宽带非平稳信号的瞬时频率测量方法  

Instantaneous frequency measurement method for the broadband non-stationary signal

作　　者：王海[1] 范文晶[2] 郑胜峰[3] 

机构地区：[1]西安电子科技大学机电工程学院,陕西西安710071 [2]上海航天局第八设计部,上海200233 [3]浙江工贸职业技术学院,浙江温州325003

出　　处：《西安电子科技大学学报》2011年第6期55-61,共7页Journal of Xidian University

基　　金：国家自然科学基金资助项目(10703004);中央高校基本科研业务费专项资金资助项目(JY10000904004)

摘　　要：针对宽带非平稳信号,提出一种瞬时频率测量方法.利用加限自适应滤波器将信号分解为多个渐进单频信号,根据其解析信号的相位函数求出其瞬时频率;综合所有分量的时频关系实现对宽带非平稳信号瞬时频率的准确测量.仿真实验和误差分析结果表明,该方法克服了Fourier分析、Wavelet变换和Hilbert-Huang算法求解宽带非平稳信号瞬时频率的困难,在整个分析频段都能实现较高的频率测量分辨率,对信噪比在0dB以上的信号具有优于0.2MHz的测量误差.对8μs长度信号,该方法除了有25.816μs初始运算延时外,对连续数据处理具有实时性,能够满足宽带非平稳信号频率的瞬时测量要求.An instantaneous frequency measurement method for broadband non-stationary signal is presented.The signal can be decomposed into progressive single-frequency signals by added qualification adaptive filters.According to their phase functions of analytical signals,the instantaneous frequencies are obtained.By integration of time-frequency relationship of all components,the instantaneous frequencies of broadband non-stationary signal are accurately measured.Simulation and error analysis prove that this method overcomes the difficulties in instantaneous frequency measuring of Fourier analysis,Wavelet transformation and Hilbert-Huang algorithm for the broadband non-stationary signal.In the whole analyzed frequency band it can achieve a higher frequency measurement resolution and has a measurement error of less than 0.2MHz for the signals with an SNR of above 0dB.For 8μs long signal,this method has a better real-time processing capability,but an initial operational delay of 25.816μs.Therefore,this method can meet the requirements of instantaneous frequency measurement for the broadband non-stationary signal.

关 键 词：宽带非平稳信号 瞬时频率测量 自适应滤波 HILBERT变换 误差分析 

分 类 号：TN91[电子电信—通信与信息系统]