Abstract:

Lunar Penetrating Radar equipped on the rover of CE-3 can observe the shallow structure of lunar surface on acrosssectional observational style and detect 30 meters soil layer structure under the lunar by the antenna of 500 MHz. In order to analyze the exploration results of lunar penetrating radar better,this paper builds forward modelling using ground penetrating radar technology in order to study the lunar regolith layer; we adopted the electrical parameter of Apollo 15 which is nearest to the landing position of CE3 as the dielectric constant of rock layer; the dielectric constant of the lunar regolith is a value related to density and varied with depth.To establish the model according to the above parameters, based on the finite difference time domain (FDTD) principle, the lunar regolith layer was simulated by the GprMax, and the established model included the model of the surface dielectric constant change with depth and waterice distribution simulation inside the lunar soil, aiming for finding the general rules of the lunar regolith layer and the thickness of the waterice. We have analyzed the wave features of radar reflectance wave, which can provide the theoretical basis for future moon probe program.

Key words: GprMax, FDTD, forward modelling, radar wave, dielectric constant