差分GPS实时数据解调算法研究与实现  

Research and implementation of differential GPS real-time data demodulation algorithm

作　　者：罗伟娟 李迟生[1] 虞贵财[1] 

机构地区：[1]南昌大学信息工程学院,江西南昌330031

出　　处：《现代电子技术》2018年第1期5-8,共4页Modern Electronics Technique

基　　金：国家自然科学基金(61661030)~~

摘　　要：差分GPS实时数据传输格式依据RTCM-SC104标准,采用MSK调制而成。为了精确地获取MSK信号的码元信息,针对差分GPS实时数据提出一种基于加窗滑动的离散哈特莱变换解调算法。该算法首先采用窗口长度为码元宽度,移动步长为1的矩形窗滑动后求码元同步,获取同步信息后再对其进行离散哈特莱变换,最后通过幅值信息还原出数字码元。经Matlab仿真结果表明,该解调算法性能比对比算法更优,实用性及适用性更广,最后在VC++平台上实现了差分GPS实时数据的正确解调。The real-time data transmission format of differential GPS is relied on RTCM-SC104 and formed with MSK modulation. A discrete Hartley transform demodulation algorithm based on windowing sliding is proposed for the differential GPS real-time data. With the algorithm, the slided rectangular window is used for symbol synchronization, whose window length is the symbol width and the moving step length is one; the acquired synchronization information is performed with discrete Hadley transform; the digital symbol is restored by means of amplitude information. The Matlab simulation results show that, in comparison with the reference algorithm, the demodulation algorithm has better performance, stronger practicability and broader feasibility. The correct demodulation of the differential GPS real-time data was realized on VC＋＋ platform.

关 键 词：离散哈特莱变换 差分GPS RTCM—SC104 MSK解调 误码率 同步 

分 类 号：P228.4[天文地球—大地测量学与测量工程]