Yohei Satoh
Japan Aerospace Exploration Agency
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Publication
Featured researches published by Yohei Satoh.
Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing IX | 2013
Takashi Kobayashi; Takahiro Endo; Yoshito Sawada; Shigeru Endo; Masato Hayashi; Yohei Satoh; Yoshikazu Chishiki; Shiro Yamakawa
High-accuracy three-dimensional (3D) information of global area is useful in various fields, such as global observations of canopy height, elevation and ice sheet. Especially, there are pressing needs to advance understanding of how changes in the 3D structure of terrestrial vegetation are affecting the global carbon dynamics and their implications for climate change. Thus new space based observations are needed to measure global maps of the 3D structure of vegetation. Japan Aerospace Exploration Agency has started a conceptual study of the spaceborne vegetation LiDAR called MOLI (Multi- Footprint Observation LiDAR and Imager) which will enable us to obtain high-accuracy 3D information of vegetation areas from the globe. To investigate waveforms and analysis procedure, the waveform-simulator for MOLI was developed. Comparing with previous studies about the canopy height estimation from GLAS waveforms, waveform analysis procedure in which waveforms were fitted with a sum of Gaussian functions was studied. The maximum canopy height error was divided into two components; the basic error (EB) which was not depending on terrain index (TI), which was the vertical difference between the highest and lowest elevation within a footprint, and the error depending on TI (ETI). The total error (ETotal) could be RMS of the two. We propose ETotal in which EB is 1 m and ETI is 1/3*TI as a target observation accuracy of MOLI. According to this error estimation, the observation accuracy of MOLI is 1m at a plane area (TI ≈ 0) and 3 m at slope area up to about 20 degree.
Lidar Remote Sensing for Environmental Monitoring XIII | 2012
Takahiro Endo; Takashi Kobayashi; Yohei Satoh; Yoshito Sawada; Nobuo Sugimoto; Kohei Mizutani; Haruo Sawada; Kazuhiro Asai
This paper describes the method and process of developing a forest echo signal simulator to be applied in “iLOVE” : Issjem LiDAR Observation of Vegetation Environment. The goal of this study was to develop an echo signal simulation model and to visualize the generation process of echo signals. The simulator consists of four components: 1) terrain and features, 2) sensor configuration, 3) echo signal generation and 4) visualization. Terrain and feature data were defined to be full polygon object in 3D space. A laser beam refers to numerous sub laser beams, with each sub laser beam featuring specific intensity based on TEM00. The time-series intensity change of sub laser beams was based on Gaussian distribution. At the start of the echo signal generating process, intersections between sub laser beams and target objects were calculated. Then, echo signal of sub laser beams was calculated from the position of intersections, pulse width and specific reflectance of target objects. Finally, an echo signal suitable for footprint size was calculated by synthesizing echo signals of sub laser beams. Meanwhile, intersections were drawn in 3D on the surface of target objects. The results indicated that the simulator was highly useful for understanding the relationship between the echo signal and the structure of target objects, and also for developing algorism for forest applications.
International Conference on Space Optics 2012 | 2017
Shiro Yamakawa; Yohei Satoh; Yoshikazu Chishiki; Daisuke Sakaizawa
Up-link Laser Differential Absorption Sensing: ULDAS, shown in Fig.1, is a new method to measure green house gas concentration with earth observation satellites. Although the measurement area is restricted in only small visible area of an optical ground station, ULDAS has outstanding features as followed: - Faster: Easy to development, small size and small resource requirements to satellite system - Better: High accuracy (CO2 observation error of weighted column is <0.3% which corresponds to 1ppm error of atmospheric concentration) - Cheaper: Simple system, small number of parts and no special parts The flight segment of the ULDAS is able to be loaded on a marginal resource of green house effect observation satellites, such as Japanese GOSAT-series. In this paper, the feasibility study of the mission concept and field experiments are reported.
Lidar Remote Sensing for Environmental Monitoring XIII | 2012
Daisuke Sakaizawa; Yoshikazu Chishiki; Yohei Satoh; Tatsuyuki Hanada; Shiro Yamakawa; Takayo Ogawa; Satoshi Wada; Shoken Ishii; Kohei Mizutani; Motoaki Yasui
Laser remote sensing technologies are valuable for a variety of scientific requirements. These measurement techniques are involved in several earth science areas, including atmospheric chemistry, aerosols and clouds, wind speed and directions, prediction of pollution, oceanic mixed layer depth, vegetation canopy height (biomass), ice sheet, surface topography, and others. Much of these measurements have been performed from the ground to aircraft over the past decades. To improve knowledge of these science areas with transport models (e.g. AGCM), further advances of vertical profile are required. JAXA collaborated with NICT and RIKEN started a new cross-sectional 3-year program to improve a technology readiness of the critical 1-micron wavelengths from 2011. The efficient frequency conversions such as second and third harmonic generation and optical parametric oscillation/generation are applied. A variety of elements are common issues to lidar instruments, which includes heat rejection using high thermal conductivity materials, laser diode life time and reliability, wavelength control, and suppression of contamination control. And the program has invested in several critical areas including advanced laser transmitter technologies to enable science measurements and improvement of knowledge for space-based laser diode arrays, Pockels cells, advanced nonlinear wavelength conversion technology for space-based LIDIRs. Final goal is aim to realize 15 watt class Q-switched pulse laser over 3-year lifetime.
Acta Astronautica | 2009
Yugo Kimoto; Yohei Satoh; Hiroshi Tachihara
Journal of The Meteorological Society of Japan | 2017
Shoken Ishii; Philippe Baron; Makoto Aoki; Kohei Mizutani; Motoaki Yasui; Satoshi Ochiai; Atsushi Sato; Yohei Satoh; Takuji Kubota; Daisuke Sakaizawa; Riko Oki; Kozo Okamoto; Toshiyuki Ishibashi; Taichu Y. Tanaka; Tsuyoshi Thomas Sekiyama; Takashi Maki; Koji Yamashita; Tomoaki Nishizawa; Masaki Satoh; Toshiki Iwasaki
Sola | 2016
Shoken Ishii; Kozo Okamoto; Philippe Baron; Takuji Kubota; Yohei Satoh; Daisuke Sakaizawa; Toshiyuki Ishibashi; Taichu Y. Tanaka; Koji Yamashita; Satoshi Ochiai; Kyoka Gamo; Motoaki Yasui; Riko Oki; Masaki Satoh; Toshiki Iwasaki
Journal of The Meteorological Society of Japan | 2017
Philippe Baron; Shoken Ishii; Kozo Okamoto; Kyoka Gamo; Kohei Mizutani; Chikako Takahashi; Toshikazu Itabe; Toshiki Iwasaki; Takuji Kubota; Takashi Maki; Riko Oki; Satoshi Ochiai; Daisuke Sakaizawa; Masaki Satoh; Yohei Satoh; Taichu Y. Tanaka; Motoaki Yasui
2017 IEEE International Conference on Space Optical Systems and Applications (ICSOS) | 2017
Yohei Satoh; Yuko Miyamoto; Yutaka Takano; Shiro Yamakawa; Hiroki Kohata
Japan Geoscience Union | 2015
Shoken Ishii; Kozo Okamoto; Yohei Satoh; Atsushi Sato; Philippe Baron; Toshiyuki Ishibashi; Taichu Y. Tanaka; Tsuyoshi Thomas Sekiyama; Tomoaki Nishizawa; Motoaki Yasui; Kohei Mizutani; Shiro Yamakawa; Riko Oki; Masaki Sato; Toshiki Iwasaki
Collaboration
Dive into the Yohei Satoh's collaboration.
National Institute of Information and Communications Technology
View shared research outputsNational Institute of Information and Communications Technology
View shared research outputsNational Institute of Information and Communications Technology
View shared research outputsNational Institute of Information and Communications Technology
View shared research outputs