摘要
从麦克斯韦方程组出发 ,建立了矿井地质雷达的时域有限差分法(FDTD)数学模型 ,导出了理想频散关系和超吸收边界条件。理想频散关系能真实地反映雷达波在地下介质中的传播规律 ,压制数值频散现象 :超吸收边界条件能有效减小截断边界的伪反射 ,提高正演精度。将之应用于实际计算 ,取得满意效果。
A finite difference time domain method(FDTD) mathematical model of mine ground penetrating radar (GPR)is established by Maxwell’s equations,and a ideal stability condition and super absorbing boundary condition are proposed in the paper. The ideal stability condition can truly reflected spread law of radar ware in ground medium,and suppress numerical dispersion. The super absorbing boundary condition can decrease the pseudo reflection of truncating boundaries and raiseforward modeling precision. Using the theories in forward modeling,a nicer result is obtained.
出处
《中国煤田地质》
2000年第1期59-62,共4页
Coal Geology of China
关键词
地质雷达
正演
FDTD法
矿井地质勘探
ground penetrating radar
forward modeling
FDTD method
ideal stability condition
super absorbing boundary condition
