Long-Range Laser Imaging

TL;DR: It is shown that the laser signal level ultimately limits the number of target pixels and it is concluded that the most promising sensor design is based on conventional imaging and recommendations for proof-of-concept experiments are given.

Abstract: : This report summarizes a research program in which we evaluated the use of a Long-Range Laser Imaging (LRLI) system to perform the imaging tasks associated with laser target designation. The motivation for LRLI is to improve crew and aircraft survivability by increasing the standoff range, and reducing the required time interval, for air-based laser target designation. In this program we analyzed the capabilities of LRLI systems. We considered the signal level and its impact on sensor field-of-view. This analysis includes laser selection, atmospheric transmission, target reflectivity and optical system characteristics. It is shown that the laser signal level ultimately limits the number of target pixels. It is also shown that a pulsed system is required for background rejection. The impact of optical turbulence on system performance is also discussed. We evaluated the achievable resolution and considered the use of adaptive optics. It is shown, however, that severe anisoplanatism limits the utility of adaptive optics. We conclude that the most promising sensor design is based on conventional imaging and recommendations for proof-of-concept experiments are given. Active Imaging, Atmosphere, Absorption, Turbulence