北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2014, Vol. 37 ›› Issue (6): 59-62.doi: 10.13190/j.jbupt.2014.06.012

• 论文 • 上一篇    下一篇

旋转线性调频信号的分析与设计

张小乾1, 姚远程1, 王凌2, 秦明伟1   

  1. 1. 西南科技大学 信息工程学院, 四川 绵阳 621010;
    2. 中国工程物理研究院 院机关, 四川 绵阳 621999
  • 收稿日期:2013-07-04 出版日期:2014-12-28 发布日期:2014-10-17
  • 作者简介:张小乾(1987-),男,硕士生,E-mail:zhxq0528@163.com;姚远程(1962-),男,教授,硕士生导师.
  • 基金资助:

    国防科工委民用航天技术研究所项目(B3120133002)

Analysis and Design of RLFM Signal

ZHANG Xiao-qian1, YAO Yuan-cheng1, WANG Ling2, QIN Ming-wei1   

  1. 1. Faculty of Information Engineering, Southwest University of Science and Technology, Mianyang 621010, China;
    2. Administrative agency, China Academy of Engineering Physics, Mianyang 621999, China
  • Received:2013-07-04 Online:2014-12-28 Published:2014-10-17

摘要:

为提高复合线性调频(CLFM)信号的距离速度联合分辨力,提出了一种基于分数阶傅里叶变换的旋转线性调频(RLFM)信号,给出了设计方法,仿真得到了RLFM信号的模糊函数图、-3dB模糊度图、距离模糊函数图及速度模糊函数图,最后将其与CLFM信号进行了对比,结果显示,当旋转角度α满足1/2 α<5/6时,RLFM信号具有更好的速度分辨力和距离速度联合分辨力.

关键词: 旋转线性调频信号, 分数阶傅里叶变换, 模糊函数, 分辨力

Abstract:

In order to improve the joint distance-velocity-resolution of the composed linear frequency modulation (CLFM) signal, a rotated linear frequency modulation (RLFM) signal based on fractional Fourier transform is proposed. The design method of RLFM signal is given, and the simulations of the signal about the ambiguity function, -3dB ambiguity graph, distance ambiguity graph and velocity ambiguity graph have been presented. Finally to put RLFM signal and CLFM signal are compared. The differences of them show that the RLFM signal has a better performance on velocity resolution and joint distance-velocity- resolution than the CLFM signal.

Key words: rotated linear frequency modulation signal, fractional Fourier transform, ambiguity function, resolution

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