CAJ | 학술논문

指出了水平定向天线阵波束形成的主要难点，没有固定相位中心和受交叉极化来波的影响。阵列受随机性误差使得导向矢量存在较大失配，从而导致传统 Capon算法性能下降甚至失效。在阵列误差模型下，给出了基于协方差矩阵与导向矢量联合修正的稳健 Capon波束形成算法。该算法首先基于收缩得到一个增强的协方差矩阵，然后通过最大化 Capon输出功率实现对导向矢量的修正，同时增加二次型约束防止修正的导向矢量接近于干扰导向矢量上。该算法可转化为二次约束二阶规划问题，并通过凸优化进行求解。仿真结果表明，该算法对天线阵模型中误差矩阵具有一定的稳健性，且较其他稳健算法具有较好的性能。
지출료수평정향천선진파속형성적주요난점，몰유고정상위중심화수교차겁화래파적영향。진렬수수궤성오차사득도향시량존재교대실배，종이도치전통 Capon산법성능하강심지실효。재진렬오차모형하，급출료기우협방차구진여도향시량연합수정적은건 Capon파속형성산법。해산법수선기우수축득도일개증강적협방차구진，연후통과최대화 Capon수출공솔실현대도향시량적수정，동시증가이차형약속방지수정적도향시량접근우간우도향시량상。해산법가전화위이차약속이계규화문제，병통과철우화진행구해。방진결과표명，해산법대천선진모형중오차구진구유일정적은건성，차교기타은건산법구유교호적성능。
The main difficulties of the directional antenna array beamforming are pointed out,that is, there is no fixed phase center and there is influence of cross-polarized wave.The random error causes a large steering vector mismatch,resulting in the traditional Capon algorithm performance degradation or even inva-lidity.A robust Capon beamforming algorithm based on joint estimation covariance and steering vector is proposed under the array error model.It obtains an enhanced covariance matrix based on the shrinkage meth-od firstly,and then achieves steering vector by maximizing the Capon output power,while adding a quadratic constraint to prevent the modified steering vector from closing to the interference.The algorithm can be transformed into the quadratically constrainted quadratic programming(QCQP)problem,which can be solved by convex optimization.Simulation results show that the algorithm has certain robustness for antenna array model error,and has better performance compared with other robust algorithms.