The TANSO-FTS-2 Instrument for the GOSAT-2 Greenhouse Gas Monitoring Mission
The Exelis TANSO-FTS-2 instrument includes a number of new design features intended to improve mission performance. In particular, a new Intelligent Pointing camera system is used to identify cloud-free locations within the field of view, and the instrument's line of sight is autonomously adjusted to collected hyperspectral data from this location. This is expected to greatly increase the yield of useful earth observations, uncontaminated by effects from clouds. Another improvement is a comprehensive set of onboard calibration targets that are used to accurately calibrate the instrument over its entire spectral range. Other improvements include a larger aperture for improved SNR, improvements to the interferometer to ensure high data quality throughout mission life, and an improved scanning system with excellent line of sight stability.
The TANSO-FTS-2 instrument is built upon the successful heritage of the Exelis Cross-track Infrared Sounder (CrIS) instrument, which was launched in 2011 and has been successfully collecting hyperspectral data which produces atmospheric vertical profiles of temperature, water vapor, and pressure. Several key CrIS subsystems are being used as part of the TANSO-FTS-2 design. This paper will summarize the GOSAT-2 mission, the requirements for the TANSO-FTS-s instrument, and key design trade-offs. It will then describe the TANSO-FTS-2 design, and summarize its expected performance compared to its requirements. Top level development plans and schedules will also be provided.