稀疏天线阵的时间反转窗函数方法
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摘要
在基于时间反转算子实现对远场目标聚焦的方法中,当天线阵列为稀疏阵时,由于栅瓣的存在,导致了无法分辨目标方向的问题。因此本文提出一种识别主瓣的方法来确定目标方向,从而使采用时间反转对远场目标实现聚焦时不再受到天线阵列形式的限制。这种方法利用主瓣在不同频率上的角度的不变性和栅瓣角度随着频率的改变而发生改变的性质,将方向图视为在角度上的窗函数,通过将不同频率的方向图相乘来识别主瓣的方向。最后通过仿真实验验证了电磁平面波情况下对天线阵主瓣识别的准确性和有效性。
The method based on time-reversal theory can't focus far-field goals when the grating lobe presence. Therefore, we propose a method to distinguish the main lobe. This method makes the use of time reversal no longer limited by the antenna array form when focusing on far-field objects. This method uses the invariance of the direction of main lobe on the different frequency and the nature of the grating lobe angle changes with frequency change. It regards the directional pattern as a window function at the angle, and identifies the direction of the main lobe by multiplying the directional patterns of different frequencies. Finally, the simulation experiments verify the accuracy and effectiveness of the recognition of the main lobe of the antenna array in the case of electromagnetic plane wave.
The method based on time-reversal theory can't focus far-field goals when the grating lobe presence. Therefore, we propose a method to distinguish the main lobe. This method makes the use of time reversal no longer limited by the antenna array form when focusing on far-field objects. This method uses the invariance of the direction of main lobe on the different frequency and the nature of the grating lobe angle changes with frequency change. It regards the directional pattern as a window function at the angle, and identifies the direction of the main lobe by multiplying the directional patterns of different frequencies. Finally, the simulation experiments verify the accuracy and effectiveness of the recognition of the main lobe of the antenna array in the case of electromagnetic plane wave.
引文
[1]FinkM,PradaC,WuF,etal.Selffocusingin inhomogeneousmediawithtimereversalacoustic mirrors[C]//Ultrasonics Symposium, 1989. Proceedings.IEEE. IEEE, 1989:681-686 vol.2.
[2]李元奇.基于时间反转的雷达目标成像方法研究[D].电子科技大学,2017.
[3]付永庆,刘伟.基于时间反转算子分解的选择性聚焦方法[J].吉林大学学报(工), 2015, 45(5):1731-1736.
[2]李元奇.基于时间反转的雷达目标成像方法研究[D].电子科技大学,2017.
[3]付永庆,刘伟.基于时间反转算子分解的选择性聚焦方法[J].吉林大学学报(工), 2015, 45(5):1731-1736.