主瓣干扰下的自适应旁瓣对消算法设计

摘要

Compared with adaptive beamforming techniques based on the whole array,the multiple side-lobe canceller (MSLC )has smaller computational load and more robust performance.Conventionally,the MSLC requires that there is no incident signal from the mainlobe direction for the adaptive weight training or otherwise the beam patterns start to degenerate.A novel MSLC design based on the subtraction of subarrays is proposed,which changes the correlation of signals between the main antenna and assistant ones by the linear ar-ray,to avoid the effect of mainlobe signals.Furthermore,two practical implements,the multiple subtraction MSLC and feedback subtraction MSLC are introduced.The simulation results show that the new method is ro-bust and applicable to various situations for interferences suppressing and beam patterns maintaining.%与基于全阵列的自适应波束形成算法相比，旁瓣对消（multiple side lobe canceller，MSLC）技术具有计算量小、性能稳健的优点。一般旁瓣对消系统要求在进行权值调整时，主瓣方向无信号入射，否则系统方向图将发生畸变。提出了基于子阵列数据差分的旁瓣对消系统设计思路，即利用线性阵列性质来改变主辅天线信号相关性，消除主瓣入射信号影响。在此基础上，针对干扰情况的不同，提出了更实用的多级差分旁瓣对消和反馈差分旁瓣对消技术。仿真结果表明，所提算法在不同信号环境下，均能有效抑制旁瓣干扰，同时保持主瓣方向图不发生畸变，具有很好的稳健性。