Introduction - If you have any usage issues, please Google them yourself
Since the 1990 s, Barrios and the leadership of the admiralty Patterson American research group began to study projecting a complicated environment radio waves propagation characteristics of PE model. Put forward at the same time in Barrios horizontal and vertical direction of atmospheric refractive index to the linear interpolation method Barrios wrote TPEM (Terrain Parabolic Equation Model) program code