二维相控阵的自适应—自适应旁瓣对消策略

Adaptive-Adaptive Sidelobe Cancellation Strategy for Two-dimensional Phased Arrays

传统旁瓣对消方法采用单元天线作为辅助通道,系统对消输出的信噪比较低,且合成阵列存在较高的副瓣抬升隐患。针对二维稀疏阵列的应用特点,提出一种新的自适应—自适应旁瓣对消策略。该方法取代了传统方法中使用的单元天线以及数字加权方法,使用小型阵列作为辅助通道和射频加权,并借助辅助通道对干扰方向进行估计,根据估计得到的干扰方向信息对辅助子阵列内部的射频加权系数进行调整,使得辅助通道的波束最大可能地对准干扰方向。最后利用恒增益对消技术,实现主阵列中的旁瓣对消。仿真实验结果表明了该方法的有效性和优势。

The traditional adaptive sidelobe cancellation method uses single antenna as assistant channel,so the signal to noise ratio（ SNR） of system output is small,and it is possible to uplift the sidelobe in synthetic array. In view of application feature of two-dimensional sparse array,a new method named adaptive-adaptive sidelobe cancellation is proposed in this paper. The new method replaces the single antenna with small synthetic arrays as assistant channel and replaces digital weighting method with RF weighting method,and it estimates the direction of the jamming with assistant channel. According to the information about the direction,the new method adjusts the RF weight of assistant channel,and makes the beam of assistant channel align the jamming directions. The sidelobe cancellation method with constant gain is used to perform the sidelobe cancellation. The simulation results prove the effectiveness and advantages of the proposed method.