Correction method of zero path difference position
Received:September 09, 2017  Revised:October 20, 2017  download
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Author NameAffiliationE-mail
FENG Xuan National Satellite Meteorological Center fengxuan@cma.gov.cn 
GUO Qiang National Satellite Meteorological Center guoqiang@cma.gov.cn 
HAN Chang-Pei Shanghai Institute of Technical Physics,Chinese Academy of Sciences  
ZOU Yao-Pu Shanghai Institute of Technical Physics,Chinese Academy of Sciences  
Abstract:The Geostationary Interferometric Infrared Sounder (GIIRS) on board FY-4A is a Michelson interferometer infrared sounder. The interferogram is sampled at discrete points. The zero path difference (ZPD), which is the peak of the interferogram, is not sampled. This effectively shifts the interferogram and adds a linear phase to the spectrum. A linear regression on the residual phase of the calibrated spectrum will reveal the shift. This method has been used in the interferogram signal processing of the GIIRS, and has abstained the better results.
keywords:FY-4A,GIIRS,interferogram,ZPD
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Copyright:《Journal of Infrared And Millimeter Waves》