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Radar Active Deception Jamming Recognition Method Based on the Time-varying Polarization-conversion Metasurface
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摘要: 聚焦雷达对抗中极化信息获取与利用的应用需求，该文研究了基于极化时变调控表面的有源欺骗干扰辨识方法。首先，设计了一套在9.6～10.1 GHz频带内支持3 bit相位量化的各向异性相位调制表面，通过优化相位调制编码序列，实现了极化态按需调控。然后，将极化调控表面加装在单极化雷达天线上，使天线发射和接收电磁波的极化态沿特定极化轨道变化，通过提取目标与有源欺骗干扰的极化域差异，实现两者辨识。仿真分析表明，在3种不同的极化轨道约束下，干扰与目标均具有显著的聚类效应，可获得稳定的干扰辨识效果。相较于依赖双极化或全极化雷达体制的干扰辨识方法，该文所提方法兼具低成本与高效性，在雷达抗干扰中具有很大的应用潜力。Abstract: In this study, aiming at fulfilling the requirement of polarization acquisition and utilization, a method for active deception jamming recognition based on the time-varying polarization-conversion metasurface is investigated. First, an anisotropic phase-modulated metasurface supporting 3-bit phase quantization in the 9.6～10.1 GHz frequency band is designed. By optimizing the periodical phase coding, the polarization state can be converted on demand. And then, loading the polarization-conversion metasurface on a single polarization radar antenna so that the polarization states of the antenna can change along a specific trajectory. By extracting the difference in the polarization domain between target and active deception jamming, the active deception jamming could be distinguished from the radar echo. The simulation results show that under the constraints of three different polarization trajectories, the active deception jamming and targets exhibit a significant clustering effect, and the identification effect is stable. Compared with jamming identification methods that rely on dual-polarization or full-polarization radar systems, the proposed method has both low cost and high efficiency, which has great application potential in radar anti-jamming.
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图 1 基于相位调制编码的极化时变调控超表面及极化调控原理示意图
Figure 1. Schematic diagram of time-varying polarization-converting metasurface based on phase-modulated coding and its mechanism of polarization modulation
图 2 不同相位量化位数及编码序列长度下，等效反射系数幅/相分布图
Figure 2. The amplitude-ratio and phase-difference distribution of the effective reflection coefficients with different coding bits and coding lengths
图 3 各向异性相位调制表面单元的三维拓扑结构图及详细几何参数
Figure 3. 3D topology expanded view of the anisotropy phase-modulated metasurface unit cell with the detailed geometricparameters
图 4 相位调制表面各极化通道反射特性仿真分析
Figure 4. Simultated reflection characteristics of each polarization channel of the phase-modulated metasurface
图 5 不同角度入射波照射下相位调制表面反射相位稳定性分析
Figure 5. Phase stability analysis of the metasurface for different incidence angles
图 6 两种特定极化态对应的相位调制编码序列及偏置电压编码序列(入射波为45°线极化)
Figure 6. Coding sequence for the specific polarization states (with 45° linear polarization incidence)
图 7 基于极化时变调控方法调控得到的3条极化轨道在Poincaré球上的分布
Figure 7. The distribution of three polarization trajectories on Poincaré sphere generated by the method proposed in this paper
图 8 “大圆”轨道约束下的有源欺骗干扰与目标回波的极化域特征分布
Figure 8. Polarization domain characteristics of the target signal and the active detection jamming under the constraint of “great circle” trajectory
图 9 “8”字轨道(过南北极)约束下的有源欺骗干扰与目标回波的极化域特征分布
Figure 9. Polarization domain characteristics of the target signal and the active detection jamming under the constraint of “8” likely trajectory through north and south poles
图 10 “8”字轨道(未过南北极)约束下的有源欺骗干扰与目标回波的极化域特征分布
Figure 10. Polarization domain characteristics of the target signal and the active detection jamming under the constraint of “8” likely trajectory without north and south poles
表 1 3 bit量化相位及偏置电压对应关系
Table 1. Corresponding relationship between 3 bit quantization phase and bias voltage
水平极化 垂直极化 VDC (V) $ \Delta \varphi $ (°) VDC (V) $ \Delta \varphi $ (°) 0 0 0 0 2.6 45 2.7 45 3.2 89 3.5 90 3.5 135 4.5 135 3.9 180 4.6 179 4.5 226 5.1 225 6.0 270 7.0 270 14.0 315 15.0 314 
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