基于PGC技术的水下极低频信号检测解调方式研究  

Underwater Extremely Low Frequency Signal Detection and Demodulation based on PGC Technology

作　　者：何如龙[1] 孙剑平 隗小斐 HE Ru-long;SUN Jian-ping;WEI Xiao-fei(College of Electronic Engineering,Naval University of Engineering,Wuhan Hubei 430033,China;Naval Staff Headquarters Command Support Team,Beijing 100086,China)

机构地区：[1]海军工程大学电子工程学院,湖北武汉430033 [2]海参指挥保障大队,北京100086

出　　处：《通信技术》2019年第12期2851-2855,共5页Communications Technology

摘　　要：相位生成载波(Phase Generation Carrier,PGC)技术属于一种普遍运用在光纤传感器的特殊调制解调法。简要概述PGC的定义以及调制原理,对PGC解调方法中存在的反正切(Arctangent)与微分交叉相乘(Differential Cross Multiplication,DCM)两种相位抽取算法运用于极低频信号解调展开全面的理论剖析及算法仿真,结果表明,Arctangent式算法比DCM算法相对简单,显著提高了系统的实时性,而且Arctangent式算法不具有DCM算法解调极低频信号时出现的各类直流漂移问题。Phase Generation Carrier(PGC)technology belongs to a special modulation and demodulation method,which is widely used in optical fiber sensors.The definition and modulation principle of PGC are briefly summarized.The two theoretical phase extraction algorithms—Arctangent and Differential Cross Multiplication(DCM)in PGC demodulation method are applied to demodulate very low frequency signals.The results indicate that the Arctangent algorithm is relatively simpler than the DCM algorithm,which significantly improves the real-time performance of the system.Moreover,the Arctangent algorithm does not have the various DC drift problems that occur when the DCM algorithm is used to demodulate very low frequency signals.

关 键 词：相位生成载波 干涉型光纤传感器 极低频 水声信号 

分 类 号：TN929.3[电子电信—通信与信息系统]