低载噪比突发扩频信号的快速捕获设计  

Design of Fast Acquisition of Burst Spread Spectrum Signal with Low Carrier-to-Noise Ratio

作　　者：张兰粉 苌军红 张亚林[1] 杨再秀 ZHANG Lanfen;CHANG Junhong;ZHANG Yalin;YANG Zaixiu(The 54th Research Institute of CETC,Shijiazhuang 050081,China;The 1st Military Liaison Office of the Army Armaments Department’s Beijing Military Representative Bureau in Shijiazhuang,Shijiazhuang 050081,China)

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081 [2]陆军装备部驻北京地区军事代表局驻石家庄地区第一军事代表室,河北石家庄050081

出　　处：《无线电通信技术》2024年第3期609-614,共6页Radio Communications Technology

摘　　要：突发扩频信号是卫星无线电测定业务的一种扩频调制信号,针对传统突发扩频信号,即入站信号,对快速捕获灵敏度要求越来越高的需求,提出了一种低载噪比突发扩频信号的快速捕获硬件设计实现方法。利用同步头加Walsh码基于快速傅里叶变换(Fast Fourier Transform,FFT)的突发扩频信号全并行处理的方法,入站信号快捕接收的积分时长能够达到15 ms,相较于传统的捕获算法,性能实现了约2 dB的提升。仿真验证及工程实现结果表明,该方案载噪比可达到37.5 dBHz,为未来全球化小型化通用化接收终端提供了改进方向。Burst spread spectrum signal is a type of spread spectrum modulation signal used in radio determination satellite service.In response to increasing sensitivity requirements for fast capture of traditional burst spread spectrum signals,namely inbound signals,a h ardware design and implementation method for fast capture of low carrier to noise ratio burst spread spectrum signals is proposed.With a joint capture scheme of synchronous head and Walsh code and a burst spread spectrum signal fully parallel processing method based on Fast Fourier Transform(FFT),the integration time for fast capture and reception of inbound signals can reach 15 ms.Compared with traditional capture algorithms,the performance can be improved by about 2 dB.Simulation verification and engineering implementation results show that the proposed scheme can achieve a carrier to noise ratio of 37.5 dBHz,providing an improvement direction for future global small-scale universal receiving terminals.

关 键 词：低载噪比 突发扩频信号 快速捕获 

分 类 号：TN914.42[电子电信—通信与信息系统]