基于钟差检验的GNSS授时欺骗检测与识别

doi:10.12305/j.issn.1001-506X.2022.03.27

摘要/Abstract

摘要：

针对牵引式欺骗对授时接收机危害性强且难以检测的问题，基于授时欺骗的实施原理分析了授时解的变化规律, 利用欺骗实施后钟差必然累积异常的特点, 提出了一种钟差构造检验统计量的授时欺骗检测与识别方法。分析了该方法的检测性能, 并通过蒙特卡罗仿真验证了理论的正确性。最后使用软件接收机对TEXBAT(Texas spoofing test battery)授时欺骗场景数据进行测试验证了该方法的有效性。由于不需要接收机添加额外的硬件且在无位置信息辅助的情况下该算法依然能够检测欺骗, 因此对全球卫星导航系统授时安全具有较高的应用价值。

关键词: 全球卫星导航系统, 授时欺骗, 钟差, 欺骗检测

Abstract:

Aiming at the problem that traction deception is harmful to the time service receiver and difficult to detect, based on the implementation principle of time service deception, the change law of time service solution is analyzed. Taking advantage of the characteristics that the clock difference must accumulate abnormity after the implementation of deception, a time service deception detection and recognition method using the clock difference to construct the test statistics is proposed. The detection performance of this method is analyzed, and the correctness of the theory is verified by Monte Carlo simulation. Finally, the software receiver is used to test the time spoofing scene data of TEXBAT (Texas spoofing test battery) to verify the effectiveness of this method. Because there is no need to add additional hardware to the receiver and the algorithm can still detect deception without the assistance of location information, it has high application value for global navigation satellite system timing security.

Key words: global navigation satellite system (GNSS), time spoofing, clock bias, spoofing detection

中图分类号:

TN973

付栋, 彭竞, 马明, 陈飞强, 欧钢. 基于钟差检验的GNSS授时欺骗检测与识别[J]. 系统工程与电子技术, 2022, 44(3): 948-955.

Dong FU, Jing PENG, Ming MA, Feiqiang CHEN, Gang OU. GNSS time spoofing detection and discrimination based on clock bias hypothesis test[J]. Systems Engineering and Electronics, 2022, 44(3): 948-955.

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参数	类型
参数	TCXO	OCXO	CSAC
h₀(s)	1.9e-21	3.4e-22	7.2e-21
h_-2(1/s)	2.5e-23	1.3e-24	2.7e-27
S_t(s)	9.5e-22	1.7e-22	3.6e-21
S_f(1/s)	4.9e-22	2.6e-23	5.3e-26

编号	文件名	欺骗类型	功率优势/dB	欺骗策略
场景1	clean	无欺骗	—	—
场景2	ds2	授时欺骗	10.0	策略1
场景3	ds3	授时欺骗	1.3	策略2
场景4	ds7	授时欺骗	1.0	策略2

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