Dr. Nobuhiro Takahashi Profile

Dr. Nobuhiro Takahashi

at NICT

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Author

Publications (7)

Proceedings Article | 12 October 2015 Paper

EarthCARE/CPR design results and PFM development status

Kenta Maruyama, Eiichi Tomita, Hirotaka Nakatsuka, Yoshihisa Aida, Yoshihiro Seki, Kazuyuki Okada, Yasuyuki Ishii, Nobuhiro Tomiyama, Nobuhiro Takahashi, Yuichi Ohno, Hiroaki Horie, Kenji Sato

Proceedings Volume 9639, 96390H (2015) https://doi.org/10.1117/12.2194670

KEYWORDS: Clouds, Radar, Space operations, Antennas, Aerosols, Satellites, Atmospheric modeling, Doppler effect, Manufacturing, Atmospheric particles

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Proceedings Article | 19 November 2012 Paper

EarthCARE/CPR design and verification status

K. Okada, T. Kimura, H. Nakatsuka, Y. Seki, G. Kadosaki, J. Yamaguchi, N. Takahashi, Y. Ohno, H. Horie, K. Sato

Proceedings Volume 8533, 85330D (2012) https://doi.org/10.1117/12.974479

KEYWORDS: Clouds, Radar, Calibration, Aerosols, Doppler effect, Space operations, Antennas, Reflectors, Multispectral imaging, Velocity measurements

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Proceedings Article | 9 November 2012 Paper

Conceptual study of the future cloud-precipitation observation mission from space

Nobuhiro Takahashi, Misako Kachi, Takuji Kubota, Kinji Furukawa

Proceedings Volume 8528, 85281G (2012) https://doi.org/10.1117/12.977353

KEYWORDS: Satellites, Radar, Clouds, Microwave radiation, Meteorology, Radiometry, Meteorological satellites, Climate change, Sensors, Computing systems

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Proceedings Article | 8 November 2012 Paper

Simulation for spaceborne cloud profiling Doppler radar: EarthCARE/CPR

Hiroaki Horie, Nobuhiro Takahashi, Yuichi Ohno, Kenji Sato

Proceedings Volume 8523, 852318 (2012) https://doi.org/10.1117/12.977253

KEYWORDS: Doppler effect, Clouds, Velocity measurements, Radar, Antennas, Profiling, Satellites, Computer simulations, Signal to noise ratio, MATLAB

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Proceedings Article | 13 October 2010 Paper

Development status of Japanese space-borne cloud profiling radar for EarthCARE mission

K. Okada, T. Kimura, H. Nakatsuka, K. Sato, Y. Seki, Y. Sakaide, H. Kumagai, N. Takahashi, Y. Ohno, H. Horie

Proceedings Volume 7826, 782609 (2010) https://doi.org/10.1117/12.866329

KEYWORDS: Clouds, Radar, Atmospheric modeling, Space operations, Profiling, Doppler effect, Earth's atmosphere, Atmospheric particles, Aerosols, Antennas

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Proceedings Article | 29 September 2009 Paper

Development status of cloud profiling radar for EarthCARE

Hirotaka Nakatsuka, Hiroaki Horie, Kazuyuki Okada, Yasuo Sakaide, Toshiyoshi Kimura, Yuichi Ohno, Kenji Sato, Nobuhiro Takahashi, Hiroshi Kumagai

Proceedings Volume 7474, 74740O (2009) https://doi.org/10.1117/12.830345

KEYWORDS: Clouds, Doppler effect, Radar, Calibration, Satellites, Data acquisition, Antennas, Profiling, Atmospheric modeling, Reflectors

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Proceedings Article | 2 December 2008 Paper

Evaluation of the estimation method for nonuniformity of rainfall within a footprint of TRMM/PR using the data during 180-degree yaw maneuver

Nobuhiro Takahashi, Toshio Iguchi

Proceedings Volume 7154, 71540L (2008) https://doi.org/10.1117/12.806382

KEYWORDS: Meteorology, Signal attenuation, Satellites, Detection and tracking algorithms, Radar, Data centers, Data processing, Clouds, Sun, Solar energy

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The Tropical Rainfall Measuring Mission (TRMM) satellite performs 180-degree yaw maneuver (yaw-around) when the solar beta angle which is the angle between the satellite orbit plane and the direction to the sun crosses the 0-degree The yaw-maneuver is completed about 16 minutes (about 7000 km in flight length on the Earth) in the TRMM case. During the yaw-around, the Precipitation Radar (PR) onboard TRMM continues nominal observation (but data processing is limited to level-1 algorithms). Therefore very dense observation is realized during the yaw-around. Since nearly fixed target (rain echo and surface echo) is observed by different incident angles in a short time, new information can be obtained that cannot be obtained nominal observation. On the incident angle dependency of the sea surface echo, we can avoid the uncertainties comes from the changes in the target. Range profiles of the sea surface echo of different incident angles can be compared with the long-term global average data. The same approach can be used to quantitative estimation of bright band structure such as blurring effect of the off-nadir incident angles. For convective echoes, the non-uniform beam filling (NUBF) effect can be estimated by the different incident angle data and the data which location is slightly offset from the center. More reliable path integrated attenuation (PIA) can be obtained from different incident angle data and the NUBF can be estimated both by the range profiles of surface echo of off-nadir angle bin data with an approach by Takahashi et al. (2006) and their change with the location within a footprint. Two NUBF cases are demonstrated in this paper showing the horizontal sub-footprint size distribution of PIA. The results are confirmed by the consistency of different angle data with slight offset location. In addition, this method is evaluated by the PIA pattern data obtained from densely distributed (because of 180-degree yaw maneuver) data using the method similar to the standard algorithm for TRMM/PR.

Showing 5 of 7 publications

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