Volume 44 Issue 3
Jun.  2024
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Article Navigation >  Chinese Journal of Space Science  > 2024  >  44(3): 525-535 Open Access
CHEN Shurui, FENG Yongjiu, TONG Xiaohua, TANG Panli, XU Xiong, WANG Chao, LIU Sicong, YANG Qiquan, XIAO Changjiang. Numerical Validation of Subsurface Dielectric Property Estimation Based on Full Waveform Inversion at Chang’E-4 Landing Site (in Chinese). Chinese Journal of Space Science, 2024, 44(3): 525-535 doi: 10.11728/cjss2024.03.2023-0115
Citation: CHEN Shurui, FENG Yongjiu, TONG Xiaohua, TANG Panli, XU Xiong, WANG Chao, LIU Sicong, YANG Qiquan, XIAO Changjiang. Numerical Validation of Subsurface Dielectric Property Estimation Based on Full Waveform Inversion at Chang’E-4 Landing Site (in Chinese). Chinese Journal of Space Science, 2024, 44(3): 525-535 doi: 10.11728/cjss2024.03.2023-0115
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Numerical Validation of Subsurface Dielectric Property Estimation Based on Full Waveform Inversion at Chang’E-4 Landing Site

doi: 10.11728/cjss2024.03.2023-0115 cstr: 32142.14.cjss2024.03.2023-0115

  • College of Surveying and Geo-Informatics, Tongji University, Shanghai 200092

  • Shanghai Key Laboratory of Space Mapping and Remote Sensing for Planetary Exploration, Shanghai 200092

  • Received Date: 2023-10-19
  • Accepted Date: 2024-05-13
  • Rev Recd Date: 2023-11-20
    • Available Online: 2024-01-02
    Abstract
  • Dielectric property is an important parameter that determines the propagation speed of radar wave in materials, which is widely used in stratigraphic division, regolith thickness inversion, radar model construction and water-ice detection. However, continuous impacts may cover the traces of important geological activities and hinder the exploration of lunar geological. In January 2019, China’s Chang’E-4 carried the Yutu-2 rover successfully landed at the Von Kármán crater (177.5991°E, 45.4446°S) in the South Pole-Aitken (SPA) basin. The Yutu-2 rover equipped with dual-frequency ground penetrating radar (Lunar Penetrating Radar, LPR). The subsurface radar diagram with fine vertical resolution provided by the Chang’E-4 LPR can deepen our understanding of the dielectric property of lunar subsurface materials. Full Waveform Inversion (FWI) method can fully utilize the kinematic and dynamic information of radar wave field and invert the dielectric property by constructing an initial dielectric model and continuously updating this model with comparison of the observed radar data. By comparing the simulation results of homogeneous dielectric model and stochastic equivalent media model to the Chang’E-4 LPR diagram, we selected the stochastic equivalent media model as the real model to simulate the subsurface dielectric profile at the Chang’E-4 landing site and valid the dielectric accuracy inversed by FWI method. Our results reported that FWI method can not only capture the dielectric perturbation in local scale, but also generate two-dimensional dielectric profile with high spatial resolution. The initial dielectric model is able to better characterize the dielectric properties after 79 FWI iterations, and the maximum inversion error of relative dielectric constant is limited to 0.2 (the objective function is minimized to 0.91% of the initial value). The stochastic equivalent medium model can effectively simulate the dielectric properties of the lunar regolith, and the radar simulation results based on it are close to the Chang’E-4 LPR radar diagram.

     

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