Abstract:

Due to so few of landing site on the moon, the ground truth data of lunar soil is scarce, which limits the further study of the lunar science. Thus to carry out spectral simulation of lunar regolith is almost the only feasible way to research the spectral mechanism of lunar regolith and improve the reliability of composition inversion of lunar regolith, which also is essential and beneficial supplement to the measured spectra of lunar regolith. We selected plagioclase, clinopyroxene, orthopyroxene, olivine, metallic iron, ilmenite, volcanic glass and agglutinate acquired from RELAB spectral library as mineral endmembers, and simulated spectra of LSCC lunar regolith based on Hapke radiative transfer model, using Newton interpolation and least square optimization method. The simulated spectra and the measured spectra fits well with the correlation coefficients more than 0.99 and the root mean square error at the magnitude of 10-3. The simulated mineral abundance shows a good linear fitting with the measured abundance. The simulated SMFe content has a distinct linear relationship with the relative maturity index Is/FeO. The simulated particle size strictly falls within the measured particle size range. The simulation accuracy of spectral parameters, such as absorption center wavelength and absorption area, was discussed. We also discussed the calculation method of optical constants used for spectra simulation with high precision.

Key words: Hapke model, lunar soil, spectra simulation, optical constants