新型测量矩阵加速压缩感知目标电磁散射问题研究

Novel Measurement Matrix Accelerated Compressive Sensing for Electromagnetic Scattering Problems of Target

  • 摘要: 为有效抽取阻抗矩阵中关键信息构造测量矩阵, 提出一种基于自适应交叉近似(ACA)算法的新型测量矩阵构造方法。将目标进行子域划分, 每个子域找出与之耦合性最弱的子域并进行标记; 对标记子域间的互阻抗矩阵应用ACA算法进行压缩, 利用该过程中产生的行索引抽取原阻抗矩阵对应的行, 得到测量矩阵。与传统方法相比, 新方法构造的测量矩阵维数更低, 计算效率显著提高, 数值结果证明了该方法的有效性。

     

    Abstract: Measurement matrix construction is the key part of the moment of methods based on compressive sensing, and the measurement matrix constructed by random or uniform extraction will lack the important information in the impedance matrix, as well as the obtained measurement matrix is large in dimension and inefficient in solving. In order to effectively extract the key information in the impedance matrix to construct the measurement matrix, a novel measurement matrix construction method based on adaptive cross approximation (ACA) algorithm is proposed. First, the target is divided into blocks, and the weakest coupling with each block is identified and marked; then, the ACA algorithm is applied to compress the mutual impedance matrix between the marked blocks, and the row indexes generated in the process are used to extract the corresponding rows of the original impedance matrix to obtain the measurement matrix. Compared with the traditional method, the measurement matrix constructed by the new method is lower in dimension, and the calculation efficiency is significantly improved. Numerical results demonstrate the effectiveness of the new method.

     

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