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pre-launch instrument characterization results and in-orbit verification plan of GCOM-C/SGLI 21

Pre-launch instrument characterization results and in-orbit ...

引用

Conference on Sensors, Systems, and Next-Generation Satellites XXI

作者： Urabe, Tomoyuki Ando, Shigemasa Okamura, Yoshihiko Tanaka, Kazuhiro Mokuno, Masaaki Amano, Takahiro Shiratama, Koichi Yoshida, Jun Japan Aerosp Explorat Agcy 2-1-1 Sengen Tsukuba Ibaraki 3058505 Japan NEC Corp Ltd 1-10 Nisshin Cho Fuchu Tokyo 1838501 Japan

ISBN: (纸本)9781510613119;9781510613102

The Global Change Observation Mission (GCOM) aims to establish and demonstrate a global, long-term satellite-observing system to measure essential geophysical parameters to facilitate understanding the global water circulation and climate change, and eventually contribute to improving future climate projection through a collaborative framework with climate model institutions. GCOM consists of two polar orbiting satellite observing systems, GCOM-W (Water) and GCOM-C (Climate). The first satellite, GCOM-W with Advance Microwave Radiometer -2 (AMSR-2), was already launched in 2012 and has been observing continuously. The follower satellite, GCOM-C with Second Generation Global Imager (SGLI), will be launched in Japanese fiscal year 2017. SGLI enables a new generation of operational moderate resolution-imaging capabilities following the legacy of the GLI on ADEOS-II (Advanced Earth Observing Satellite-II) satellite. The SGLI empowers surface and atmospheric measurements related to the carbon cycle and radiation budget, with two radiometers of Visible and Near Infrared Radiometer (VNR) and Infrared Scanning Radiometer (IRS) which perform a wide-band (380nm-12 mu m) optical observation not only with as wide as 1150-1400km FOV (field of view) but also with as high as 250-500m resolution. Also, polarization and along-track slant view observation are quite characteristic of SGLI, providing the sensor data records for more than 28 standard products and 23 research products including clouds, aerosols, ocean color, vegetation, snow and ice, and other applications. Sensor instrument proto-flight tests including optical characterization tests such as radiometric and geometric were completed, and satellite system proto-flight tests have finished including thermal vacuum, vibration and acoustic test. In this paper, the pre-launch phase instrument characterization of SGLI flight model and status of GCOM-C satellite system flight model along with the overview of them will be describe

关键词： SGLI GCOM Climate change Earth observation Optical sensor pre-launch characterization in-orbit verification

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pre-launch CHARACTERISATION AND IN-ORBIT CALIBRATION OF GCOM-C/SGLI 38

PRE-LAUNCH CHARACTERISATION AND IN-ORBIT CALIBRATION OF GCOM...

引用

38th IEEE International Geoscience and Remote Sensing Symposium (IGARSS)

作者： Okamura, Yoshihiko Hashiguchi, Taichiro Urabe, Tomoyuki Tanaka, Kazuhiro Yoshida, Jun Sakashita, Takashi Amano, Takahiro Japan Aerosp Explorat Agcy Chofu Tokyo Japan NEC Corp Ltd Tokyo Japan

ISBN: (纸本)9781538671504

Global Change Observation Mission (GCOM) consists of two series of satellites, GCOM-W (Water) and GCOM-C (Climate) for long-term monitoring of earth environment. Second-generation Global Imager (SGLI), the onboard mission instrument of GCOM-C, is the wide FOV multi-spectral optical radiometer in the wavelength range of near-UV to thermal infrared. SGLI will provide high accuracy measurements of Ocean, Atmosphere, Land and Cryosphere. JAXA successfully launched the GCOM-C satellite on December 23, 2017, and JAXA is carrying out the in-orbit checkout and initial calibration activities. This paper describes pre-launch characterization summary of the SGLI and in-orbit calibration plan. Especially we focus on the pre-launch and in-orbit radiometric performance.

关键词： SGLI multi-band imaging radiometer pre-launch characterization in-orbit calibration

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Radiometric performance of Second Generation Global Imager (SGLI) using integrating sphere 20

Radiometric performance of Second Generation Global Imager (...

引用

Conference on Sensors, Systems, and Next-Generation Satellites XX

作者： Hashiguchi, Taichiro Okamura, Yoshihiko Tanaka, Kazuhiro Nakajima, Yukinori Suzuki, Koichi Sakashita, Takashi Amano, Takahiro Japan Aerosp Explorat Agcy 2-1-1 Sengen Tsukuba Ibaraki 3058505 Japan JASTECS Corp 1-10 Nisshin Cho Fuchu Tokyo 1838551 Japan NEC Corp Ltd 1-10 Nisshin Cho Fuchu Tokyo 1838551 Japan

ISBN: (数字)9781510604056

ISBN: (纸本)9781510604049;9781510604056

Second-generation Global Imager (SGLI) has a multi-channel in the wavelength range from near-UV to thermal infrared. SGLI consists of two sensor units, Visible and Near Infrared Radiometer (VNR) and Infrared Scanning Radiometer (IRS). We use three integrating spheres for each wavelength range in radiometric tests. The materials of inside wall of sphere are polytetrafluoroethylene (PTFE) and barium sulfate for ultraviolet-visible to near infrared channels, and gold for shortwave infrared channels, respectively. This paper describes the Proto Flight Model (PFM) radiometric performance using these integrating spheres.

关键词： SGLI GCOM optical radiometer climate change pre-launch characterization integrating spehre

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Development and pre-launch test status of Second Generation Global Imager (SGLI) 19

Development and pre-launch test status of Second Generation ...

引用

Conference on Sensors, Systems, and Next- Generation Satellites XIX

作者： Okamura, Yoshihiko Tanaka, Kazuhiro Amano, Takahiro Shiratama, Koichi Hosokawa, Tamiki Japan Aerosp Explorat Agcy Tsukuba Ibaraki 3058505 Japan NEC Corp Ltd Fuchu Tokyo 1838551 Japan

ISBN: (纸本)9781628418491

Global Change Observation Mission (GCOM) consists of two series of satellites, GCOM-W (Water) and GCOM-C (Climate) for long-term monitoring of earth environment. Second-generation Global Imager (SGLI), the onboard mission instrument of GCOM-C, is the wide FOV multi-spectral optical radiometer in the wavelength range of near-UV to thermal infrared. SGLI consists of two sensor units, Visible and Near Infrared Radiometer (SGLI-VNR) and Infrared Scanning Radiometer (SGLI-IRS). SGLI will provide high accuracy measurements of Ocean, Atmosphere, Land and Cryosphere. Manufacturing and sensor system integration of SGLI flight models were completed. The sensor system proto-flight tests (PFTs) are on-going including optical characterization tests such as radiometric tests using an integrating sphere and geometric and MTF tests using a collimator. This paper describes development and pre-launch test status of SGLI flight model. Especially we focus on the pre-launch radiometric performances such as the spectral response characteristics and signal to noise ratio.

关键词： SGLI GCOM optical radiometer climate change pre-launch characterization

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Assessment of On-orbit Crosstalk Impact for SNPP VIIRS VisNIR Bands 19

Assessment of On-orbit Crosstalk Impact for SNPP VIIRS VisNI...

引用

Conference on Earth Observing Systems XIX

作者： Lee, Shihyan Oudrari, Hassan McIntire, Jeff Xiong, Xiaoxiong Sigma Space Corp 4600 Forbes Blvd Lanham MD 20706 USA NASA Goddard Space Flight Ctr Greenbelt MD 20661 USA

ISBN: (纸本)9781628412451

Electronic and optical crosstalk is one of the major challenges facing space-based Earth observing sensors, the effects of which could pose serious risks to the successful retrieval of geophysical information. There was an extensive effort during the SNPP VIIRS design and testing phase to characterize the on-orbit VisNIR crosstalk and its impact on environmental products. This paper describes an approach to assess the level of optical and electronic crosstalk on the measured radiance, and thereafter the retrieved geophysical products. During SNPP VIIRS pre-launch testing, a set of electronic and optical cross-talk influence coefficients was derived from measurements, which represent the amount of signal contamination received by each detector when other detectors on the same focal plane were illuminated. These coefficients were used to assess the potential crosstalk and its uncertainty on typical SNPP VIIRS land, atmosphere and ocean scenes. The simulation results show SNPP VIIRS crosstalk contamination is very small, less than 0.3 % for the stressing scenes, except for bands M7 and I2 over the dark ocean regions. These results are encouraging and constitute further evidence that SNPP VIIRS produces high quality imagery. The simulation approach presented in this paper could also be used for early crosstalk impact assessments for future VIIRS instruments.

关键词： Electronic cross-talk optical cross-talk pre-launch characterization VIIRS products Vis/NIR

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