Dr. Yasushi Kojima Profile

Dr. Yasushi Kojima

at Japan Aerospace Exploration Agency

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Proceedings Article | 19 October 2023 Presentation + Paper

Overview and current status of GOSAT-GW mission and AMSR3 instrument

T. Miura, K. Inaoka, M. Kachi, Y. Kojima

Proceedings Volume 12729, 127290E (2023) https://doi.org/10.1117/12.2678886

KEYWORDS: Satellites, Microwave radiation, Antennas, Radiometry, Earth observing sensors, Sensors

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The Global Observing Satellite for Greenhouse gases and Water cycle (GOSAT-GW) is a polar-orbiting satellite carrying two mission instruments, the Total Anthropogenic and Natural emissions mapping SpectrOmeter-3 (TANSO-3) and Advanced Microwave Scanning Radiometer 3 (AMSR3). TANSO-3 is developed by the Ministry of the Environment as the follow-on mission of Greenhouse-gas Observation Satellite 2 (GOSAT-2) launched in 2018. AMSR3 is developed by the Japan Aerospace Exploration Agency (JAXA) as the Global Change Observation Mission-Water (GCOM-W) follow-on mission to keep continuity of the passive microwave observation. GCOM-W has been operated in almost 11 years in orbit, even after its nominal mission of five years in 2017. Continuous observation by the AMSR-series instruments and early launch of a follow-on instrument are now strongly desired both in science community and in operational fields. Specifications of the AMSR3 are almost equivalent to those of AMSR2. The characteristics and performances of existing 16 frequency channels are secured by making use of heritage design. Meanwhile, three high frequency channels (166 GHz, 183±3 GHz and 183±7 GHz) and 10-GHz channels with improved Noise Equivalent Delta Temperature (NEDT) are added for observation of solid precipitation and humidity and improvement in measurement accuracy of sea surface temperature, respectively. These additional channels will enhance data utilization in wide fields such as meteorology, water cycle studies, polar research, and fishery. Development of GOSAT-GW and AMSR3 had been officially approved in December 2019 and moved into Phase-C since March 2021. An overview and status of the mission are given in this paper.

Proceedings Article | 20 September 2020 Presentation

Overview and current status of GOSAT-GW mission and AMSR3 instrument

Marehito Kasahara, Misako Kachi, Kazuya Inaoka, Hideyuki Fujii, Takushi Kubota, Rigen Shimada, Yasushi Kojima

Proceedings Volume 11530, 1153007 (2020) https://doi.org/10.1117/12.2573914

KEYWORDS: Satellites, Earth observing sensors, Microwave radiation, Temperature metrology, Gases, Spectroscopy, Radiometry, Aerospace engineering, Solids, Humidity

Read Abstract +

Global Observing Satellite for Greenhouse gases and Water cycle (GOSAT-GW) is a polar-orbiting satellite carrying two mission instruments, Total Anthropogenic and Natural emissions mapping SpectrOmeter-3 (TANSO-3) and Advanced Microwave Scanning Radiometer 3 (AMSR3). TANSO-3 is developed by Ministry of the Environment for the follow-on mission of Greenhouse-gas Observation Satellite 2 (GOSAT-2) launched in 2018. AMSR3 is developed by Japan Aerospace Exploration Agency (JAXA) for the Global Change Observation Mission-Water (GCOM-W) follow-on mission to keep continuity of the passive microwave observation. GCOM-W had completed its nominal mission of five years in 2017 and has transferred to extended operation phase. Continuous observation by the onboard instrument, AMSR2 and early launch of a follow-on instrument are now strongly required both in science community and in operational fields. Specifications of the AMSR3 is almost equivalent to AMSR2. The characteristics and performances of existing 16 frequency channels are secured by making use of heritage design, meanwhile three high frequency channels (166 GHz, 183±3 GHz and 183±7 GHz) and 10-GHz channels with improved Noise Equivalent Delta Temperature (NEDT) will be added for observation of solid precipitation and humidity and improvement in measurement accuracy of sea surface temperature. These additional channels will enhance data utilization in wide fields such as meteorology, polar research and fishery. To produce long-term continuous data record by succeeding to GCOM-W is also one of the most important targets for studies on global climate change. Development of GOSAT-GW and AMSR3 had been officially approved in December 2019 and moved into Phase-B. An overview and current status of the mission and AMSR3 are given in this paper.

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