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Featured researches published by Sho Sasaki.


IEEE Transactions on Aerospace and Electronic Systems | 2011

Effect of Phase Pattern of Antennas Onboard Flying Spin Satellites on Doppler Measurements

Qinghui Liu; Koji Matsumoto; Takahiro Iwata; Noriyuki Namiki; Hirotomo Noda; Hideo Hanada; Yoshiaki Ishihara; Sander Goossens; Fuyuhiko Kikuchi; Kazuyoshi Asari; Seiitsu Tsuruta; Toshiaki Ishikawa; Sho Sasaki; Tadashi Takano

The effect of the phase patterns of antennas onboard flying spin satellites on the Doppler measurements is reported. Phase patterns mean that there are deviations in wave fronts from perfect sphericity, expressed as a function of the angular position around the antenna. We analyzed what effect the phase patterns of dipole and patch antennas onboard two flying spin satellites, Rstar and Vstar, used in the Japanese lunar mission, SELENE (KAGUYA), had on 2-way and 4-way Doppler measurements, and detected higher harmonics in the spin frequency up to an order of 26 in the Doppler frequency. We developed a low-pass filter (LPF) using a Kaiser window, with the optimal parameters empirically determined, to remove the influence of phase patterns and to precisely conserve information on the lunar gravity field. We processed the 2-way and 4-way Doppler data of SELENE by using LPF. After using LPF, a high degree of accuracy of about 0.001 Hz was achieved for the 2-way Doppler measurements, and signals that reflected the gravity field on the far side of the Moon were first detected from the 4-way Doppler data. We also suggested a method for estimating the phase response of satellite antennas using the Doppler frequency variations. In order to estimate the Doppler frequency variation, a filtering technique was adopted to extract the harmonics of interest in the residual signal, from which the antenna phase pattern was derived.


Archive | 2009

The Lunar Global Topography by the Laser Altimeter (LALT) Onboard Kaguya (SELENE): Results from the One Year Observation

Hiroshi Araki; Seiichi Tazawa; Hiroaki Noda; Yoshiaki Ishihara; Sander Goossens; N. Kawano; Sho Sasaki; Izumi Kamiya; Hisashi Otake; J. Oberst; C. K. Shum


Archive | 2008

Initial Results of Gravity Experiment by Four-Way Doppler Measurement of Kaguya (SELENE)

Noriyuki Namiki; Tetsu Iwata; K. Matsumoto; Hideo Hanada; Hiroaki Noda; Mizuhito Ogawa; N. Kawano; Kazuyoshi Asari; Sachiko Tsuruta; Sander Goossens; Liu Qing; Fuyuhiko Kikuchi; Yoshiaki Ishihara; Tomomi Ishikawa; Sho Sasaki; C. Aoshima


Archive | 2010

The First Global Topography and Gravimetry of the Moon by KAGUYA

Hiroshi Araki; Sho Sasaki; Yoshiaki Ishihara; Hiroaki Noda; Hideo Hanada; K. Matsumoto; Fuyuhiko Kikuchi; Sander Goossens; Noriyuki Namiki; Tetsu Iwata


Archive | 2010

Lunar Large Impact Basin Structures and Implications for Thermal History

Yoshiaki Ishihara; T. Morota; Tetsu Iwata; K. Matsumoto; Sander Goossens; Sho Sasaki


Archive | 2007

SELENE Small Sub-Satellites for Lunar Gravity Observation

Tetsu Iwata; Noriyuki Namiki; Hideo Hanada; Hiroyuki Minamino; Takehiro Takano; N. Kawano; K. Matsumoto; Sho Sasaki


Archive | 2006

Global Lunar Gravity Field Determination Using Historical and Recent Tracking Data in Preparation for SELENE

Sander Goossens; K. Matsumoto; Noriyuki Namiki; Hideo Hanada; Tetsu Iwata; Sachiko Tsuruta; N. Kawano; Sho Sasaki


Archive | 2009

Observation of Lunar Rotation by Future Landing Missions

Hideo Hanada; Sho Sasaki; Fuyuhiko Kikuchi; Hiroaki Noda; N. Kawano; Ken-ichi Funazaki; Tetsu Iwata; H. Noda H. Kunimori


Archive | 2008

Present Status and Preliminary Results of the Lunar Topography by Kaguya-LALT Mission

Hiroshi Araki; Seiichi Tazawa; Hiroaki Noda; Yoshiaki Ishihara; E. M. Migita; Sho Sasaki; N. Kawano; Izumi Kamiya; J. Oberst


Archive | 2008

Current Status of Acquisition and Processing of Tracking Data from SELENE (Kaguya) Satellites for Lunar Gravity Field Estimation

K. Matsumoto; Sander Goossens; Liu Qing; Tetsu Iwata; Noriyuki Namiki; Hiroaki Noda; Hideo Hanada; Fuyuhiko Kikuchi; Yoshiaki Ishihara; N. Kawano; Sachiko Tsuruta; Kazuyoshi Asari; Tomomi Ishikawa; Sho Sasaki

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Yoshiaki Ishihara

Japan Aerospace Exploration Agency

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Hideo Hanada

Graduate University for Advanced Studies

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Noriyuki Namiki

Chiba Institute of Technology

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Tetsu Iwata

Japan Aerospace Exploration Agency

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N. Kawano

Chinese Academy of Sciences

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