【摘要】 针对复杂电磁环境下的多普勒目标检测问题,首先建立了实际目标的多普勒回波模型,对现有Wigner-Ville分布方法进行了总结,并将其应用于与雷达回波信号瞬时频率提取过程中.仿真结果表明,在高斯白噪声情况下,利用瞬时频率可有效获取信号的时频信息,Wigner-Ville分布、准Wigner-Ville分布以及平滑伪Wigner-Ville分布可实现不同频率回波信号的分离,而平滑准Wigner-Ville分布可有效抑制交叉项.更多还原

【Abstract】 Aimed at the problem of Doppler target detection in complex electromagnetic environment,a Doppler echo wave model for actual signal was firstly constructed,and the Wigner-Ville distribution methods were analyzed and summarized.When Wigner-Ville distribution methods are applied to extract instantaneous frequency,the simulation results show that time-frequency features of radar signals can be effectively extracted by instantaneous frequency method in the additive white Gaussian noise environment,and separation of echo signals with different frequencies can be achieved by Wigner-Ville distribution,pesudo-Wigner-Ville distribution and smoothly pesudo-Wigner-Ville distribution,while smoothly pesudo-Wigner-Ville distribution can effetively suppress cross-terms suppression.更多还原