Anti-spoofing technology based on array antenna signal processing
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摘要: GNSS在国家基础设施以及生命安全应用中扮演重要角色,但日益增长的欺骗干扰事件给GNSS带来了巨大威胁. 本文介绍了基于阵列天线信号处理的防欺骗技术,根据阵列构型的不同,从均匀阵列和稀疏阵列两个方面总结了欺骗干扰检测与欺骗干扰抑制方法. 其中稀疏阵列相较均匀阵列,在相同天线阵元数的情况下,拥有更大的阵列孔径及自由度,极大地降低了设备成本,但其对相干信号处理技术要求更高. 最后本文给出了防欺骗干扰技术面临的难题以及其未来的发展趋势.Abstract: Global navigation satellite systems play an important role in national infrastructure as well as life safety applications, but the increasing spoofing incidents pose a great threat to GNSS. This paper introduces the anti-spoofing technology based on array antenna signal processing, and summarizes the spoofing interference detection and spoofing interference suppression methods from both uniform and sparse arrays according to the different array configurations. Compared with uniform array, sparse array has larger array aperture and degree of freedom under the same number of antenna elements, which greatly reduces the cost of equipment, but its coherent signal processing technology requires more. Finally, this paper gives the difficulties faced by the anti-spoofing interference technology and its future development trend.
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Key words:
- spoofing /
- sparse array /
- direction of arrival estimation /
- subspace projection /
- beamforming
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表 1 GNSS防欺骗技术
项目 信息层 信号层 单天线 阵列天线 辅助传感器 检测 伪距、
伪距残差、
多普勒-钟飘双差等CNR、
载波相位、
相关峰、
矢量接收机等信号强度、
DOA等IMU、
高度计等抑制 信号加密认证 MLE、AGC等 功率倒置、
波束形成、
子空间投影、
空时自适应处理等- 表 2 互质阵列构型
子阵 阵元数 阵元间距 1 $2{M_1}$ ${M_2}d$ 2 ${M_2}$ ${M_1}d$ -
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