摘要
提出了基于互伪Wigner-Ville分布(XPWVD)的时频迭代法,理论分析了迭代的收敛性,并给出了具体的实现方法。利用该方法对几种常见的雷达非线性调频信号进行了瞬时频率(instantaneous frequency,IF)估计。仿真结果表明,在低信噪比(SNR)的情况下,利用此频迭代法,可以有效地提取非线性调频信号的IF特征。
A time frequency iterative method based on the cross pseudo Wigner-Ville distribution (XPWVD) is presented. The convergence of the method is analyzed theoretically and the details about the realization of this method is given. Through the method instantaneous frequency about several normal nonlinear frequency modulation (FM) signals in radar are estimated. This time frequency iterative method is effective in estimating the IF of non- linear FM signals at a low signal noise ratio(SNR) according to the simulation.
出处
《科学技术与工程》
北大核心
2013年第31期9390-9395,共6页
Science Technology and Engineering
关键词
互伪Wigner-Ville
时频迭代
瞬时频率
cross pesudo Wigner-Ville distribution time frequency iteration instantaneous frequency