红外与毫米波学报2024，Vol.43Issue(2)：261-267,7.DOI:10.11972/j.issn.1001-9014.2024.02.016
大气介质红外辐射场混沌与分形特征
Chaotic and fractal characteristics of infrared electromagnetic wavefield in the media of atmosphere
摘要
Abstract
Chaotic dynamics is a significant systematic feature of infrared electromagnetic wavefields that requires further study.Understanding the chaotic dynamics of infrared radiation wavefields can lead to advancements in high-performance detection,imaging,and recognition of weak,moving,time-varying signals.To extract the time series of the dynamic sys-tem,we have established a 4D time-space observing system.We then use the FFT transform on a random time series of frequency-band infrared data to obtain the fractional Brownian motion dimension,indicating a fractal structure in the at-mospheric infrared radiation wavefield.By using time-delay analysis,we construct a dimensional phase space and com-pute the fractal dimension.We also observe that the first Lyapunov exponent remains positive in different phase spaces,leading to the initial conclusion that the atmospheric infrared wavefield is chaotic.To measure the chaotic strength of real cases in the time-space domain,we use the permutation entropy.These results serve as a foundation for further research,such as understanding the dynamic evolution mechanism of moving objects and their background wavefields,capturing time-varying signals,and making long-term nonlinear predictions of infrared wave behaviors in different domains.关键词
混沌/Lyapunov指数/分形维度/相关维度/排列熵Key words
chaos/Lyapunov exponents/fractal dimension/correlation dimension/permutation entropy分类
数理科学引用本文复制引用
徐文君,孙胜利,刘高睿..大气介质红外辐射场混沌与分形特征[J].红外与毫米波学报,2024,43(2):261-267,7.基金项目
万人计划领军人才项目 （）
中国科学院引才计划-B类人才项目Supported by the Leading Talent of"Ten Thousand Plan"-National High Level Talents Special Support Plan （）
the One Hundred Per-son Project of the Chinese Academy of Sciences-B （）
