聚束式合成孔径雷达回波数据分块模拟方法

本文提出了一种将聚束模式合成孔径雷达(SAR)回波数据在方位向分成若干子数据,然后将子数据采用条带模式SAR回波模拟算法生成的方法.该方法得到的每个子回波数据的方位向带宽小于条带模式SAR的方位向采样频率,利用它们多普勒频率之间的关系在频域进行插值、移位后可以合成完整的聚束式SAR回波数据;也可以对每个子回波数据使用标准的条带模式聚焦技术进行处理后合成完整的聚束式SAR图像.另外,该方法也说明对聚束式SAR回波数据可以采用方位向分割的方法进行条带式处理,这也可以作为聚束式SAR成像处理器的一个研究方向.仿真结果证明了该方法的有效性.

Raw data simulation of spotlight SAR using azimuth segmentation

A new simulator for spotlight SAR raw data based on azimuth segmentation is proposed,of which the sub data is generated by strip mode SAR simulation algorithm.The azimuth bandwidth of each sub data is smaller than the azimuth sample frequency in strip mode.By making use of the Doppler frequency relationship of two,after operation of interpolating and shifting,the whole spotlight ASR echo signal could be synthesized.The sub data also can be processed by the standard focusing techniques in strip mode respectively and then be synthesized to spotlight SAR image.The SAR image generated by this method has a fine azimuth resolution,and it also has the high precision and efficiency of processing algorithms in strip mode.The proposed method show that the spotlight SAR data can be segmented in azimuth direction and processed by strip mode algorithms,this may be a development of spotlight SAR processor.The experiment results prove the validity of the proposed approach.