单频信号二维合成孔径成像算法  

Single frequency two-dimensional synthetic aperture imaging system and imaging algorithm

作　　者：张寅生[1] 杨俊刚[2] 安玮[2] 刘昆[1] 

机构地区：[1]国防科技大学航天科学与工程学院,湖南长沙410073 [2]国防科技大学电子科学与工程学院,湖南长沙410073

出　　处：《国防科技大学学报》2014年第4期97-101,共5页Journal of National University of Defense Technology

基　　金：国家自然科学基金资助项目(60903206);国家部委资助项目

摘　　要：传统合成孔径雷达采用大带宽信号实现距离向分辨,采用一维合成孔径实现方位分辨,得到二维图像。在某些近场成像场合,成像分辨率要求很高,依靠信号带宽很难达到要求。提出了一种二维合成孔径成像系统,利用二维合成孔径实现二维分辨,分辨率取决于合成孔径长度,不受信号带宽的约束,可以实现超高分辨率。信号采用简单的单频信号,可使系统大大简化。详细推导了单频信号的二维合成孔径成像算法。仿真结果表明,单频信号二维合成孔径是一种有效的高分辨率成像技术。Traditional synthetic aperture radar uses wideband signal to achieve range resolution, and uses one-dimensional synthetic aperture to achieve azimuth resolution, thereby forming a two-dimensional image. In the cases of short range imaging, a very high imaging resolution may be required, and it is difficult to achieve such high resolution using signal bandwidth. A two-dimensional synthetic aperture imaging system is proposed ; it uses the two-dimensional synthetic aperture to achieve two-dimensional resolution. The resolution depends on the length of the synthetic aperture, and it is no longer limited by the signal bandwidth and can obtain ultra-high resolution. The transmitted signal is single frequency waveform, thus the system can be very simple. The imaging algorithm for the single frequency two-dimensional synthetic aperture imaging system was derived in detail. Simulation results showed that the single frequency two-dimensional synthetic aperture imaging system is an effective technique for high resolution imaging.

关 键 词：雷达成像 近场成像 二维合成孔径 成像算法 

分 类 号：TN958[电子电信—信号与信息处理]