摘要
环扫SAR具有探测范围广、实时性强、重访率高等优点,能够快速对大面积环状区域进行成像.针对环扫SAR的工作特点,本文提出了一种基于多普勒波束锐化(DopplerBeamSharpening,DBS)的环扫SAR成像方法.该算法较好地克服了DBS算法在时间相干性上的限制,适应环扫SAR方位角时刻改变、360°成像和大斜视成像的特点,能够很好地应用于环扫SAR快速成像.本文给出了该方法的流程图和成像推导过程,并通过点目标仿真验证了本文方法的有效性.
A circular scanning SAR has the advantages of wide detection range, high real-time performance and high re-visit rate. Therefore, it is able to achieve quick imaging of a large circular area. Aiming at the characteristics of circular scanning SAR, a new imaging method based on Doppler Beam Sharpening (DBS) for circular scanning SAR is proposed in this paper. This algorithm overcomes the time coherence limitation of DBS algorithm, and it is adopted to the unique characteristics of circular scanning SAR, such as the time-varying azimuth angle, 360 degrees and large squint imaging. It can be well applied to the rapid imaging of circular scanning SAR. A flow chart of the proposed method and the derivation of the imaging method are given in this paper. Moreover, the effectiveness of the proposed method is validated by point target simulation.
作者
姚晓楠
种劲松
YAO Xiaonan;CHONG Jinsong(Institute of Electronics,Chinese Academy of Sciences,Beijing 100190,China;National Key Lab of Microwave Imaging Technology,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《测试技术学报》
2019年第4期307-312,共6页
Journal of Test and Measurement Technology
