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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。
This paper firstly introduces the concept of instantaneous frequency (IF) and the traditional calculation method of IF - analytic signal method, then discusses the physical meaning of IF and its relation with time-frequency distribution from the point of view of joint time-frequency analysis, One of the tasks of the time-frequency distribution is to estimate the IF, and the comparison of the performance of several time-frequency distributions shows that the choice of the distribution form has a great influence on the estimation effect. Finally, this paper presents and preliminarily demonstrates the validity of adaptive rotation projective decomposition (AOP) to calculate IF.