摘要
奈伏泰斯(NAVTEX)系统是一种在航海业广泛运用的窄带直接印字电报系统。针对其信号频偏的极窄性和海上作业的特殊性,对NAVTEX接收机的解调方法进行了综述。介绍了FM解调芯片、琐相环模拟解调方法,并进行了实践分析,再着重针对正交延时、STFT数字解调方法应用于NAVTEX接收系统进行原理分析和仿真验证。同时,还对现代信号处理技术应用于NAVTEX信号接收进行了讨论。通过对各种方法运用于NAVTEX接收机的优缺点进行比较,可供相关研究人员借鉴。
NAVTEX is a narrow band direct printing telegraph system used widely in nautical industry. The demodulation algorithm in NAVTEX receiver is summarized based on the narrow frequency offset of its signals and the particularity of operation at sea. Its special FM demodulation chip and PI.I. analog demodulation are introduced and analyzed practically. The theory of delay-multiple demodulation and the methods of STFT digital demodulation are expatiated and validated and the application of modern signal processing technique in NAVTEX receiver is discussed. The comparison results of various NAVTEX demodulation algorithms shall be a reference for the people working in the related fields.
出处
《中国航海》
CSCD
北大核心
2008年第2期100-104,共5页
Navigation of China
关键词
船舶、舰船工程
印字电报
模拟解调
数字解调
现代信号处理
ship,naval engineering
printing telegraph
analog demodulation
digital demodulation
modern signalprocessing
