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线性约束和协方差矩阵重构的主瓣干扰抑制算法研究
发表时间：2016-05-31 浏览量：2133 下载量：692
| 全部作者： | 廖艳苹，卢刘健 |
| 作者单位： | 哈尔滨工程大学信息与通信工程学院 |
| 摘 要： | 在特征投影和协方差矩阵重构主瓣干扰抑制（eigen-projection and covariance matrix reconstruction，EP-CMR）算法的基础上提出线性约束和协方差矩阵重构主瓣干扰抑制（linear constraints and covariance matrix reconstruction，LC-CMR）算法。该算法首先利用重构后的协方差矩阵来计算自适应权矢量和重构回波数据；然后构造线性约束条件实现旁瓣干扰方向的准确置零，并利用最小二乘拟合算法修正自适应权矢量，使其满足约束条件；最后利用修正的自适应权矢量来处理重构后的回波数据获得输出。仿真结果表明，当主瓣干扰功率较高时，所提算法在有效抑制主瓣干扰的同时，能够保证旁瓣干扰信号方向具有较深的零陷，提高了系统的输出信干噪比（signal to interference plus noise ratio, SINR）。 |
| 关 键 词： | 信号处理；自适应波速形成；主瓣干扰；旁瓣干扰；协方差矩阵重构；线性约束 |
| Title： | Study on mainlobe interference suppression algorithm based on linear constraints and covariance matrix reconstruction |
| Author： | LIAO Yanping, LU Liujian |
| Organization： | College of Information and Communication Engineering, Harbin Engineering University |
| Abstract： | In accordance with the eigen-projection and covariance matrix reconstruction (EP-CMR), an improved algorithm based on linear constraints and covariance matrix reconstruction (LC-CMR) is proposed in this paper. Firstly, the adaptive weight vector and reconstructed echo data can be obtained by the reconstructed covariance matrix; Secondly, the liner constraints is used to certify beam pattern nulling in the sidelobe interference direction, and the least square fitting algorithm is used to modify the adaptive weight vector, which makes the modified weight vector satisfy the linear constraints; Thirdly, the output of the adaptive beamforming can be calculated by the modified weight vector and processed echo data. Simulation results have shown that the proposed algorithm in this paper can ensure the deeper null steering in the sidelobe interference direction while effectively suppressing the mainlobe interference, and thus raise the output signal to interference plus noise ratio (SINR) of the system in the case of the higher power of the mainlobe interference. |
| Key words： | signal processing; adaptive beamforming; mainlobe interference; sidelobe interference; covariance matrix reconstruction; linear constraints |
| 发表期数： | 2016年5月第10期 |
| 引用格式： | 廖艳苹，卢刘健. 线性约束和协方差矩阵重构的主瓣干扰抑制算法研究[J]. 中国科技论文在线精品论文，2016，9（10）：1055-1062. |
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