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TacSat-3
TacSat-3 was the third in a series of U.S. military reconnaissance satellites. It was assembled in an Air Force Research Laboratory Space Vehicles Directorate facility at Kirtland Air Force Base, New Mexico. The TacSat satellites are all designed to demonstrate the ability to provide real-time data collected from space to combatant commanders in the field. TacSat-3 includes three distinct payloads: the Advanced Responsive Tactically Effective Military Imaging Spectrometer (ARTEMIS) hyperspectral imager, the Ocean Data Telemetry Microsatellite Link and the Space Avionics Experiment.
==Design==
TacSat-3 uses a standard satellite bus developed and provided by ATK. The payload consists of a two mirror Ritchey–Chrétien telescope plus correction optics, with a focus device incorporated in the secondary mirror unit, and with a slit Offner spectrometer. The spectrometer uses the ARTEMIS hyperspectral imaging sensor (HSI), which is a single HgCdTe Focal Plane Array covering the entire V/NIR/SWIR spectrum from 400 nm to 2500 nm at a uniform resolution of 5 nm. ARTEMIS measures first the spectral information at each point on the ground in 400 spectral channels. HSI data cubes obtained by ARTEMIS are then handled by a reprogrammable digital signal processor with 16 GB data storage capability to generate on-board products and for in-theater downlink. TacSat-3's main focus is land-based HSI. According to Peter Wegner from the Operationally Responsive Space Office, TacSat-3 cost US$90 million
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