电子学报 ›› 2012, Vol. 40 ›› Issue (9): 1809-1816.DOI: 10.3969/j.issn.0372-2112.2012.09.017

• 学术论文 • 上一篇    下一篇

基于随机共振理论的双基ISAR弱信号提取及成像分析

邓冬虎1, 朱小鹏1, 张群1,2, 罗迎1, 李宏伟1   

  1. 1. 空军工程大学信息与导航学院, 陕西西安 710077;
    2. 复旦大学波散射与遥感信息重点实验室, 上海 200433
  • 收稿日期:2011-04-19 修回日期:2012-04-16 出版日期:2012-09-25 发布日期:2012-09-25
  • 作者简介:邓冬虎 男,1986年12月出生于河南洛阳,博士生.2009年12月在空军工程大学电讯工程学院获得硕士学位,研究方向为雷达信号处理. E-mail:dengdonghu@163.com

Weak Signals Extraction and Imaging Analysis in Bistatic ISAR Systems Based on Stochastic Resonance

DENG Dong-hu1, ZHU Xiao-peng1, ZHANG Qun1,2, LUO Ying1, LI Hong-wei1   

  1. 1. Institute of Information & Navigation, AFEU, Xi'an, Shaanxi 710077, China;
    2. Key Laboratory of Wave Scattering and Remote Sensing Information, Fudan University, Shanghai 200433, China
  • Received:2011-04-19 Revised:2012-04-16 Online:2012-09-25 Published:2012-09-25

摘要: 在双基地逆合成孔径雷达成像系统中,针对强背景噪声中的目标弱散射点探测和识别问题,基于能捕获目标强散射点的假设前提,提出了应用随机共振理论的弱散射点检测方法.首先对作解线调后的回波信号进行快时间轴变换处理,并对处理后的信号进行二次采样使其满足绝热近似条件;然后应用随机共振技术检测出代表瞬时距离差的弱周期信号频率,并通过循环检测和正负频率判断等后续处理提高系统的检测信噪比以及确定弱散射点的正确位置.最后对随机共振性能和双基ISAR成像进行了仿真.结果表明:随机共振能大幅提高弱周期信号的输出信噪比,应用在双基ISAR系统中能有效提高系统的信噪比增益和扩大雷达接收机的动态范围.

关键词: 逆合成孔径雷达(ISAR), 双基地雷达(Bistatic Radar), 随机共振(SR), 二次采样

Abstract: In the bistatic ISAR systems,in order to solve the problems of weak scatters detection and identification in strong noise background,the stochastic resonance(SR) was applied to extract the information of weak scatters.On the assumption that the strong scatters could be detected,the signals after de-chirp were disposed through transformation in fast time axis firstly,which made the signals satisfy the condition of adiabatic approximation;then the SR was used to detect the signal frequency that expressed the instantaneous range difference;after that,some processing were implemented to confirm the right positions of weak scatters and to improve the output signal-noise-ratio(SNR).Numerical simulations shows that the SR can improve the SNR largely and enlarge the dynamic bound of radar receiver.

Key words: inverse synthetic aperture radar, bistatic radar, stochastic resonance(SR), second sampling

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