| 恒虚警条件下线性调频连续波雷达信号的检测 |
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| 引用本文： | 陈旭敏,王晓江,潘韵天,郑国莘.恒虚警条件下线性调频连续波雷达信号的检测[J].电子测量技术,2016,39(12):98-103. |
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| 作者姓名： | 陈旭敏 王晓江 潘韵天 郑国莘 |
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| 作者单位： | 上海大学特种光纤与光接入网省部共建重点实验室 上海200072 |
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| 摘 要： | 线性调频连续波(LFMCW)信号是一种典型的非平稳信号,其频率随时间变化,需借助时频信号分析方法进行研究.因此本文主要目的在于通过仿真比较3种典型时频分析方法即:Wigner-Ville Hough transform(WVHT)、periodic WVHT(PWVHT)和cumulative WVHT (CWVHT)来寻找用于恒虚警率(CFAR)条件下检测LFMCW雷达信号的最优方法.首先介绍3种方法的特点,发现PWVHT算法复杂度较高;其次推导信号经过这三种变换方法后在起始频率和调制斜率处峰值的理论公式并进行仿真比较,发现当截取信号的时间大于一个信号周期并等于信号周期的整数倍时,CWVHT和PWVHT具有相同的性能且都高于WVHT;最后比较这些方法在CFAR条件下检测LFMCW雷达信号的性能,结果表明CWVHT方法在低SNR条件下有较好的检测性能.
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| 关 键 词： | LFMCW信号 非平稳信号 恒虚警率 时频分析 Hough变换 |
LFMCW radar signal detection under the condition of CFAR |
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| Chen Xumin,Wang Xiaojiang,Pan Yuntian and Zheng Guoxin.LFMCW radar signal detection under the condition of CFAR[J].Electronic Measurement Technology,2016,39(12):98-103. |
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| Authors: | Chen Xumin Wang Xiaojiang Pan Yuntian and Zheng Guoxin |
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| Affiliation: | Key laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200072, China,Key laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200072, China,Key laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200072, China and Key laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200072, China |
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| Abstract: | Linear frequency modulation continuous wave (LFMCW) signal is a typical nonstationary signal.Its frequency varies with time and requires time-frequency signal analysis method for research.So the main purpose of this paper is to search for the optimal method to detect LFMCW radar signal under constant false alarm rate (CFAR) by simulation comparison of three kind typical time-frequency analysis methods,such as Wigner-Ville hough transform (WVHT),periodic WVHT (PWVHT) and cumulative WVHT (CWVHT).First the characteristics of the three methods are introduced,from which we found PWVHT has higher algorithm complexity;Secondly theory formula is derived by comparing the peak of signal in the initial frequency and the modulation slope with these three methods,and simulation is made to find that when the intercepted signal time is greater than a signal cycle and equals to the integer times of signal cycle,CWVHT and PWVHT have the same performance which is higher than that of WVHT.Finally the detection performance of LFMCW radar signal under the CFAR condition among these methods is compared.The results show that CWVHT method under the low SNR condition has good detection performance. |
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| Keywords: | linear frequency modulation continuous wave nonstationary signal constant false alarm rate timefrequency analysis Hough transform |
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