The ground penetrating radar(GPR) forward simulation all aims at the singular and regular models, such as sandwich model, round cavity, square cavity, and so on, which are comparably simple. But as to the forward of c...The ground penetrating radar(GPR) forward simulation all aims at the singular and regular models, such as sandwich model, round cavity, square cavity, and so on, which are comparably simple. But as to the forward of curl interface underground or “v” figure complex model, it is difficult to realize. So it is important to forward the complex geoelectricity model. This paper takes two Maxwell’s vorticity equations as departure point, makes use of the principles of Yee’s space grid model theory and the basic principle finite difference time domain method, and deduces a GPR forward system of equation of two dimensional spaces. The Mur super absorbed boundary condition is adopted to solve the super strong reflection on the interceptive boundary when there is the forward simulation. And a self-made program is used to process forward simulation to two typical geoelectricity model.展开更多
针对碳纤维复合材料涂层厚度检测问题,进行了综合性实验设计。提出结合L1范数的谱投影梯度算法(spectral projection gradient based L1,SPGL1)的涂层厚度检测方法,结合涂层测厚实际,明确了基底检测更适合使用反射式太赫兹时域系统。分...针对碳纤维复合材料涂层厚度检测问题,进行了综合性实验设计。提出结合L1范数的谱投影梯度算法(spectral projection gradient based L1,SPGL1)的涂层厚度检测方法,结合涂层测厚实际,明确了基底检测更适合使用反射式太赫兹时域系统。分析求解了凸最优问题需要的条件,给出了信号稀疏分解结合飞行时间法的涂层厚度检测方案。实验数据表明,当涂层折射率相差较大时,加入噪声后的结果与理想情况一致,当涂层折射率相近时,SPGL1方法具有良好的抗干扰能力。该实验基于教师科研成果,通过完整的实验设计能够帮助学生理解时域光谱、稀疏分解、飞行时间法等基本理论和方法,锻炼了学生的实践动手能力和知识综合运用能力,培养了探索热情和创新意识。展开更多
文摘The ground penetrating radar(GPR) forward simulation all aims at the singular and regular models, such as sandwich model, round cavity, square cavity, and so on, which are comparably simple. But as to the forward of curl interface underground or “v” figure complex model, it is difficult to realize. So it is important to forward the complex geoelectricity model. This paper takes two Maxwell’s vorticity equations as departure point, makes use of the principles of Yee’s space grid model theory and the basic principle finite difference time domain method, and deduces a GPR forward system of equation of two dimensional spaces. The Mur super absorbed boundary condition is adopted to solve the super strong reflection on the interceptive boundary when there is the forward simulation. And a self-made program is used to process forward simulation to two typical geoelectricity model.
基金Project supported by China Postdoctoral Science Foundation （20100481488）, Key Fund Project of Advanced Research of the Weapon Equipment （9140A33040512JB3401）.
文摘针对碳纤维复合材料涂层厚度检测问题,进行了综合性实验设计。提出结合L1范数的谱投影梯度算法(spectral projection gradient based L1,SPGL1)的涂层厚度检测方法,结合涂层测厚实际,明确了基底检测更适合使用反射式太赫兹时域系统。分析求解了凸最优问题需要的条件,给出了信号稀疏分解结合飞行时间法的涂层厚度检测方案。实验数据表明,当涂层折射率相差较大时,加入噪声后的结果与理想情况一致,当涂层折射率相近时,SPGL1方法具有良好的抗干扰能力。该实验基于教师科研成果,通过完整的实验设计能够帮助学生理解时域光谱、稀疏分解、飞行时间法等基本理论和方法,锻炼了学生的实践动手能力和知识综合运用能力,培养了探索热情和创新意识。
