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中文摘要：
针对相控阵天线系统常用方法中存在的对相干信源估计效果不好、波束形成受信噪比（SNR）影响较大的问题,提出基于改良多信号分类（MUSIC）和可自适应对角加载的线性约束最小方差（ADL-LCMV）的自适应波束形成算法。该算法首先对阵列接收数据进行共轭重排、构造增广矩阵,进而构造新的特征子空间,进行波达方向的估计,然后在LCMV算法的基础上引入自适应对角加载,形成波束。仿真结果表明：改良MUSIC算法能有效识别来波信号的方向,对相干信号的识别效果较好,优于空间平滑算法;ADL-LCMV算法在形成波束时能有效克服高信噪比下小特征值扰动带来的不良影响。
英文摘要：
In view of the existing phased array antenna has the problems that the effect of estimation of coherent signals is not good,beam forming is influenced by signal-to-noise ratio（SNR）.To solve the problem,an adaptive beam forming algorithm based on modified music and LCMV was proposed in this paper,whose diagonal could be loaded adaptively（ADL-LCMV）.The algorithm firstly conjugated rearrangement and augmented the matrix of receiving data,tectonic feature subspace,estimation of DOA,then introduced the adaptive diagonal loading based on the LCMV algorithm to adapt beam forming.Simulation results indicated that this modified MUSIC algorithm had a higher performance of coherent signals DOA estimation than existing spatial smoothing algorithm,and ADL-LCMV algorithm could effectively overcome the influences of low signal-to-noise ratio.
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