摘要
FMCWSAR将调频连续波与合成孔径成像技术结合于一体，是一种新近被提出来的成像雷达体制，它以其体积小、重量轻、成本低、分辨率高等一系列优点，引起越来越多的关注。然而，在FMCWSAR系统中，雷达连续不断地发射信号，调制信号周期相对较长，停一走（STOP AND GO）近似不再成立，所以要用合适的算法来实现成像。针对FMCW SAR的特点，详细推导了停一走近似失效时FMCW SAR的信号模型及处理过程，提出了一种改进的RD算法。此方法是通过补偿连续运动引入的多普勒频移，消除连续运动的影响。
Frequency modulated continuous wave （FMCW） synthetic aperture radar （SAR） combining FMCW technique with synthetic aperture imaging methods is a newly proposed imaging radar system. It has the advantages such as small cubage, light weight, cost-effective, high-resolution, etc. So there is a growing interest in the frequency modulated FMCW SAR. However, for FMCW SAR, the platform continuously moves while transmitting and receiving signal. The duration of the transmitted pulse increases, the stop-and-go approximation is invalid. So the proper algorithms have to be used to achieve the expected results. For the peculiarity of FMCW SAR, the signal processing was deduced in detail when STOP AND GO approximation was invalid, and a modification to RD was proposed. A penalty function was used in order to compensate Doppler frequency shift.
出处
《海军航空工程学院学报》
2008年第5期493-496,共4页
Journal of Naval Aeronautical and Astronautical University
基金
中国博士后科学基金(2005037772)
关键词
合成孔径雷达
调频连续波
停走近似
成像
synthetic aperture radar （SAR）
frequency modulated continuous wave （FMCW）
stop-and-goapproximation
imaging
