Sho Sasaki
ASTRON
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Publication
Featured researches published by Sho Sasaki.
IEEE Transactions on Aerospace and Electronic Systems | 2011
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
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
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
Hiroshi Araki; Sho Sasaki; Yoshiaki Ishihara; Hiroaki Noda; Hideo Hanada; K. Matsumoto; Fuyuhiko Kikuchi; Sander Goossens; Noriyuki Namiki; Tetsu Iwata
Archive | 2010
Yoshiaki Ishihara; T. Morota; Tetsu Iwata; K. Matsumoto; Sander Goossens; Sho Sasaki
Archive | 2007
Tetsu Iwata; Noriyuki Namiki; Hideo Hanada; Hiroyuki Minamino; Takehiro Takano; N. Kawano; K. Matsumoto; Sho Sasaki
Archive | 2006
Sander Goossens; K. Matsumoto; Noriyuki Namiki; Hideo Hanada; Tetsu Iwata; Sachiko Tsuruta; N. Kawano; Sho Sasaki
Archive | 2009
Hideo Hanada; Sho Sasaki; Fuyuhiko Kikuchi; Hiroaki Noda; N. Kawano; Ken-ichi Funazaki; Tetsu Iwata; H. Noda H. Kunimori
Archive | 2008
Hiroshi Araki; Seiichi Tazawa; Hiroaki Noda; Yoshiaki Ishihara; E. M. Migita; Sho Sasaki; N. Kawano; Izumi Kamiya; J. Oberst
Archive | 2008
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