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《Journal of Remote Sensing》 2008-02
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Research on Precise Geolocation Model and Method Using Satellite Remote Sensing

YANG Zhong-dong,GUAN Min(National Satellite Meteorological Center,Beijing 100081,China)  
In the program of geolocation with environmental meteorological satellite,the earth location software makes use of earth ellipsoid and terrain surface data in conjunction with satellite orbit parameter and geometry attitude,and information of the sensor and satellite geometry to compute data including geodetic longitude and latitude coordinates,height,ground to satellite direction vector and range,and solar vector.The satellite orbit propagation model and the mathematical procedure which intersects the sensor's line of sight with the terrain surface of the Earth are most important in the program.In order to meet the requirement of high precision geolocation for environmental satellite remote sensing data,we have developed a new generation orbital motion forecast and remote sensing geolocation software system.This system is based on the variable order,and stepsize orbital motion numerical integration model(DE/DEABM),and is different from conventional Brouwer perturbation analytical model.During the research of this system,we have studied variety of perturbations that affect orbital motion.These perturbations are pronounced for satellite at low altitudes.We use high order precise EGM-96(Earth gravity model) data to improve computing precision of perturbation for asphericity of the Earth.What we put into consideration also includes the perturbation that arises from the gravitational attraction of the Sun and the Moon,solar radiation pressure and atmospheric drag in our works.As case studies,we develop Earth location algorithms and software for two sensors,one is FY-1D VIRR launched on May 2002,and the other is FY-3A MERSI which will be launched in early 2008.In the progress,we analyse details of the optics geometry coordinates relationship of detector,focal plane,main optics system and scan mirror,which are key parts of sensors.As a result,the precision of coordinates transformation model have been developed in this software.After several days of data computing of orbital motion and Earth location test for FY-1D VIRR,we find that the precision of the new software system reaches the range from centimeters to meters.It is a great improvement compared with the 1km precision of old perturbation analytical method.Overall,it is found that the software system of FY-1D VIRR can provide navigation accuracies of within 1 km at nadir.
【Fund】: 国家高技术研究发展计划(863计划)支持课题(编号:2001AA135060 2003AA133050)
【CateGory Index】: TP79
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