一种自适应Chirplet分解的快速算法  

A Fast Implementation of Adaptive Chirplet Decomposition

作　　者：王勇[1] 姜义成[1] 

机构地区：[1]哈尔滨工业大学电子工程技术研究所,黑龙江哈尔滨150001

出　　处：《电子学报》2007年第4期701-704,共4页Acta Electronica Sinica

基　　金：教育部博士点基金(No.20060213009)

摘　　要：针对信号自适应Chirplet分解未知参数多、实现起来比较困难的特点,提出了一种新的Chirplet分解快速算法.该算法利用计算信号的二次相位函数,得到其能量分布集中于信号的调频率曲线上的结论,此时通过谱峰检测可同时获得Chirplet调频率、时间中心和幅度的估计;然后通过解线性调频技术获得其初始频率和时间宽度的估计.文中给出了实现该方法的具体步骤,并分别以仿真信号和蝙蝠回声定位信号为例验证了该算法的有效性.The adaptive Chirplet decomposition contains a lot of unknown parameters and has much difficulty in its implementation.In this condition,a fast implementation of adaptive Chirplet decomposition is presented in this paper. By computing the quadratic phase （QP） function of the signal,it is shown that the QP function is concentrated along the frequency rate curve of the signal,and the peak of the QP function yields the estimates of the Chirplet rate,time center and the amplitude;Then the initial frequency and the time extent can be obtained by the dechirp technique. The scheme of the algorithm is shown in this paper, and the results of simulated data and echolocation signal from brown bat demonstrate the validity of the method proposed.

关 键 词：自适应Chirplet分解 二次相位函数 调频率曲线 

分 类 号：TN959.72[电子电信—信号与信息处理]