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《Acta Geodaetica et Cartographica Sinica》 2008-01
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Correction of Earth Model in Range-Doppler Location Algorithm

FU Wen-xue , GUO Xiao-fang, TIAN Qing-jiu International Institute for Earth System Science, Nanjing University, Nanjing 210093, China; China Aero Geophysical Survey & Remote Sensing Center for Land and Resources, Beijing 100083, China  
The Range-Doppler location algorithm of SAR is used wildly in geometric rectification, point location and imaging simulation. Its merit is to do location without the known points. However its precision is influenced by the height of target, so the earth model in this algorithm should be corrected. In previous research, the earth was regarded as sphere, and the height of point was added to the equator directly. But this correction can' t remove the effect of height completely and will cause error. In this paper, the formula of reducing the geodetic height of point to the e-quator is derived and the more reasonable model is introduced. Finally, from example and the simulation of ENVI-SAT imaging, the error of using the previous correction in different latitude and height area was analyzed. The result indicates that the error will be remarkable and the correct correction method should be used.
【Fund】: 地质调查局项目(1212010560705)
【CateGory Index】: TP79
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