基于一维Lozi混沌映射的PFM技术研究

摘要

The chaos frequency modulation has possessed an important position in the pulse frequency modulation(PFM)technique due to its good broadband characteristic. The principle of chaos frequency modulation is obtained through Fourier analysis of the square pulse with chaotic modulation or not. And the sequence feature of one-dimensional Lozi map is discussed. An inverter experimental platform is constructed on that basis,then one-dimensional Lozi map chaos is used in PFM experiment. Modulation effects such as maximum amplitude decreasing,additional harmonic's generation and their eliminations are compared. And then some factors with the one-dimensional Lozi map sequence feature to affect frequency modulation have summarized.Therefore, the certain rules to select proper chaotic sequence for the purpose of pulse frequency modulation are provided according to the results of the paper.%混沌频率调制由于其良好的宽频特性已在脉冲频率调制(PFM)技术中占有重要地位,在此通过对加入混沌调制前后的方波脉冲进行傅里叶分析,对比得出了混沌频率调制的原理,并讨论了一维Lozi混沌映射序列的分布特性.在此基础上,构建了基于脉冲频率调制的逆变器试验平台,采用一维Lozi混沌映射进行了PFM实验.对该混沌映射下的最大幅值下降、新谐波产生与消除等混沌频率调制效果进行详细对比分析,得出了影响混沌频率调制效果的若干因素,为今后进行混沌序列的选择提供了理论与实验依据.