FMCWSAR方位匹配滤波函数研究

Research on Azimuth Matching Filtering Function for FMCW SAR

FMCW SAR是一种新近被提出来的成像雷达体制,它具有体积小、重量轻、成本低、分辨率高等一系列优点。因此,人们对FMCW SAR越来越关注。首先推导了FMCW SAR的信号模型,然后讨论了方位匹配滤波函数。为了能够精确成像,同时避免计算量过大,提出将场景沿距离向分段,用不同的方位匹配滤波函数进行处理,并给出了分段标准。最后,仿真结果表明此方法可以得到理想的成像结果。

Frequency modulated continuous wave synthetic aperture radar （FMCW SAR） is a newly proposed imaging radar system with the advantages of small cubage, light weight, cost-effective, high-resolu- tion, etc. So, there is a growing interest in the frequency modulated FMCW SAR. The signal model of FMCW SAR is deduced in detail. Then the azimuth matching filtering function is discussed. In order to form the accurate image as well as avoid the large calculation capacity, the method is presented which di- vides the scene into segments and uses the different azimuth matching filtering function to match and the criterion is given which is used to divide the scene into segments. At last, the simulation proves the algorithm is feasible.