Dielectric Constant of Lunar Soil Derived from Cgang' E-2 Passive Microwave Radiometer Measurements

Lian Yi; Chen Shengbo; Meng Zhiguo; Zhang Feng; Zhang Ying

doi:10.3799/dqkx.2014.158

Abstract：Dielectric constant of lunar soil is the basis of lunar microwave remote sensing detection and it is an indispensable parameter for information extraction of lunar regolith layer thickness and composition.With the aim to simulate dielectric constant for the whole moon, the correction of time angle on brightness temperature data captured by microwave radiometer on board of Chang’ E-2 is carried out in the paper and the distribution map of the whole lunar surface microwave brightness temper-ature under the same time angle with various lunar terrains is obtained, soil compositions and latitudes is obtained.By applying the radiative transfer model to the corrected microwave temperature brightness, the distribution of dielectric constants for 3 GHz channel in the whole moon is obtained.The real part of dielectric constant in the lunar mare region is higher than that in highland and this value is low in polar region.The imaginary part in lunar mare and Aitken basin are relatively higher.The die-lectric constant data have been calibrated in the experiment to obtain dielectric constant temperature at 22℃.To compare the electric constant of real lunar soil samplings under normal temperature on Earth with inversed results, the results show as fol-lows:the relative error of the real part of dielectric constant is less than 1 1%;the relative error of the imaginary part of dielec-tric constant is higher, but the maximum difference is below 0.02.So it is feasible to derive the dielectric constant inversion in the manner of utilizing brightness temperature data of microwave radiometer on board of Chang’ E-2.