在旁瓣对消系统中，当辅助天线数目大于干扰源数目时，期望信号也被当成一个干扰源而被系统对消掉。一般采用在辅助通道添加阻塞矩阵的方法来解决此问题。然而当期望信号方向与干扰信号方向接近时，采用阻塞矩阵方法会导致合成方向图有较大旁瓣抬升。提出一种新方法，对辅助天线的输出进行线性约束，使辅助天线在期望信号方向形成零陷，从而有效消除辅助通道的期望信号成分，并且具有较好的旁瓣保形能力。通过仿真可以看出，该方法能在保持期望信号方向最大增益的同时，在干扰方向形成非常理想的零陷。%In a sidelobe cancellation system,the desired signal can also be eliminated when the number of auxiliary antennas is larger than the number of interference sources. Generally,this problem can be solved by adding a blocking matrix on the auxiliary channel. However,the sidelobe shows great uplift when the di-rection of the desired signal is closing on the that of the interference signal. To address the issue,a novel method is proposed in this paper,which eliminates the desired signal from the auxiliary antenna by adding a linear constraint on its output. It is observed through simulation that the new method maintains the max gain in the direction of the desired signal while forming an optimal null in the direction of interference.
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