相干场成像全相位目标直接重构法  

All-phase target reconstruction method for coherent field imaging

作　　者：曹蓓[1] 罗秀娟[1] 陈明徕 张羽[1] 

机构地区：[1]中国科学院西安光学精密机械研究所,西安710119

出　　处：《物理学报》2015年第12期197-205,共9页Acta Physica Sinica

基　　金：中国科学院"西部之光"人才培养计划"西部博士资助项目"(批准号:Y429621213)资助的课题~~

摘　　要：回波信号处理和目标重构算法是相干场成像中的核心数据处理技术,直接影响系统的成像质量.基于全相位谱分析理论,提出一种新的系统融合处理算法,对接收端回波信号直接提取全相位谱相位及幅值信息实现目标图像重构,能够有效抑制各种因素带来的频率误差.经室外实验系统验证,成像能力大大优于传统重构算法,重构目标分辨率接近理论极限值.Received signal processing and target reconstruction technique plays a key role in coherent field imaging, and directly influences the quality of the reconstructed image of a target. Based on all-phase fast Fourier transformation （FFT）spectrum analysis theory, a new processing and reconstruction method is proposed. By directly extracting the phase and amplitude information from all-phase FFT spectrum of the return signal, the proposed all-phase target reconstruction method is capable of inhibiting the frequency error caused by many factors, thus reconstructing the target image more precisely. The validity of the proposed method is proved by a coherent field imaging system in outdoor environments, and it has a better reconstruction performance than a traditional method. The resolution of the reconstructed target is close to a theoretical diffraction limit.

关 键 词：相干场成像 目标重构 全相位 频谱校正 

分 类 号：TN911.7[电子电信—通信与信息系统]