摘要
基于期望信号波达方向信息的自适应波束合成算法对角度误差非常敏感,特别是在期望信号功率较大情况下,产生"自零陷"而导致算法失效。基于恒模特性的盲自适应波束合成在干扰信号功率大于期望信号功率时,算法也会把期望信号抑制以捕获干扰信号。在期望信号波达方向信息已知情况下,采用最小二乘恒模自适应波束合成算法,可以克服上述问题,使得期望信号在大动态时也能正常实现对干扰信号的抑制。本文阐述了算法实现步骤,并通过线阵模型进行仿真验证,证明算法的正确性。
The performance of the adaptive beamforming is vulnerable to the DOA mismatch, especially in the case that the power of the desired signal is large enough compared with the interference. This phe- nomenon is called ＂self-nulling＂. In addition, the desired signal is mitigated and the beamformer catches the interference whose power is larger when the blind beamforming algorithm is employed based on the constant module property. A new heamforming algorithm is presented so that beamformer could work well even if the dynamic range of the interest signal is considerably large. In the new deployment, the DOA information and constant module property of the desired signal are both used. The implementation of the proposed algorithm is presented and the array gain is analyzed. Simulation results show that the main iobe of the array antenna is steered to the desired signal and the interferences are suppressed in the the assumed condition.
出处
《数据采集与处理》
CSCD
北大核心
2015年第3期537-543,共7页
Journal of Data Acquisition and Processing
基金
重庆市自然科学基金(cstc2013jjB40005)资助项目
中央高校基金(CDJZR12165501)资助项目
关键词
波束合成
恒模
波达方向
大动态
beamforming
constant module direction of arrival（DOA）
large dynamic range
