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