SAR IMAGE ENHANCEMENT BASED ON BEAM SHARPENING TECHNIQUE  

基于波束锐化技术的SAR图像增强方法(英文)

作　　者：LIYong ZI-IANGKun-hui ZHUDai-yin ZHUZhao-da 

机构地区：[1]CollegeofInformationScienceandTechnology,NUAA29YudaoStreet.Nanjing.210016.P.R.China [2]DepartmentofElectronicEngineering.BeijingUniversityofAeronauticsandAstronautics,Beijing,100083,P.R.China

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2004年第2期147-151,共5页南京航空航天大学学报（英文版）

摘　　要：A major problem encountered in enhancing SAR image is the total loss of phase information and the unknown parameters of imaging system. The beam sharpening technique, combined with synthetic aperture radiation pattern estimation provides an approach to process this kind of data to achieve higher apparent resolution. Based on the criterion of minimizing the expected quadratic estimation error, an optimum FIR filter with a symmetrical structure is designed whose coefficients depend on the azimuth response of local isolated prominent points because this response can be approximately regarded as the synthetic aperture radiation pattern of the imaging system. The point target simulation shows that the angular resolution is improved by a ratio of almost two to one. The processing results of a live SAR image demonstrate the validity of the method.A major problem encountered in enhancing SAR image is the total loss of phase information and the unknown parameters of imaging system. The beam sharpening technique, combined with synthetic aperture radiation pattern estimation provides an approach to process this kind of data to achieve higher apparent resolution. Based on the criterion of minimizing the expected quadratic estimation error, an optimum FIR filter with a symmetrical structure is designed whose coefficients depend on the azimuth response of local isolated prominent points because this response can be approximately regarded as the synthetic aperture radiation pattern of the imaging system. The point target simulation shows that the angular resolution is improved by a ratio of almost two to one. The processing results of a live SAR image demonstrate the validity of the method.

关 键 词：synthetic aperture radar (SAR) image enhancement beam sharpening 

分 类 号：TN957.52[电子电信—信号与信息处理] TN958[电子电信—信息与通信工程]