The Subsurface Structure on the CE-3 Landing Site: LPR CH-1 Data Processing by Shearlet Transform
The Lunar penetrating radar (LPR) carried by Chang’E-3 (CE-3) mission is an important application of radar in lunar exploration. An opportunity of significance to detect the information of regolith and the subsurface structure on the landing site is offered by LPR aboard the Yutu rover. On the basis of a data processing flow, a low-frequency radar image has been available for mapping subsurface structure. The noise interfered data give a huge challenge for geological stratification and interpretation. To solve the limitation imposed by noise, we adopt the shearlet transform as a promising tool for data analysis and noise attenuation. The different distributions of the noise and signal in the shearlet domain decrease the difficulty of noise attenuation. To optimize the denosing strategy, we replace a local adaptive thresholding function with the conventional hard threshold. The quality of the processed data is improved, which is helpful for geological stratification and interpretation. Finally, by combining these data with the regional geology and previous research, especially the LPR data, we can provide an interpretation of the LPR CH-1.
KeywordsLunar penetrating radar subsurface structure data processing denoising simulation
We thank the open-source data in http://moon.bao.ac.cn. Data are hosted by National Astronomical Observatories, Chinese Academy of Sciences.
LZ contributed to acquiring the data, interpreting the results, and writing the manuscript; BH contributed to evaluating the manuscript and checking the results; ZJ contributed to providing the idea of the proposed method, analyzing the data and outlining the manuscript; YX contributed to providing funding support and revising the article.
This work was supported by the Science and Technology Development Fund (FDCT) of Macau (Grant no. 0089/2018/A3, 121/2017/A3, 2018/2018/A2) and the National Natural Science Foundation of China (41574109).
Compliance with Ethical Standards
Conflict of interest
All authors declare that they have no competing interest.
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