线性调频(LFM或Chirp)信号在雷达信号中已得到广泛使用。文中定性地分析了Radon-Wigner变换、分数阶Fourier变换和修正Chirp-Fourier变换检测离散Chirp信号的性能,计算了其对离散Chirp信号的能量聚集峰值。仿真试验表明,三种方法在信号长度为256点、信噪比为-5dB下都取得了较好的检测效果,相比之下,Radon-Wigner变换对离散Chirp信号的检测性能最优。
The chirp signal has been used widely in radar signals. The detection performances of three algorithms based on Radon-Wigner Transform(RWT), Fractional Fourier Transform(FRFT) and Modified Chirp-Fourier Transform(MDCFT) are analysed, and the energy concentration peaks on chirp signal of these three methods are computed. The final simulation results show that the three methods have remarkable capabilities of detecting chirp signal with length of 256 points and signal to noise rate of -5dB. In contrast, RWT is the best.