Study on validation method of visible imagery spatial resolution of imager on geostationary platform  

作　　者：郭强 

机构地区：[1]Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites China Meteorological Administration

出　　处：《Chinese Optics Letters》2006年第7期389-392,共4页中国光学快报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China under Grant No. 40401040.

摘　　要：Based on the analysis for the main elements of the total modulation transfer function （MTF） of imager on geostationary platform, the precise evaluation for its low spatial frequency spectrum has been achieved. Meanwhile, it is pointed out that the main cause of imagery spatial resolution lower than the designed value is the ＂slight defocus＂ of imager focal plane array （FPA）. The validation method for visible imagery spatial resolution is proposed based on the analysis of defocused optical system model and edge-spread-function （ESF）, the relative error is less than 7% after alleviating stray light effects. This method has been applied in the in-orbit ground testing of FY-2C geostationary meteorological satellite successfully.Based on the analysis for the main elements of the total modulation transfer function （MTF） of imager on geostationary platform, the precise evaluation for its low spatial frequency spectrum has been achieved. Meanwhile, it is pointed out that the main cause of imagery spatial resolution lower than the designed value is the ＂slight defocus＂ of imager focal plane array （FPA）. The validation method for visible imagery spatial resolution is proposed based on the analysis of defocused optical system model and edge-spread-function （ESF）, the relative error is less than 7% after alleviating stray light effects. This method has been applied in the in-orbit ground testing of FY-2C geostationary meteorological satellite successfully.

关 键 词：MODULATION Optical systems Optical transfer function Stray light Weather satellites 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]