实现超宽带信号在自由空间，室内的传播过程，该过程通过FDTD技术来实现。-Through FDTD technology,we simulate the process that UWB signal transmits in freespace

室内定位信号传播模型的对比，比较各模型在拟合信号传播过程的优劣。已验证，很实用。-Indoor positioning signal propagation model, the model of the pros and cons and the degree of fitting contrast. Verified, very useful.