DocumentCode :
1994054
Title :
Precise SAR satellite orbit parameters determination based on Ground Control Points
Author :
Pan, Bin ; Liu, Ling
Author_Institution :
Sch. of Remote Sensing Inf. Eng., Wuhan Univ., Wuhan, China
fYear :
2010
fDate :
18-20 June 2010
Firstpage :
1
Lastpage :
5
Abstract :
Aim to solve the georeferencing problem of spaceborne SAR imagery, accounting for the orbit physics model and the impact of the earth perturbations, some description models such as four parameters model and polynomial model could be applied to determine the satellite orbit parameters. However the orbit state vectors solved by 5 satellite state vectors supplied by header file in SAR data files could hardly acquire precise orbit parameters, which would greatly effect on the accuracy of co-registration, phase unwrapping, baseline estimation and the generation of Interferogram and DEM (Digital Elevation Model). In this paper, combined with R-D (Range-Doppler) conformation equation and earth ellipsoid equation, which explicitly describe the relationship of corresponding pixel between the 2D image coordinate and the 3D cartographic coordinate of ground targets, an advanced orbit model algorithm by adding few GCPs (Ground Control Points) to improve satellite state vectors is presented. All the correlative formulas are deduced and the orbit parameters can then be iteratively determined through solving a linear equation set consisting of the error equations from all GCPs under Recursive Least Square (RLS) algorithm. The algorithm is tested on an ERS SCL (Single Complex Looked) scene with a series of simulation experiments and the improved orbit parameters and contrasted with accurate SAR orbit data supplied by DEOS institution of Delft University in Holland, which could be demonstrated of validity and stability.
Keywords :
artificial satellites; celestial mechanics; synthetic aperture radar; 3D cartographic coordinate; Digital Elevation Model; Ground Control Points; Range-Doppler conformation equation; Recursive Least Square algorithm; SAR data files; SAR orbit data; SAR satellite orbit parameter determination; Single Complex Looked scene; baseline estimation; earth perturbations; error equations; four parameter model; georeferencing problem; ground control points; linear equation; orbit physics model; orbit state vectors; phase unwrapping; polynomial model; satellite state vectors; space-borne SAR imagery; synthetic aperture radar; Accuracy; Data models; Mathematical model; Orbits; Polynomials; Satellites; conformation equation; satellite orbit parameters; synthetic aperture radar (SAR);
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Geoinformatics, 2010 18th International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-7301-4
Type :
conf
DOI :
10.1109/GEOINFORMATICS.2010.5567618
Filename :
5567618
Link To Document :
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