Two-Dimensional Euler Adaptive Mesh Method on Detonation

The adaptive mesh refinement （AMR） method is applied in the 2-D Euler multi-component elasticplastic hydrodynamics code （MEPH2Y）. It is applied on detonation. Firstly, the AMR method is described, including a conservative spatial interpolation, the time integration methodology with the adapitve time increment and an adaptive computational region method. The advantage of AMR technique is exhibited by numerical examples, including the 1-D C-J detonation and the 2-D implosion ignited from a single point. Results show that AMR can promote the computational efficiency, keeping the accuracy in interesting regions.

一种基于自适应权重SAD与Census融合的匹配算法

立体匹配算法中的SAD算法与Census算法较为常用,本文分析了两种算法的特点,在改进SAD算法后,将其与Census算法融合,提出了自适应权重的SAD-Census算法。试验表明,与SAD算法和Census算法相比,该算法匹配效果更好,对实际场景拍摄图像的匹配也有较好的稳健性。

基于2D-LMS的探地雷达背景噪声去除

铁路建设中常需在铁路两侧构筑挡土墙对铁轨进行保护,因此挡土墙施工质量对铁路具有重要意义。为了获得更有效的挡土墙质检数据,常用探地雷达(ground penetrating radar,GPR)进行质检。结合理论分析了电磁波在地下非均匀介质边界的反射和衍射特性,结果表明回波噪声呈二维分布。对仿真回波二维加噪后,对比二维中值和一维自适应(1D-LMS)算法滤波效果,仿真结果表明二维处理明显优于一维。为适应GPR回波信号的非线性特征,选取二维自适应(2D-LMS)算法对回波信号进行处理,并与二维中值滤波相比较。广东省某铁路挡土墙实测数据处理结果表明,2D-LMS算法滤波信号具有更高信噪比,能更有效地去除噪声,使回波图像更加清晰。