面向北斗导航电文认证的符号级欺骗方法研究
Research on symbol level attack method targeting BeiDou navigation message authentication
付晨罡 1陈潇 2刘婷 2罗瑞丹 2黄丹丹2
作者信息
- 1. 中国科学院空天信息创新研究院,北京 100094;中国科学院大学电子电气与通信工程学院,北京 100049
- 2. 中国科学院空天信息创新研究院,北京 100094
- 折叠
摘要
导航电文认证(NMA)技术已成为抵御生成式欺骗、保护全球卫星导航系统(GNSS)民用信号的重要发展方向之一.针对NMA在不改变导航电文的情况下难以抵御欺骗的漏洞,提出了面向北斗NMA的符号级欺骗(SLA)方法,并设计了最大后验概率(MAP)符号估计改进算法,以历次MAP估计值的众数作为新估计量,实现导航电文的快速恢复.基于北斗B1C信号NMA方案开展了欺骗效果评估试验.结果表明,在载噪比大于45 dB·Hz和短估计时延(小于30 μs)条件下,SLA针对北斗B1C认证电文能够达到90％的序列欺骗成功率,与安全码估计-重放(SCER)相比,该方法能够显著降低符号误码率,缩短估计时延,具有更好的欺骗效果,也将为北斗NMA设计优化提供技术支撑.
Abstract
Navigation message authentication(NMA)technology has become one of the important development directions for defending against generative spoofing and protecting global navigation satellite system(GNSS)civilian signals.In view of the vulnerability that NMA is difficult to de-fend against the spoofing without changing navigation message,a symbol level attack(SLA)method for BeiDou NMA is proposed,and an improved maximum a posteriori(MAP)symbol esti-mation algorithm is designed.The mode of the MAP estimates over time is used as the new esti-mator to achieve rapid recovery of navigation message.A spoofing effectiveness evaluation experi-ment based on the BeiDou B1C signal NMA scheme is carried out.The results show that under the conditions of carrier-to-noise ratio greater than 45 dB·Hz and short estimator delay(less than 30 μs),SLA can achieve a sequential spoofing success rate of 90％for BeiDou B1C authentication message.Compared with security code estimation and replay(SCER),this method can signifi-cantly reduce the symbol error rate,shorten the estimator delay,and has better spoofing effective-ness,providing technical support for the design optimization of BeiDou NMA.
关键词
符号级欺骗/导航电文认证/北斗卫星导航系统/最大后验概率估计Key words
Symbol level attack/Navigation message authentication/BeiDou navigation satellite system/Maximum a posteriori estimator引用本文复制引用
出版年
2024
NETL
NSTL
万方数据