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。
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.
出处
《计算机工程》
CAS
CSCD
北大核心
2011年第18期81-83,共3页
Computer Engineering
基金
国家自然科学基金资助项目(60772037)
江西省卫生厅科技计划基金资助项目(20092076)
江西省自然科学基金资助项目(2009GES0068)
江西省教育厅科技基金资助项目(GJJ10266)
关键词
自适应时频分布
分数低阶模糊函数
Α稳定分布
最优核函数
分数低阶短时自适应时频分布
adaptive time-frequency distribution
fractional low-order ambiguity function
α stable distribution
optimal kernel function
Fractional Low-order Short Time Adaptive Time-frequency Distribution(FLO-STATFD)