| FRFT域LFM信号的调频率分辨率与相位差的关系 |
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| 引用本文： | 冯志成,安建平,卫景宠.FRFT域LFM信号的调频率分辨率与相位差的关系[J].系统工程与电子技术,2011,33(10):2194-2197. |
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| 作者姓名： | 冯志成 安建平 卫景宠 |
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| 作者单位： | 1. 北京理工大学信息与电子学院, 北京 100081;
2. 北方自动控制技术研究所, 山西 太原 030006 |
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| 摘 要： | 相位差是影响信号分辨的一个重要因素。当采样率足够高时,研究在分数阶傅里叶变换域两个线性调频(linear frequency modulation, LFM)信号的相位差与调频率分辨率的约束关系。通过建立调频率的分辨模型,推导出在两个LFM信号可分辨范围内相位差的上界和下界,只有当相位差处于上界和下界之间时,两个LFM信号才可以分辨。仿真结果表明,分辨率的理论值与实际值之间偏差较小,基本吻合。
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| 关 键 词： | 分数阶傅里叶变换 分辨率 线性调频 调频率 相位差 |
Relationship between chirp-rate resolution of LFM signals and phase difference in FRFT domain |
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| FENG Zhi-cheng,AN Jian-ping,WEI Jing-chong.Relationship between chirp-rate resolution of LFM signals and phase difference in FRFT domain[J].System Engineering and Electronics,2011,33(10):2194-2197. |
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| Authors: | FENG Zhi-cheng AN Jian-ping WEI Jing-chong |
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| Institution: | 1. School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China; ;
2. North Automatic Control Technology Institute, Taiyuan 030006, China |
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| Abstract: | Phase difference between signals effects deeply on signal resolution.In fractional Fourier transform(FRFT) domain,the relationship between phase difference and chirp-rate resolution of two linear frequency modulation(LFM) signals at high oversampling rate is investigated.By establishing a resolution model of chirp rate,the curves of upper bound and lower bound of phase difference is calculated when two LFM signals are distinguished.Only when phase difference is located at between the upper bound and the low... |
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| Keywords: | fractional Fourier transform(FRFT) resolution linear frequency modulation chirp rate phase difference |
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