Simultaneous observation of lunar radar sounder and laser altimeter of kaguya for lunar regolith layer thickness estimate

Takao Kobayashi, Jung Ho Kim, Seung Ryeol Lee, Hiroshi Araki, Takayuki Ono

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Simultaneous observations of Lunar Radar Sounder (LRS) and Laser ALTimeter (LALT) of Kaguya, a Japanese lunar exploration project, were carried out for the purpose of mapping regolith layer thickness of the Moon. Nadir surface echo of a high-frequency (5 MHz) pulse of LRS interferes the shallow (< 10 m) subsurface echo from the bottom of the regolith layer, which subsequently makes the apparent surface be detected at a range deviated from the actual surface range, while the actual surface range is optically detected by LALT. Regolith layer thickness information is retrieved from this range difference after an inversion process. So far, four major maria on the near side of the Moon (Maria Tranquillitatis, Serenitatis, Imbrium, and Oceanus Procellarum) have been investigated, and the mean regolith layer thicknesses of the four maria were found to be about the same, ranging from 6.3 to 6.9 m. However, spatial distribution of areal regolith thickness appears different in eastern maria from western maria, which implies a difference of the growth history of the regolith layer.

Original languageEnglish
Article number5411790
Pages (from-to)435-439
Number of pages5
JournalIEEE Geoscience and Remote Sensing Letters
Volume7
Issue number3
DOIs
Publication statusPublished - 2010 Jul 1

Keywords

  • Kaguya
  • Laser ALTimeter (LALT)
  • Lunar Radar Sounder (LRS)
  • regolith

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Electrical and Electronic Engineering

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