黄丽佳1,2,,,
俞雷4,
①.中国科学院电子学研究所 ??北京 ??100190
②.中国科学院空间信息处理与应用系统技术重点实验室 ??北京 ??100190
③.中国科学院大学电子电气与工程学院 ??北京 ??100049
④.北京航空航天大学电子信息工程学院 ??北京 ??100191
基金项目:国家自然科学基金(61331017)
详细信息
作者简介:陈世阳(1994–)，男，硕士研究生，研究方向为合成孔径雷达信号处理。Email: m15528309300@163.com
黄丽佳(1984–)，女，博士，副研究员，硕士生导师，研究方向为合成孔径雷达信号处理与图像分析。Email: iecas8huanglijia@163.com
俞雷：俞 ? 雷(1979–)，男，博士生，高级工程师。研究方向为合成孔径雷达系统、雷达信号处理和遥感应用处理。E-mail: ylanlei@buaa.edu.cn
通讯作者:黄丽佳 ? iecas8huanglijia@163.com
中图分类号:TN958计量
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被引次数:0
出版历程
收稿日期:2018-11-14
修回日期:2019-02-22
A Novel sinc Interpolation for Continuous PRF Sampled Sequences Reconstruction in Spotlight SAR
CHEN Shiyang1,2,3,4,,HUANG Lijia1,2,,,
YU Lei4,
①. Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China
②. Key Laboratory of Technology in Geo-Spatial Information Processing and Application System, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China
③. School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
④. School of Electronics and Information Engineering, Beihang University, Beijing 100191, China
Funds:The National Science Foundation of China (61331017)
More Information
Corresponding author:HUANG Lijia, iecas8huanglijia@163.com
摘要
摘要:该文针对周期性变PRF采样高分辨率聚束模式合成孔径雷达(SAR)提出了一种改进的两步成像算法。变脉冲重复频率(PRF)设计可解决固定盲区等问题，是解决星载SAR高分宽幅矛盾的一种有效手段，但变PRF采样会引起频谱混叠和虚假目标等问题。该文从离散非均匀傅里叶变换原理出发，推导改进sinc插值核函数并建立了时域-时域的回波重建方法，将变PRF采样回波重构为均匀采样回波。此外将改进sinc插值与两步式成像算法结合，据此发展出针对非均匀采样回波的改进两步式聚束SAR成像算法，拓展了传统两步式成像算法的使用范围。仿真数据和实际数据处理结果验证了成像算法的有效性和精确性，并且改进sinc插值具备更高的计算效率。
关键词:聚束SAR/
改进sinc插值/
变PRF采样/
高分辨率/
宽测绘带
Abstract:This paper focuses on an improved imaging-algorithm for the spotlight Synthetic Aperture Radar (spotlight SAR) with continuous Pulse Repetition Frequency (PRF) variation in extremely high-resolution imaging-process. PRI variation is conventionally employed to resolve the problem of fixed blind ranges as well as the conflict of high-resolution and wide-swath; however, there are problems such as spectrum aliasing and ambiguous targets caused by nonuniform sampling. In this study, a novel sinc interpolation method is proposed to reconstruct a uniformly sampled signal from non-uniform Fourier Transform samples. Then a two-step processing approach combined with the novel sinc interpolation method is presented in the process of non-uniformly sampled echo imaging. The simulation proves the validity and accuracy of the proposed imaging algorithm. In addition, the computational cost of the novel sinc interpolation is further reduced compared to that of non-uniform Fourier transformation.
Key words:Spotlight SAR/
Modified sinc-interpolation/
PRF Variation/
High resolution/
Wide swath
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