eLoran系统新型数据调制/信道编码方案设计与评估  

Design and evaluation of a new data modulation and channel coding scheme for eLoran system

作　　者：李婉清 王建辉 李实锋[3] 傅其祥 LI Wanqing;WANG Jianhui;LI Shifeng;FU Qixiang(Sun Yat-sen University,Guangzhou 510006,China;Hong Kong Applied Science and Technology Research Institute Company Limited,Hong Kong 999077,China;National Time Service Center,Chinese Academy of Sciences,Xi′an 710600,China)

机构地区：[1]中山大学,广东广州510006 [2]香港应用科技研究院,香港999077 [3]中国科学院国家授时中心,陕西西安710600

出　　处：《全球定位系统》2020年第5期84-89,共6页Gnss World of China

基　　金：国家自然科学基金(91938301,61973328);国家重点研发计划重点专项(2018YFB0505200)。

摘　　要：增强型罗兰(eLoran)系统是精确时频信息的一个重要来源,且为全球卫星导航系统(GNSS)的有效备份.本文针对目前eLoran信号调制方式较单一,数据传输速率低的问题,同时为充分运用时频资源、扩大信息播发数据量与应用范围,提出一种提高信号信息携带能力的调制方式和具有更高编码增益的信道编码方式.新型的脉冲调制方式增加仅用于数据传输脉冲组的调制方式,可实现40~200 bps的传输速率.仿真实验表明,数据信息长度为215 bit左右,LDPC编码方式能够较好地兼顾编码增益和信号帧长.Enhanced Loran system(eLoran)is an important source of precise time-frequency information and an effective backup of global satellite navigation system.Aiming at the problems of single modulation mode and low data transmission rate of eLoran signal and in order to make full use of the time-frequency resources,expand the amount of data broadcast and application range,this paper proposes a modulation method to improve the carrying ability of signal information and a channel coding method with higher coding gain.The transmission rate of 40~200 bps can be achieved by adding the pulse group that only used for data transmission in the novel modulation mode.The simulation results show that LDPC coding can give better consideration to both coding gain and signal frame length when the length of data information is about 215 bit.

关 键 词：增强罗兰导航系统 数据调制 信道编码 性能评估 传输速率 

分 类 号：P228.4[天文地球—大地测量学与测量工程]