基于多普勒分辨的连续波合成孔径雷达成像方法

发布时间：2018-01-05 02:11

本文关键词：基于多普勒分辨的连续波合成孔径雷达成像方法　出处：《系统工程与电子技术》2014年06期 　论文类型：期刊论文

【摘要】：提出一种新的连续波(continuous waveform,CW)体制合成孔径雷达(synthetic aperture radar,SAR)成像方法。有别于脉冲波形SAR和调频连续波SAR通过发射宽带信号获得高距离分辨率,CW-SAR成像利用CW波形的高多普勒分辨率进行成像,通过将回波信号与尺度变换后的发射信号进行相关构造成像数据模型,该相关信号实际为场景散射系数在等多普勒线上的投影,基于该相关信号,采用滤波反投影图像重建算法进行场景反射率重建。该CW-SAR成像方法不仅适用于宽带和窄带CW发射波形,而且也适用于单/双基SAR和任意载机飞行轨迹。以双基情形为例,分析成像方法的性能,并进行仿真验证。
[Abstract]:A new continuous wave waveform (CW) system for synthetic aperture radar is proposed. Different from pulse waveform SAR and FM continuous wave SAR, high range resolution can be obtained by transmitting wideband signals. The CW-SAR imaging uses the high Doppler resolution of the CW waveform to image, and constructs the imaging data model by correlating the echo signal with the scale transformed emission signal. The correlation signal is the projection of the scene scattering coefficient on the equal Doppler line, based on the correlation signal. The filtered backprojection image reconstruction algorithm is used to reconstruct the scene reflectivity. This CW-SAR imaging method is not only suitable for wideband and narrowband CW emission waveforms. It is also suitable for single / bistatic SAR and arbitrary flight trajectory. The performance of the imaging method is analyzed and verified by simulation in a bistatic case.
【作者单位】：南京航空航天大学电子信息工程学院雷达成像与微波光子技术教育部重点实验室;上海微小卫星工程中心;
【基金】：航空科学基金(20132052035) 江苏高校优势学科建设工程南京航空航天大学科研基地创新基金(NJ20140008)资助课题
【分类号】：TN957.52
【正文快照】： 0引言合成孔径雷达(synthetic aperture radar,SAR)成像因具有分辨率高、抗干扰能力好、可全天候全天时工作等良好性能,一直是民用遥感和军事侦察技术领域的研究重点。现有的SAR系统通常发射宽带脉冲波形(pulsed waveform,PW),如线性调频(linear frequency modulated,LFM)脉冲

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