CRISM scan system

The Compact Reconnaissance Imaging Spectrometer for Mars, (CRISM) is a visible-infrared imaging spectrometer that has been operating aboard the Mars Reconnaissance Orbiter (MRO) since November 2006. To achieve high spatial and spectral resolution CRISM's optical sensor unit (OSU) is gimbaled so that apparent along track motion can be removed by the scan system. Our paper describes the data processing flow, the physical scan control system and the performance achieved so far in orbit around Mars.