黄磊,,
周汉飞,
张亮,
李强,
黄敏
深圳大学信息工程学院 ??深圳 ??518060
基金项目:国家自然科学基金(U1713217,61501485,61501300,61601300,61601304),中国博士后科学基金(2015M582413,2017M610547),广东省自然科学基金(2015A030311030),深圳市基础研究项目(ZDSYS201507081625213,JCYJ20160520165659418,JCYJ20170302142545828,JCYJ20150324140036835),深圳大学科研启动项目(201557,2016057)
详细信息
作者简介:赵博:赵 博(1986–),男,河南南阳人,博士,博士后。2015年在西安电子科技大学获得博士学位,现在深圳大学从事博士后研究工作。主要研究方向为雷达信号处理与电子对抗。E-mail: b_zhao@126.com
黄磊:黄 磊(1975–),男,广东湛江人,博士,****。主要研究方向为阵列信号处理、雷达信号处理
周汉飞(1981–),男,博士,博士后。主要研究方向为雷达信号处理
通讯作者:黄磊 dr.lei.huang@ieee.org
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出版历程
收稿日期:2018-04-28
修回日期:2018-06-25
1-bit SAR Imaging Method Based on Single-frequency Time-varying Threshold
Zhao Bo,Huang Lei,,
Zhou Hanfei,
Zhang Liang,
Li Qiang,
Huang Min
College of Information Engineering, Shenzhen University, Shenzhen 518060, China
Funds:The National Natural Science Foundation of China (U1713217, 61501485, 61501300, 61601300, 61601304), The China Postdoctoral Science Foundation (2015M582413, 2017M610547), The Natural Science foundation of Guangdong Province, China (2015A030311030), The Foundation of Shenzhen City (ZDSYS201507081625213, JCYJ20160520165659418, JCYJ20170302142545828, JCYJ20150324140036835), The Shenzhen University (201557, 2016057)
摘要
摘要:该文提出一种基于单频时变阈值的1-bit合成孔径雷达(SAR)成像方法,通过将回波数据与时变阈值比较,将其量化为1-bit采样数据,从而降低SAR回波数据的位宽,达到简化系统、提升效率的目的。传统的1-bit采样将信号与0阈值比较,这将造成信号相对幅度的非线性失真,影响成像质量。而随机时变阈值虽然能够保留幅度信息,却会引入额外的类噪声干扰。单频时变阈值将能够有效地保留1-bit采样量化中丢失的相对幅度信息,同时避免引入类噪声干扰,有效地提高了1-bit采样量化下的SAR成像质量。通过仿真实验定量分析了算法的成像聚焦质量、幅度信息保持能力,并通过对场景目标的成像验证了算法的有效性。
关键词:合成孔径雷达/
1-bit采样/
时变阈值
Abstract:This paper proposes a 1-bit Synthetic Aperture Radar (SAR) imaging method based on a single-frequency time-varying threshold. Synthetic aperture radar echoes are quantized to 1-bit sampling data by comparing the data with the threshold; this reduces the data-width of the SAR echoes, consequently simplifying the system and improving efficiency. The conventional 1-bit sampling compares the signal to a zero threshold, bringing nonlinear distortion to the relative amplitude and degrading the imaging quality. The random threshold can keep the amplitude information, but it introduces additional noise-like interferences. In contrary, the single-frequency time-varying threshold can maintain the amplitude information lost during the 1-bit sampling and quantization, and at the same time, eliminate noise-like interferences; thus, the imaging quality of SAR using 1-bit sampling and quantization can be improved. The focusing quality and the amplitude-maintaining ability of the proposed approach is quantitatively analyzed, and the effectiveness of the approach is verified by an imaging experiment on a scene.
Key words:Synthetic Aperture Radar (SAR)/
1-bit sampling/
Time-varying threshold
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