【摘要】 信号中的α稳定分布噪声会使自适应时频分布方法失效。针对该问题,利用分数低阶统计量理论,提出一种改进的分数低阶自适应时频分布。为了实现带噪信号的实时在线处理及长时间信号的时频分布分析,给出一种分数低阶短时自适应时频分布。仿真结果表明,2种方法都能在含有α稳定分布噪声和高斯噪声的环境下进行有效的时频分布分析。更多还原

【Abstract】 In order to solve the problem that adaptive time-frequency distribution method is invalid in α stable distribution noise environment,this paper proposes an improved Fractional Low-order Adaptive Time-frequency Distribution(FLO-ATFD).And it proposes Fractional Low-order Short Time Adaptive Time-frequency Distribution(FLO-STATFD) to analyze time-frequency distribution of long-time signals and process signals on-line in α stable distribution noise environment.Simulation results indicate that two methods perform effective time-frequency distribution analysis in α stable distribution noise and Gaussian distribution noise environment.更多还原