摘要
全球卫星导航系统(Global Navigation Satellite System,GNSS)民用服务信号体制公开,容易受到恶意攻击和欺骗干扰。信号认证技术是一种有效的反欺骗手段。码移键控(code shift keying,CSK)可以在不改变扩频信号带宽的情况下,实现更高的信息传输速率,已经在卫星导航信号中开始应用。对此,提出一种基于双重CSK调相的卫星导航信号认证方法,认证信息的设计利用卫星导航信号的同步信息,使用双重CSK编码组合提高认证信息传输速率,通过调相的方式将认证信息调制到原始卫星信号上,在现有接收机结构的基础上给出了认证信号的接收解调方案。分析表明,该方法可以提高认证信息速率,同时保证卫星导航信号的恒包络特性,通过调整CSK参数和双重组合方式,可改变认证信息速率;通过改变调相角度可以改变认证信号分配的功率比,控制卫星导航信号的信噪比损失,满足不同条件要求下的信号认证需求。
The civilian service signal of global navigation satellite system(GNSS)is publicly accessible and vulnerable to malicious attacks and deception.Signal authentication technology is an effective anti-spoofing method.Code shift keying(CSK)enables higher information transmission rates without altering the bandwidth of spread spectrum signals,and is used in satellite navigation signals.In this regard,an authentication method for satellite navigation signals based on dual CSK phase modulation is proposed.The authentication information design uses the synchronization information of satellite navigation signals.Signal authentication uses dual CSK encoding combination to improve the authentication information transmission rate.The authentication information is modulated onto the original satellite signal through phase modulation.A reception and demodulation scheme for the authentication signal is provided based on existing receiver structures.Analysis demonstrates that this method can increase the authentication information rate while preserving the constant envelope characteristic of satellite navigation signals.The authentication information rate can be further improved by adjusting CSK parameters and the dual combination method.The power ratio of the authentication signal distribution can be changed by adjusting the phase modulation angle.By controlling the signal-to-noise ratio loss of satellite navigation signals,meet the signal authentication requirements with different conditions.
作者
巴晓辉
向彬
蔡伯根
王剑
姜维
梁坤
柴琳果
张爽娜
BA Xiaohui;XIANG Bin;CAI Baigen;WANG Jian;JIANG Wei;LIANG Kun;CHAI Linguo;ZHANG Shuangna(School of Automation and Intelligence,Beijing Jiaotong University,Beijing 100044,China;State Key Laboratory of Rail Traffic Control and Safety,Beijing 100044,China;Beijing Engineering Research Center of EMC and GNSS Technology for Rail Transportation,Beijing 100044,China;Space Star Technology Co.,Ltd.,Beijing 100095,China)
出处
《系统工程与电子技术》
北大核心
2025年第8期2676-2685,共10页
Systems Engineering and Electronics
基金
国家自然科学基金联合基金(U2468202,U2268206)
国家自然科学基金重大仪器项目(62027809)
国家自然科学基金(T2422002)
北京市自然科学基金-丰台轨道交通前沿研究联合基金(L211004)
北京交通大学人才基金(2022XKRC003)资助课题。
关键词
全球导航卫星系统
码移键控
信号认证
调相
global navigation satellite system(GNSS)
code shift keying(CSK)
signal authentication
phase modulation
