恒虚警条件下线性调频连续波雷达信号的检测

发布时间：2018-04-29 19:52

本文选题：LFMCW信号 + 非平稳信号　；参考：《电子测量技术》2016年12期

【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。
[Abstract]:Linear frequency modulated continuous wave (LFMCW) signal is a kind of typical non-stationary signal, whose frequency varies with time, which needs to be studied by time-frequency signal analysis method. Therefore, the main purpose of this paper is to compare three typical time-frequency analysis methods, namely: Wigner-Ville Hough transform-WVHTperiodic PWVHTT) and cumulative WVHT-CWVHTT, to find the best method for detecting LFMCW radar signals under the condition of constant false alarm rate (CFAR). Firstly, the characteristics of the three methods are introduced, and the complexity of the PWVHT algorithm is found to be high. Secondly, the theoretical formulas of the peak value of the signal at the initial frequency and modulation slope are deduced and compared by simulation. It is found that CWVHT and PWVHT have the same performance and higher performance than WVHTs when the time of intercepting signal is longer than one signal period and is equal to the integer times of signal period. Finally, the performance of these methods in detecting LFMCW radar signal under CFAR condition is compared. The results show that CWVHT method has better detection performance under low SNR condition.
【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;
【分类号】：TN957.51

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