<title>SPIRIT: a hyperspectral infrared imager</title>

Abstract

The SPIRIT system is a spectrally agile infra-red imaging airborne camera, with the capability to select any of the multiple (narrow band) filters on a frame by frame basis. The implemented solution employs advanced, but proven, technology to meet the objectives, and achieved good spatial and thermal performance in all modes. Sophisticated electronic design has resulted in a flexible unit, which can respond to the changing requirements of the user. Initial SPIRIT flight trials were undertaken in summer 1998 with more scheduled to continue through 1999. The sensor was installed on to DERA's TIARA research platform, a modified Tomado F2. The flight trials to date have been conducted over a variety of scenarios, collecting spectral data in up to 12 bands, of other aircraft, tanks, and fixed targets. Further ground-based trials, with the sensor mounted on a pan and tilt tracking platform, have been performed on characterised targets and against further air targets. Data from these initial trials are currently being processed to assess whether sufficient spectral information is available to discriminate between target types at militarily significant ranges. Sample hyperspectral imagery from SPIRIT and some results are presented.