基于双重CSK调相的卫星导航信号认证方法

doi:10.12305/j.issn.1001-506X.2025.08.25

Abstract

Abstract:

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.

Key words: global navigation satellite system （GNSS）, code shift keying （CSK）, signal authentication, phase modulation

CLC Number:

TN 973.3

Xiaohui BA, Bin XIANG, Baigen CAI, Jian WANG, Wei JIANG, Kun LIANG, Linguo CHAI, Shuangna ZHANG. Satellite navigation signal authentication method based on dual CSK phase modulation[J]. Systems Engineering and Electronics, 2025, 47(8): 2676-2685.

Figures/Tables 12

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通道	单重CSK（6,100）	双重CSK（6,100）
通道	单重CSK（6,100）	第一组	第二组
I支路	43.1	42.6	42.9
Q支路	43.1	42.6	42.9
IQ联合	39.8	39.8	40.2

方案	认证码速率/MHz	载噪比衰减/dB	认证速率/bps
传统SCA^[30]	10.23	较高	10
二进制调相方案^[30]	10.23	≈0.03（θ=5°）	10
CSK调相方案^[31]	10.23	≈0.03（θ=5°）	60
双重CSK调相	10.23	≈0.03（θ=5°）	120

扩频码长	U	相关器		基2的FFT
扩频码长	U	乘法	加法	乘法	加法
1023	6	65472	65472	10240	20480
1023	8	261888	261888	10240	20480
10230	6	654720	654720	229376	458752
	8	2618880	2618880	229376	458752
	10	10475520	10475520	229376	458752
	12	41902080	41902080	229376	458752

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Satellite navigation signal authentication method based on dual CSK phase modulation

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