Discuss Performance of Corner-Cube Prism for Modulating Retro-Reflector Terminal in Free-Space Laser Communication
Modulating Retro-reflector terminal does not need capture, tracking, targeting(ATP) sub-system .The key unit of this type structure is corner- cube prism,its performance will cause the light beam intensity distribution and light beam divergence angle .There are several factors ,such as effective area , right-angle accuracy, surface-type errors .Those errors caused loss of light power result in communication fail,so in this paper we made a precise analysis as a supplement.
Modulating retro-reflector lasercom systems at the Naval Research Laboratory
Free space optical (FSO) communication has enjoyed a renewal of interest driven by increasing data rate requirements and the crowding of the RF spectrum, affecting both commercial and military sectors. Military communications must also deal with intentional or unintentional jamming, as well as frequency allocation restrictions, neither of which affects FSO. The U.S. Naval Research Laboratory (NRL) has been conducting research on FSO communications since 1998 with an emphasis on tactical applications. NRL's FSO research has covered propagation studies in the maritime domain, component development, and systems demonstrations. NRL has developed both conventional laser communications systems and retro-reflecting systems for small platforms. This paper reviews some of the retro-reflecting work, discusses applications of FSO in the areas of explosive ordnance disposal (EOD) and unmanned aerial vehicles (UAVs), and describes future directions.
Creating the Virtual Universe
Simulation software is important to our understanding of the universe. The intrinsic multiphysics aspects are spiced with a range of temporal scales and spatial scales, both of which cover more digits than are available in the standard hardware. This, together with the intrinsic chaotic nature of many physical processes, poses quite a challenge. To meet this challenge, researchers developed the Astronomical Multipurpose Environment (AMUSE). Instead of writing a suite of multiphysics solvers from scratch, AMUSE's developers coupled existing solvers for each physical ingredient. The result is a highly inhomogeneous collection of dedicated solvers with a homogeneous protocol that scales to supercomputers.