【作者】 于凤芹； 曹家麟；

【Author】 YU Feng-qin~(1,2) and CAO Jia-lin~1 (1:School of Machine Electronic and Automation,Shanghai University,Shanghai 200072,China) (2:School of Communication and Control,Jiangnan University,Jangsu,wuxi 214036,China)

【机构】 上海大学机械电子与自动化学院； 江南大学通信与控制学院；

【摘要】 以广泛出现在工程应用和许多物理现象中的多分量Chirp信号为对象,研究了Cohen类时频分布对这种信号时频表示性能,定量地描述了各种时频分布的时频聚集程度,分析了交叉项的特点和抑制机理,提出了现有的Cohen类时频分布对该类信号交叉项抑制存在局限,仿真结果验证了理论分析的正确性。更多还原

【Abstract】 An analysis on performance of the time-frequency distributions of Cohen’s class for multi-component chirp signals, which are often appeared in some engineering applications and many natural phenomena,is given in this paper,including the descriptions of time-frequency concentration and the characteristics of cross-terms interference and the mechanism of cross-terms reduce for multi-component chirp signals.The limitations of cross-terms interference reduce of the existing Cohen’s time-frequency distributions are presented.The simulations correspond with the theoretic analysis we have proposed.更多还原