基于非线性频偏的频控阵点状波束形成

Dot-shaped Beam Forming Based on Non-linear Frequency Offset of Frequency Diverse Array

针对频控阵波束图存在角度距离耦合的问题,提出了基于非线性频偏的频控阵点状波束形成方法。该方法通过在各阵元间分别引入呈log函数分布、sin函数分布、平方分布和倒数分布4种非线性频偏实现。仿真结果表明,4种方案均能在目标位置处形成点状波束,消除了波束图距离与角度之间的耦合。采用单阵元发射多频信号方法解决非线性频偏引入带来的旁瓣增益高的问题,该方法改善了波束形状,有效降低了旁瓣增益。

Aiming at the problem of angular distance coupling in frequency diverse array(FDA)beampattern,a dot-shaped beam forming method based on non-linear frequency offset of FDA was proposed.The method was realized by introducing 4 nonlinear frequency offset,which were the log function distribution,the sin function distribution,the square distribution and the reciprocal distribution between the array elements.The simulation results showed that the 4 schemes could all form the spot beam at the target position,and eliminate the coupling between the distance and the angle of the beampattern.A single array element transmission multi frequency signal method was adopted to solve the problem of high sidelobe gain caused by nonlinear frequency offset.The simulation results showed that the method improved the shape of the beam and reduces the sidelobe gain effectively.