针对基于多散射中心模型回波的一维距离像(High Resolution Range Profile,HRRP)难以真实反映复杂目标散射特性的问题,研究了基于电磁散射模型回波的生成方法和HRRP宽带特征提取方法。首先应用等效电磁流法(Method of Equivalent Curren...针对基于多散射中心模型回波的一维距离像(High Resolution Range Profile,HRRP)难以真实反映复杂目标散射特性的问题,研究了基于电磁散射模型回波的生成方法和HRRP宽带特征提取方法。首先应用等效电磁流法(Method of Equivalent Currents,MEC)棱边修正的物理光学(Physical Optics,PO)算法解算飞机目标动静态电磁散射特性;其次基于目标散射场数据,生成目标回波、仿真HRRP序列,提取目标宽带特征信息;最后求解了目标在设定航迹下的平均识别率,量化分析了信噪比对目标识别率的影响。理论分析与仿真结果表明:当信噪比(Signal-to-Noise Ratio,SNR)大于5 dB时,基于电磁散射建模的平均识别率相对基于传统的多散射中心模型提升了20%。展开更多
Circularly polarized （CP） lens antenna has been applied to numerous wireless communication systems based on its unique advantages such as high antenna gain, low manufacturing cost, especially stable data transmissio...Circularly polarized （CP） lens antenna has been applied to numerous wireless communication systems based on its unique advantages such as high antenna gain, low manufacturing cost, especially stable data transmission between the transmitter and the receiver. Unfortunately, current available CP lens antennas mostly suffer from high profile, low aperture efficiency as well as complex design. In this paper, we propose an ultra-thin CP lens antenna based on the designed single- layered Pancharatnam-Berry （PB） transparent metasurface with focusing property. The PB metasurface exhibits a high transmissivity, which ensures a high efficiency of the focusing property. Launched the metasurface with a CP patch antenna at its focal point, a low-profile lens antenna is simulated and measured. The experimental results show that our lens antenna exhibits a series of advantages including high radiation gain of 20.7 dB, aperture efficiency better than 41.3%, and also narrow half power beam width （HPBW） of 13°at about 14GHz. Our finding opens a door to realize ultra-thin transparent metasurface with other functionalities or at other working frequencies.展开更多
文摘针对基于多散射中心模型回波的一维距离像(High Resolution Range Profile,HRRP)难以真实反映复杂目标散射特性的问题,研究了基于电磁散射模型回波的生成方法和HRRP宽带特征提取方法。首先应用等效电磁流法(Method of Equivalent Currents,MEC)棱边修正的物理光学(Physical Optics,PO)算法解算飞机目标动静态电磁散射特性;其次基于目标散射场数据,生成目标回波、仿真HRRP序列,提取目标宽带特征信息;最后求解了目标在设定航迹下的平均识别率,量化分析了信噪比对目标识别率的影响。理论分析与仿真结果表明:当信噪比(Signal-to-Noise Ratio,SNR)大于5 dB时,基于电磁散射建模的平均识别率相对基于传统的多散射中心模型提升了20%。
基金Project supported by the National Natural Science Foundation of China(Grant No.61372034)
文摘Circularly polarized （CP） lens antenna has been applied to numerous wireless communication systems based on its unique advantages such as high antenna gain, low manufacturing cost, especially stable data transmission between the transmitter and the receiver. Unfortunately, current available CP lens antennas mostly suffer from high profile, low aperture efficiency as well as complex design. In this paper, we propose an ultra-thin CP lens antenna based on the designed single- layered Pancharatnam-Berry （PB） transparent metasurface with focusing property. The PB metasurface exhibits a high transmissivity, which ensures a high efficiency of the focusing property. Launched the metasurface with a CP patch antenna at its focal point, a low-profile lens antenna is simulated and measured. The experimental results show that our lens antenna exhibits a series of advantages including high radiation gain of 20.7 dB, aperture efficiency better than 41.3%, and also narrow half power beam width （HPBW） of 13°at about 14GHz. Our finding opens a door to realize ultra-thin transparent metasurface with other functionalities or at other working frequencies.
