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The TRISHNA program marks a step further in the fruitful cooperation built between CNES and ISRO since many years, through a new Earth observation mission dedicated to the improvement of water cycle understanding and water resource management. Thanks to its unprecedented high spatial resolution in the thermal infrared domain, together with a high revisit frequency, TRISHNA mission will significantly contribute to the detection of ecosystem stress and to the optimization of water use in agriculture in a context of global climate change. The TRISHNA payload is composed of two principal instruments: the VNIR-SWIR imager provided by ISRO, and the TIR (Thermal InfraRed) imager. CNES is responsible for the TIR instrument development with Airbus Defence and Space as a prime contractor. The targeted launch date for TRISHNA satellite is 2025, being then positioned as a precursor of the LSTM Copernicus mission from ESA. This paper presents a status of the TIR instrument development, currently in phase C after a successful Preliminary Design Review in 2021. The equipment development status is detailed, and the progress of validation activities at Airbus level is addressed, focusing on the tests at detection laboratory with a full detection chain including a Development Model (DM) detector, and the preparation of the extensive test campaign to be done on an Engineering Model (EM) of an equipped cryostat (including EM detector, filters, and cryocoolers). An overview of the instrument predicted radiometric, spectral and geometric performances is also presented, as well as some measured elementary performances already available on FM optics.
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