in a period of time. And through some filtering processing,fixed the orbit parameters, got the improved integral rail at lastUsing the satellite radio star calendai;through the analysis of perturbation forces, established a simulation software for the satellite autonomous orbit determination.Used it to analysis star location accuracy of the influence by location method and star calendar error. This is the main research contents in this paper. The third body of perturbation forces model related to DE405star calendar information provided by the JPL to calculate the moon’s and the sun’s position.This would use the interpolation method.This would also involve chebyshev polynomial fitting.The initial value point got from the radio star calendar with the dynamic model,both of them consist of the observed equation.Calculated certain integral interval of tlie orbit points within24horns by Runge-Kutta integrator.After getting the preliminary satellite orbit,through a series of filtering processing,got the optimized satellite orbit.Compared the optimized satellite orbit with tlie precision star calendar provided by the ground stations3the accuracy can keep in10meters within24horns.Through comparing the integral orbit with the precision star calendar,we can get the orbit precision Because the precision star calendar gave only15minutes interval of the calendar information Therefore here needs to use interpolation method. In addition,when got the position as well as speed information of sun and moon in the third body,we also have to use interpolation operation So I did detailed analysis and comparison to the interpolation method in this paper. Finally chose Lagrange interpolation method, and its best order number to use in the scheme.