Non-linear frequency modulated signal decomposition based on the improved chirplet time-frequency atom

被引：1
|
作者：
Guo P. [1 ]
Wang X. [1 ]
Cheng S. [1 ]
Wang F. [2 ]
机构：
[1] Aeronautics and Astronautics Engineering College, Air Force Engineering Univ., Xi'an
[2] Air Force Area Military Representatives Bureau in Shanghai, Shanghai
来源：
| 2018年 / Science Press卷 / 45期
关键词：
Genetic algorithm; Non-linear frequency modulated signal; Time-frequency atom; Time-frequency distribution;
D O I：
10.3969/j.issn.1001-2400.2018.01.022
中图分类号：
O56 [分子物理学、原子物理学];
学科分类号：
070203 ; 1406 ;
摘要：
Regarding the deficiencies that the Chirplet time-frequency atom has weak decomposition performance to non-linear frequency modulation signal of a sine type, an improved Chirplet atom (IChirplet) is proposed. First, it is analyzed that the Chirplet atom has a mismatch with time-frequency distribution of the non-linear signal. Then, a sine frequency modulation factor is introduced into the Chirplet atom to make the atom time-freqency curve have sine similarity bending performance. Finally, the matching pursuit algorithm is replaced by the genetic algorithm to improve the efficiency of atom searching. Simulation results show that the improved Chirplet atom has better decomposition performance to the non-linear frequency modulated signal compared with the Gabor, Chirplet, and FMmlet atom. © 2018, The Editorial Board of Journal of Xidian University. All right reserved.
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收藏
页码：123 / 128
页数：5
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