摘要
针对目前线性调频(chirp,LFM)信号参数估计算法运算量较大且估计参数较少的问题,在分析Radon-Wigner变换(RWT)和分数阶傅里叶变换(FrFT)应用于chirp信号参数估计的基础上,提出了一种基于Wigner-Ville分布(WVD)切片和FrFT的chirp信号参数估计新算法。该算法首先通过对观测信号两个WVD切片的计算估计出调频斜率,然后得到相应的FrFT阶数,最后利用一次FrFT估计出chirp信号的初始频率、初始相位和幅度等参数。整个算法只需三次FFT的计算量即可估计出chirp信号的四个参数。仿真实验表明了该算法能在低信噪比下实现chirp信号参数的快速有效估计。
In order to reduce the computation complexity of parameter estimation for chirp signals and increase the estimated parameters, a new algorithm based on Wigner-Ville distribution slice and fractional Fourier transform is presented through the application of chirp signals parameter estimation based on Radon-Wigner transform and fractional Fourier transform. Firstly, the fre-quency rate is estimated through two WVD slices of observation signals, and then getting the or-der of FrFT. Finally, the other parameters, including initial frequency, initial phase and ampli-tude, are estimated by once FrFT. The whole processing just needs three times of FFT computa-tion complexity and can estimate all the chirp signal parameters. Simulation results show that the algorithm can estimate the parameters of chirp signal quickly and effectively at low SNR.
出处
《电子信息对抗技术》
2014年第3期1-6,57,共7页
Electronic Information Warfare Technology
关键词
线性调频
WVD分布
分数阶FOURIER变换
参数估计
linear frequency modulation
WVD distribution
fractional Fourier transform
parameter estimation