摘要
针对现有水声通信系统抗干扰性能不佳和易受多普勒效应影响的问题,提出了基于分数阶Fourier变换的脉冲位置调制(fractional Fourier transform-pulse position modulation,FRFT-PPM)的水声通信系统方案及分数阶域多普勒效应补偿方法。FRFT-PPM水声通信系统采用线性调频(linear frequency modulation,LFM)信号作为通信载波,借用PPM原理将信息调制到分数阶域脉冲位置中进行传输,具有通信速率可调,最高可达1.6kbit/s,抗噪声干扰能力强的优点。根据LFM信号较大多普勒容限和分数阶Fourier变换尺度变换特性,采用分数阶域分数阶域峰值位置补偿来抑制相对运动产生的多普勒效应。通过大量计算机仿真和湖试试验,验证了FRFT-PPM通信系统及分数阶域多普勒效应补偿算法的有效性与可行性。
Aimming at the problems of poor anti-jamming performance and easily being influenced by Doppler effect of the underwater acoustic （UWA） communication system, the UWA communication system scheme based on the fractional Fourier transform pulse position modulation（FRFT-PPM） and the Doppler com- pensation method in fractional domain are proposed. The FRFT-PPM system employs the linear frequency mod- ulation （LFM） signal as carrier signals and translates information modulated by peak position in fractional do- main based on PPM principle, which has the advantages of an adjustable communication rate （the maximum rate is up to 1.6 kbit/s） and a good anti-noise disturbance performance. According to large Doppler tolerance of LFM signals and the scale transmission property of FRFT, the peak position compensation in fractional domain is presented to suppress Doppler effect caused by the relative motion of platform. The feasibility and robustness of this system are verified by a large number of computer simulation and lake experiments.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2013年第2期430-435,共6页
Systems Engineering and Electronics
基金
国家自然科学基金(51009041
51179034
60802060)
教育部高等学校博士学科点专项科研基金(200802171061)
海洋公益性行业科研专项经费基金(20100500105)
海军工程大学科学研究基金(201200000071)
上海交通大学海洋工程国家重点实验室开放课题(1007)资助课题
关键词
分数阶域
脉冲位置调制
多普勒效应
水声通信
fractional domain
pulse position modulation （PPM）
Doppler effect
underwater acoustic com- munication
