The TANSO-FTS-2 Instrument for the GOSAT-2 Greenhouse Gas Monitoring Mission Ron Glumb, Christopher Lietzke, James Bougher, Alan Bell and Christopher Ellsworth - Exelis, Geospatial Systems (GS), Fort Wayne, Indiana USA GOSAT-2 Provides Improved Measurements of Greenhouse Gases TANSO-FTS-2 is a primary instrument aboard GOSAT-2. It measures high-resolution spectra of upwelling earth radiance in 5 spectral bands (left) to extract concentrations of greenhouse gases (CO 2 , CH 4 ) and artificial emission sources (CO). Optical con- figuration is shown at right. (The development of TANSO-FTS-2 is being performed under a subcontract by Mitsubishi Electric Corporation, the GOSAT-2 prime contractor of Japan Aerospace Exploration Agency (JAXA) GOSAT-2 Project.) TANSO-FTS-2 Instrument Design Leverages Flight-Proven Assemblies New Design Features Enable Improved Mission Performance for GOSAT-2 TANSO-FTS-2 uses many previously flown subsystems (left) for maximum reliability, configured to meet GOSAT-2 requirements (right). TANSO-FTS-2 includes new design features which address Lessons-Learned from the GOSAT-1 mission (see table at left). In particular, an Intelligent Pointing Function has been added (above), which is expected to nearly double the number of cloud-free measurements collected. Heritage Assemblies TANSO-FTS-2 Design GOSAT-2 Design Feature > CrIS-Based Passive Detector Cooler > New Intelligent Pointing Function > Highly Accurate and Stable Scanner > Very Linear Signal Outputs > Interferometer Improvements > Target for ILS Characterization > Multiple Spectralon Surfaces in Solar Calibration Target > Flight-Proven High-Emissivity Infrared Calibration Target Mission Benefits Inherently reliable, achieves temperatures needed for IR detectors Detects cloud-free areas and repoints scanner in real-time to maximize the number of cloud-free measurements Minimizes scene-induced interferogram fluctuations during data collects Minimizes radiance errors due to nonlinearity effects More stable laser metrology laser outputs and more stable ZPD position Accurate on-orbit ILS characterizations in two spectral bands Excellent knowledge of solar calibration target radiances over life CrIS-based target provides emissivity>0.995 and temperature errors <100mK for precise calibration of infrared data Initial FMC Cloud Image With IR FOV at Center of Field A Cloud Mask of the Area is Produced to Identify Clear Area IR FOV is Shifted to Clear Area; Interfer- ogram Collect Starts Band 1 Band 2 Band 3 Band 4 and 5 Detector Cooler Interferometer 2-Axis Scanner ILS Target FOV Camera Telescope Solar Cal Target Optical Shield IR Cal Target Proven CrIS and AHI based Electronics and Flight Software Flight-proven Passive Cryocooler from CrIS AHI-based Solar Calibration Target ABB’s TANSO Interferometer with Improvements and larger Aperture FOV Monitor Camera for Intelligent Pointing CrIS-based High Performance Two-Axis Scanner CrIS-based Telescope and Aft Optics State-of-the-art Infrared Calibration Target
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The TANSO-FTS-2 Instrument for the GOSAT-2 Greenhouse Gas Monitoring MissionRon Glumb, Christopher Lietzke, James Bougher, Alan Bell and Christopher Ellsworth - Exelis, Geospatial Systems (GS), Fort Wayne, Indiana USA
GOSAT-2 Provides Improved Measurements of Greenhouse GasesTANSO-FTS-2 is a primary instrument aboard GOSAT-2. It measures high-resolution spectra of upwelling earth radiance in 5 spectral bands (left) to extract concentrations of greenhouse gases (CO2, CH4) and artificial emission sources (CO). Optical con-figuration is shown at right. (The development of TANSO-FTS-2 is being performed under a subcontract by Mitsubishi Electric Corporation, the GOSAT-2 prime contractor of Japan Aerospace Exploration Agency (JAXA) GOSAT-2 Project.)
TANSO-FTS-2 Instrument Design Leverages Flight-Proven Assemblies
New Design Features Enable Improved Mission Performance for GOSAT-2
TANSO-FTS-2 uses many previously flown subsystems (left) for maximum reliability, configured to meet GOSAT-2 requirements (right).
TANSO-FTS-2 includes new design features which address Lessons-Learned from the GOSAT-1 mission (see table at left). In particular, an Intelligent Pointing Function has been added (above), which is expected to nearly double the number of cloud-free measurements collected.
Heritage Assemblies
TANSO-FTS-2 Design
GOSAT-2 Design Feature
> CrIS-Based Passive Detector Cooler
> New Intelligent Pointing Function
> Highly Accurate and Stable Scanner
> Very Linear Signal Outputs
> Interferometer Improvements
> Target for ILS Characterization
> Multiple Spectralon Surfaces in Solar Calibration Target
> Flight-Proven High-Emissivity Infrared Calibration Target
Mission Benefits
Inherently reliable, achieves temperatures needed for IR detectors
Detects cloud-free areas and repoints scanner in real-time to maximize the number of cloud-free measurements
Minimizes scene-induced interferogram fluctuations during data collects
Minimizes radiance errors due to nonlinearity effects
More stable laser metrology laser outputs and more stable ZPD position
Accurate on-orbit ILS characterizations in two spectral bands
Excellent knowledge of solar calibration target radiances over life
CrIS-based target provides emissivity>0.995 and temperature errors <100mK for precise calibration of infrared data
Initial FMC Cloud Image With IR FOV at Center of Field
A Cloud Mask of the Area is Produced to Identify Clear Area
IR FOV is Shifted to Clear Area; Interfer-ogram Collect Starts
Band 1 Band 2 Band 3
Band 4 and 5
DetectorCoolerInterferometer
2-Axis Scanner
ILS Target
FOV Camera
Telescope
Solar CalTarget
Optical Shield
IR Cal Target
Proven CrIS and AHI based Electronics and Flight Software
Flight-proven PassiveCryocooler from CrIS
AHI-based Solar Calibration Target
ABB’s TANSO Interferometer with Improvements and larger Aperture
FOV Monitor Camera for Intelligent Pointing CrIS-based High
Performance Two-Axis Scanner
CrIS-based Telescopeand Aft Optics
State-of-the-art Infrared Calibration Target
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