Parameter Inversions of Multi-Layer Media of Mars Polar Region with Validation of SHARAD Data

• 作者: Chuan Liu Ya-Qiu Jin
• 来源期刊: 天文学与天体物理学国际期刊(英文)
• 学科: 医学
• 关键词: RADAR Sounder INVERSION of MULTI-LAYER Parameters STRATIFIED Media MARS POLAR Region SHARAD
• 年，卷（期）: 2019,（3）
• 页码范围: 335-353
• 页数: 19页
• 分类号: R73

摘要

HF (high frequency) radar sounder technology has been developed for several missions of Mars surface/subsurface exploration. This paper presents a model of rough surface and stratified sub-surfaces to describe the multi-layer structure of Mars polar deposits. Based on numerical simulation of radar echoes from rough surface/stratified interfaces, an inversion approach is developed to obtain the parameters of Polar Layered Deposits, i.e. layers thickness and dielectric constants. As a validation example, the SHARAD radar sounder data of the Promethei Lingula of Mars South Polar region is adopted for parameters inversion. The result of stratification is also analyzed and compared with the optical photo of the deep cliff of Chasma Australe canyon. Dielectric inversions show that the deposit media are not uniform, and the dielectric constants of the Promethei Lingula surfaces are large, and become reduced around the depth of 20 m - 30 m, below where most of the deposits are nearly pure ice, except a few thin layers with a lot of dust.