摘要
本文首先介绍了瞬时频率(IF)的概念和IF的传统计算方法——解析信号法,然后从联合时频分析的角度讨论了IF的物理含义及其与时频分布之间的联系,指出二维时频分布的任务之一是对IF进行估计,并且通过对几种时频分布估计性能的比较说明分布形式的选择对估计效果有较大影响。最后,本文提出并初步论证了自适应旋转投影分解法(AOP)计算IF的有效性。
The concept of instantaneous frequency(IF) and its traditional construct method
- analytic method are introduced in this paper. Then by means of joint time-frequency analysis, the physical meaning of IF and its relation with the time-frequency distributions are also discussed. It is pointed out that one of the destinations of 2-D time-frequency distributions is to estimate the IF, and the different distribution can be of different effect. The performances of several popular distributions are compared, consequently AOP method is found to be a suitable one to estimate the IF.
基金
国家教委跨世纪优秀人才基金
国防重点实验室基金
关键词
瞬时频率
时频分布
自适应信号处理
Instantaneous frequency, Time-frequency distribution, Adaptive signal processing
