甚低频Chirp扩频通信体制及大气噪声干扰抑制技术  

VLF Chirp Spread Spectrum Communications and Atmospheric Noise Interference Suppression

作　　者：王华力[1] 吴燕军[1] 郝欢[1] 刘榕[2] 马满仓[2] 

机构地区：[1]解放军理工大学通信工程学院 [2]总参第61研究所

出　　处：《现代军事通信》2014年第4期8-12,共5页

摘　　要：文中研究将Chirp扩频体制应用于甚低频通信。首先给出Chirp扩频通信方案，重点讨论一种基于分数阶傅里叶变换的非相干解调方法；然后分析甚低频无线信道中大气噪声干扰的影响，并采用Alpha稳定分布对大气噪声统计特性进行信道建模与仿真，在此基础上进一步研究采用时域削波处理的大气噪声干扰抑制方法，仿真验证了其有效性。Chirp spread spectrum techniques are applied in very low frequency （VLF） communication in this paper. Firstly, we provide a chirp spread spectrum communication system scheme and discuss a noncoherent demodulation method based on fractional Fourier transform. Then the effects of atmospheric noise on VLF communication channels are analyzed. Alpha stable distributions are also introduced to channel modeling based on the statistical characteristics of the atmospheric noise. Finally, we study the interference suppression method by clipping in time domain. The corresponding simulation results verify the validity of the proposed method.

关 键 词：甚低频通信 Chirp扩频 大气噪声 分数阶傅里叶变换 ALPHA稳定分布 干扰抑制 

分 类 号：TN958[电子电信—信号与信息处理]