Research On Local Infrared Laser Broadcasting And Communication System

Point-to-point laser communication in space has been mature after decades of development.This paper explores an effective means to realize local laser broadcasting in a limited range and proposes a new communication mode.From the perspective of optical power optimization,the laser beam spreading theory model and the parallel light curtain theory model are compared and analyzed,and the optical power distribution model of the parallel light curtain theory is revealed.Combining the theory of gaussian beam transformation optics imaging contrast the cylindrical lens optical system and Powell prism optics system,through the optical design software to simulate the far field intensity distribution of the parallel light curtain,Powell prism can effectively eliminate the gaussian beam is pointed out at the center of the hot spots and faded marginal distribution,improve the communication efficiency of the laser radio communication system.Aiming at the problem of multi-axis precise calibration of the parallel light screen system,a dual-path scanning field of view optical calibration system was designed.The parallel light screen was calibrated simultaneously by the visible light camera and the infrared camera controlled by a two-dimensional servo turntable,and its calibration accuracy was analyzed to meet the requirements of calibration accuracy.On this basis,a local infrared laser broadcasting and communication system is designed and constructed,and the device selection and optimization design of laser transmitting system and laser receiving system are studied.Finally,the field communication experiment was carried out to explore the influence of different climatic environments on the laser broadcasting communication system,analyze the uniformity of light power distribution of parallel light curtain,and verify the superiority of the theoretical model of parallel light curtain and the feasibility of laser broadcasting communication.