We report realistic performance simulation results for a new MWIR camera. It is designed for early detection of long distance missile plumes over few hundreds kilometer in the distance range. The camera design uses a number of refractive optical element and a IR detector. Both imaging and radiometric performance of the camera are investigated by using large scale ray tracing including targets and background scene models. Missile plume radiance was calculated from using CFD type radiative transfer algorithm and used as the light source for ray tracing computation. The atmospheric background was estimated using MODTRAN utilizing path thermal radiance, single/multiple scattered radiance and transmittance. The ray tracing simulation results demonstrate that the camera would satisfy the imaging and radiometric performance requirements in field operation at the target MWIR band.
In recent years, high performance visible and IR cameras have been used widely for tactical airborne reconnaissance.
The process improvement for efficient discrimination and analysis of complex target information from active battlefields
requires for simultaneous multi-band measurement from airborne platforms at various altitudes. We report a new dual
band airborne camera designed for simultaneous registration of both visible and IR imagery from mid-altitude ranges.
The camera design uses a common front end optical telescope of around 0.3m in entrance aperture and several relay
optical sub-systems capable of delivering both high spatial resolution visible and IR images to the detectors. The camera
design is benefited from the use of several optical channels packaged in a compact space and the associated freedom to
choose between wide (~3 degrees) and narrow (~1 degree) field of view. In order to investigate both imaging and
radiometric performances of the camera, we generated an array of target scenes with optical properties such as reflection,
refraction, scattering, transmission and emission. We then combined the target scenes and the camera optical system into
the integrated ray tracing simulation environment utilizing Monte Carlo computation technique. Taking realistic
atmospheric radiative transfer characteristics into account, both imaging and radiometric performances were then
investigated. The simulation results demonstrate successfully that the camera design satisfies NIIRS 7 detection criterion.
The camera concept, details of performance simulation computation, the resulting performances are discussed together
with future development plan.