Statistics – Computation
Scientific paper
Jan 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008acasn..49...67z&link_type=abstract
Acta Astronomica Sinica, vol. 49, no.1 , p.67-80
Statistics
Computation
Celestial Mechanics: Determination Of Orbit, Methods: Numerical
Scientific paper
Aiming at combined orbit determination (COD) multi-source data fusion for low earth orbit (LEO) based on bi-satellite positioning system (BPS), an improved variance component estimation (VCE) optimal weighting method of homogeneous data is established with two-step system errors correction. And then an integrated optimal weighting method based on model structure characteristics analysis and VCE estimation of heterogeneous data is put forward by analyzing the essence of multi-source fusion measure model which is a multi-structural, multi-parametric, non-linear regression model. Then the algorithm of optimal weighting and COD parameters estimation is designed, and two kinds of COD simulation experiments are carried out by processing homogeneous data of bi-satellite range sum and its back-up satellite data, heterogeneous data of bi-satellite range sum data and star sensor angle data. Theoretical analysis and simulation computations show that improved VCE method based on two-step system errors correction can gain higher precision than that of traditional experience weighting method for COD of homogeneous data weighting. At the same time, by introducing weighting factor which denotes model structure characteristics and proves the designed optimal weighting algorithm, the amelioration of COD precision of LEO and bi-satellite gain to some extent is feasible from practical application.
Pan Xiao-Gang
Wang Jia-Qi
Wang Zhao-Ming
Zhao Y. D.
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