| Objective: ||Develop/implement methods for fast generation of realistic synthetic scenes, including significant atmospheric degrading, used to simulate directed energy tracking and aim point maintenance systems.
|| Description: ||Many directed energy system concepts require tracking a target and pointing laser beams through the atmosphere. The target image and projected beams experience degradation due to atmospheric effects, including absorption, extinction, turbulence, aero-optics and thermal blooming. The target scenes can be very complex; they can include natural and man-made objects, active and passive illumination, clutter, obscurants, and dynamics. The effectiveness of many directed energy systems is directly impacted by the stability of the projected beams on target. For this reason these systems implement complex sensing and control schemes to reduce atmospheric effects and other jitter sources. Simulations which test these aim point maintenance algorithms require realistic synthetic imagery -- degraded by the same atmospheric effects acting on the projected beams. Generating such scenes is very time consuming and makes running simulations inconveniently complicated and slow. This topic is intended to develop faster techniques for generating atmospherically degraded synthetic scenes. This would allow more effective use of simulations to develop and evaluate closed-loop tracking and aim point maintenance algorithms.
|| ||PHASE I: Develop, specify, evaluate and demonstrate a synthetic scene generation algorithm with atmospheric degradation. Algorithm should be able to reduce computation time by a factor of ten over techniques currently used to evaluate closed-loop tracking and aim point maintenance algorithms.
|| || ||PHASE II: Implement the synthetic scene generation algorithm in an existing simulation environment that includes all capabilities necessary to develop and evaluate aim point maintenance algorithms.
|| ||DUAL USE COMMERCIALIZATION: Military application: Laser and optical systems that are adversely affected by propagation effects. Synthetic scene generation algorithms apply to tactical lasers, night-vision goggles and telescopes. Commercial application: Laser and optical systems that are adversely affected by propagation effects. Synthetic scene generation algorithms apply to night-vision goggles, telescopes and medical and machining laser systems.
|| References: ||1. S. C. Coy, "ABLSim: a user-friendly wave optics propagation code," Proceedings of SPIE, Volume 3706, 1999.
2. L. C. Andrews and R. L. Phillips, “Laser Propagation through Random Media,” SPIE Optical Engineering Press, Bellingham, WA, (1998).
3. M. C. Roggemann and B. Welsh, “Imaging through Turbulence,” CRC Press, Boca Raton, FL, (1996).|
|Keywords: ||adaptive optics, lasers, atmospheric turbulence, imaging, aero-optics, thermal blooming, high energy laser (HEL)|