基于压缩感知的腔体器件电磁特性的快速分析  

Fast Analysis of Electromagnetic Characteristics for Cavity Devices Based on Compressive Sensing

作　　者：齐琦[1] 曹欣远[1] 陈明生[1] 刘艺 况晓静[1] 吴先良[1] Qi Qi;Cao Xinyuan;Chen Mingsheng;Liu Yi;Kuang Xiaojing;Wu Xianliang(Anhui Province Key Laboratory of Simulation and Design for Electronic Information System,Hefei Normal University,Hefei,Anhui 230061,China;School of Computer Science and Technology,Hefei Normal University,Hefei,Anhui 230061,China)

机构地区：[1]合肥师范学院电子信息系统仿真设计安徽省重点实验室,安徽合肥230061 [2]合肥师范学院计算机学院,安徽合肥230061

出　　处：《激光与光电子学进展》2020年第19期184-190,共7页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61701163);安徽省自然科学基金(1908085QF257);安徽省高校自然科学研究项目(KJ2018A0488);电子信息系统仿真设计安徽省重点实验室开放基金(2019ZDSYSZY01)。

摘　　要：为了提高腔体器件电磁特性的计算效率,基于压缩感知理论,提出了一种时域不连续伽略金快速求解方法。该方法采用节点基函数和蛙跳策略对麦克斯韦方程进行时空离散处理,并在电磁场迭代更新的初始阶段,采用传统方法对区域内的所有单元进行循环计算。当电磁波布满整个区域后,将所有单元视为整体进行全域求解。首先,针对全域质量矩阵,按行进行随机抽取以构建欠定方程;其次,将少量的前时间步结果作为先验知识,以构造待求场值的稀疏变换;最后,利用恢复算法求解欠定方程,从而实现腔体器件电磁特性的快速分析。A novel discontinuous Galerkin time domain(DGTD)method based on compressive sensing(CS)is proposed to accelerate the analysis of electromagnetic characteristics of cavity devices.In the method,a nodal basis function and a leapfrog scheme are used for the spatial and time discretization of Maxwell equations.Meanwhile,all elements in the computation domain are updated individually by applying the conventional method at the initial stage for electromagnetic field updating.When the electromagnetic wave covers the whole domain,all elements are updated as a whole and a global solution is conducted.First,the underdetermined equations are established by randomly extracting rows from the global mass matrix.Second,the results after a few previous time steps are taken as the prior knowledge to construct a sparse transform.Finally,the underdetermined equations are solved by the recovery algorithms to realize the fast analysis of electromagnetic characteristics of cavity devices.

关 键 词：激光器 腔体器件 时域不连续伽略金 压缩感知 先验知识 欠定方程 

分 类 号：O441.4[理学—电磁学]