基于调零技术的GPS抗欺骗干扰研究

发布时间：2018-01-09 19:03

本文关键词：基于调零技术的GPS抗欺骗干扰研究　出处：《电光与控制》2017年01期 　论文类型：期刊论文

【摘要】：目前GPS已经用于许多重要场合,而欺骗攻击可导致其无法正常运行。欺骗干扰对民用GNSS系统造成严重威胁,因此必须提出对欺骗信号进行检测和抑制的方法。首先介绍了一种使用空间滤波(调零)剔除无用信号的方法,并分析了该方法在欺骗条件下的性能;然后研究了对欺骗信号以及噪声信号的抑制,提出了一种采用梯度下降优化阵列权重矢量的方法,仿真表明该优化显著增大了欺骗信号的衰减,随着C/N0的增大,衰减接近-60 d B,而未优化时衰减值只有-30 d B,从而在DOA上限制了信号进入阵列。最后分析了调零技术对卫星真实信号可用性的影响,结果表明,如果卫星在信噪比降低12 d B的情况下还可用的话,则所有卫星都不会受影响。
[Abstract]:At present, GPS has been used in many important occasions, and spoofing attacks can lead to its failure to operate normally. Spoofing interference poses a serious threat to civilian GNSS systems. Therefore, we must put forward a method to detect and suppress the deceptive signal. Firstly, a method of eliminating useless signals by spatial filtering (zeroing) is introduced, and the performance of this method under the condition of deception is analyzed. Then, the suppression of deceptive signal and noise signal is studied, and a gradient descent optimization method is proposed to optimize the array weight vector. The simulation results show that the deceptive signal attenuation is significantly increased by this optimization. With the increase of C / N 0, the attenuation is close to -60 dB, but the attenuation value is only -30 dB without optimization. Finally, the effect of zeroing technology on the availability of satellite real signal is analyzed, and the results show that. All satellites will not be affected if the signal to noise ratio (SNR) is reduced by 12 dB.
【作者单位】：电子科技大学电子科学技术研究院;
【基金】：四川省基础科研计划资助项目(2015JY0084) 国家教育部博士点基金(20120185120034)
【分类号】：TN972;P228.4
【正文快照】： 0引言全球导航卫星系统(GNSS)的各类干扰问题已经研究了十多年,而在各类干扰中欺骗干扰最受关注[1],因为欺骗干扰可以在不引起故障的情况下实施,比较隐蔽,因此,近年来,GNSS欺骗威胁的研究也越来越多[2-4]。最近的研究结果表明,通过发射假信号,很容易使GPS接收机计算出错误的位

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