利用shearlet变换对探月雷达数据进行月壤结构的重建  

Reconstruction of regolith structure from lunar penetrating radar channel 2 data based on shearlet transform

作　　者：张领 刘财[1] 胡斌[1] 张泽强 徐晨阳 曾昭发[1] 王德利[1] 徐懿[2] ZHANG Ling;LIU Cai;HU Bin;ZHANG ZeQiang;XU ChenYang;ZENG ZhaoFa;WANG DeLi;XU Yi(College of Geo-exploration Science and Technology,Jilin University,Changchun 130026,China;Lunar and Planetary Science Laboratory,Macao University of Science and Technology,Macao 999078,China;China Water Northeastern Investigation,Design&Research Co.,Ltd.,Changchun 130061,China)

机构地区：[1]吉林大学地球探测科学与技术学院,长春130026 [2]澳门科技大学月球与行星科学国家重点实验室,澳门999078 [3]中水东北勘测设计研究院有限责任公司,长春130061

出　　处：《地球物理学报》2021年第8期2888-2899,共12页Chinese Journal of Geophysics

基　　金：国家自然科学基金项目(41874134,41574109);中国博士后科学基金博士后创新性人才支持计划项目(BX20200148);中国博士后科学基金资助项目(2020M681041)联合资助.

摘　　要：探月雷达作为嫦娥三号和嫦娥四号月球探测任务中最重要的科学载荷之一,其目标是探测月壤及地下结构信息.然而,嫦娥三号探月雷达的第二通道数据受到横向杂波的干扰,使得有用的反射信息被掩盖.这些杂波可以认为是影响数据质量的横向噪声,使得探月雷达数据信噪比低,影响数据解释.本文将利用shearlet变换对探月雷达数据进行信号分析与噪声去除,并对嫦娥三号着陆区的月壤结构进行重建.首先,在shearlet域中,观察横向噪声的分布,并分离出以噪声为主的shearlet分量,并得到重建后的雷达数据.随后,为充分利用嫦娥三号第二通道两套数据的整体优势,对两套经过shearlet变换去噪后的雷达数据进行融合,得到综合探月雷达图像,有效得去除了水平噪声并增强了来自浅月表的有效信号.最后,根据探月雷达处理结果对嫦娥三号着陆点的月壤结构进行重建,重建结构中的溅射物厚度与撞击坑溅射物经验公式结果得到了相互印证.As a radar method for in-site detection,the Lunar Penetrating Radar(LPR)is onboard Chang′E-3(CE-3)and Chang′E-4(CE-4)for probing the structure of lunar regolith.Since the LPR Channel 2 data is muddled with a kind of horizontal clutter signal,we apply multi-scale geometric analysis(shearlet transform)in signal analysis and clutter signal attenuation for LPR Channel 2 data.Firstly,we observe the distribution of horizontal clutter signal in the shearlet domain and pick the noise-dominated sub-domain.Then we remove the local horizontal components in these sub-domain signals in shearlet domain.After removing the horizontal clutter signal,the interference by horizontal clutter signal is highlighted.The processed LPR Channel 2 data—as a new reference—aid geological stratification and interpretation.Finally,according to the LPR result,the geological stratification and interpretation of regolith on the CE-3 landing site is revealed,and the thickness of the ejecta in the reconstructed structure is consistent with the result of the empirical formula for crater ejecta.

关 键 词：探月雷达 月壤结构 SHEARLET变换 图像融合 去噪 

分 类 号：P631[天文地球—地质矿产勘探]