CPR Modeling for Mini-RF Data Study on Lunar PSR Region
Searching for water ice in the lunar media has been a key issue in the Moon explorations.Missions of Mini-SAR and Mini-RF SAR made compact-pol(polarization)measurements on lunar polar permanent shadowed region(PSR).High circular polarization ratio(CPR)data and two-layer model were applied to studying if water-ice in PSR could be retrieved.However,it has been studied that high CPR is not simply due to the presence of water-ice.We point out that the Campbell model is a degenerated half-space model,which confused dielectric inversion of Mini-RF data.In this paper,our numerical BART(Bi-directional Analytic Ray Tracing)is applied to simulate high-order scattering from the lunar rough surface with-and without-stone-scatters,the CPR is numerically simulated and analyzed.Furthermore,a two-layer model of KA surface(Kirchhoff-approximation)/SPA subsurface(small perturbation approxi-mation)subsurface is developed to take account of all these topographic factors for PSR dielectric inversion.The Mini-RF data on the PSR of Hermite-A crater in the North pole(see Fig.1)are employed for the inversion.Our results do not support previous conclusions based on the half space model,suggesting that the inversion of Mini-RF are not so straight forward in proving water-ice existence in the PSR media.It points out that double and high-order scattering of random volumetric scatters on the lunar surface can play a certain role,and high-resolution measurements and more elaborate modeling are needed for further studies.
numerical BART for CPR two-layer model PSR dielectric inversion
Ya-Qiu Jin Niutao Liu
Key Lab for Information Science of Electromagnetic Waves Fudan University Shanghai 200433,China
国际会议
杭州
英文
1-1
2018-12-03（万方平台首次上网日期，不代表论文的发表时间）