一种北斗三号短报文终端的快速捕获算法  

A fast acquisition algorithm of Beidou⁃3 short message terminal

作　　者：蔡文炳[1] 陈美杉 张银辉 徐峰[2] 潘鑫[2] CAI Wenbing;CHEN Meishan;ZHANG Yinhui;XU Feng;PAN Xin(Beijing Institute of Tracking and Telecommunication Technology,Beijing 100094,China;Beijing Institute of Spacecraft System Engineering,Beijing 100094,China)

机构地区：[1]北京跟踪与通信技术研究所,北京100094 [2]北京空间飞行器总体设计部,北京100094

出　　处：《现代电子技术》2023年第7期10-13,共4页Modern Electronics Technique

摘　　要：北斗三号全球短报文通信系统可以满足全球、全天候、长远距离、高动态的使用需求。针对北斗三号短报文终端产品高动态使用环境的需求,文中提出一种快速的捕获跟踪算法,采用并行相关+FFT的传统架构,通过大量的仿真数据验证不同的并行路数和FFT点数下的捕获性能,最终实现12 km/s使用条件下的快速捕获。Beidou⁃3 global short message communication system can meet the needs of global,all⁃weather,long⁃distance and high⁃dynamic.Due to the characteristics of MEO(medium earth orbit)satellite′s non⁃stationary orbit,there is a larger Doppler frequency shift in comparison with the ground mobile terminal.A fast capture and tracking algorithm is proposed in this paper.The traditional architecture of parallel correlation+FFT is adopted in the capture algorithm.The capture performance of the algorithm is verified with a large number of simulation data when the parallel channels and FFT pointsare different.The fast capture is realized under the condition of 12 km/s.

关 键 词：北斗三号 短报文 通信系统 快速捕获 捕获算法 跟踪算法 仿真分析 

分 类 号：TN967.1-34[电子电信—信号与信息处理]