Research Of Key Technologies On Atmospheric Scattering Optical Communication At Near Infrared Light

Laser communication satisfies people's requirement of large data rate communication,and the laser produces scattering effects in the communication process of the atmosphere.However,the scattered light also carries important information.Due to the obvious effect of ultraviolet light scattering and the rapid development of the corresponding detectors,the development of ultraviolet light scattering optical communication is developing rapidly.As the satellite optical communication commonly used infrared or near infrared light to communicate,if we can achieve near-infrared light wavelength of the atmosphere scattered optical communication,we can use scattering light communication in military and other applications.Therefore,it is necessary to carry the study of atmospheric scattered optical communication in out near-infrared light and infrared light.Firstly,based on the basic theory of scattering and absorption in atmosphere and using the single scattering theory model,the theoretical transmission model of system link in atmospheric scattered optical communication is established.In this model,the effects of scattering and absorption are discussed,and the function of the scattering phase function in the scattering process is described.In the introduction of ellipsoidal coordinate system,the theoretical model of the influence of the physical parameters on the whole system is studied.The relationship between the geometry of the received energy and the structural parameters of the system structure is elucidated.Secondly,on the basis of the establishment of the theoretical model,the influence of the geometric parameters on the received energy value and the path loss is studied emphatically.Through the simulation results,it can be better to choose near infrared wavelengths for communication.The smaller the distance,the larger the receiving aperture value,and the receiving energy value is larger when the elevation angle is 3.25°and the elevation angle is 11.46°.At the same time,the impact of the parameters on the path loss is also discussed in detail.Finally,based on the theory of word scattering,the requirements of the system for the smallest pulse width between two pulses are given,and the maximum communication data rate and communication distance under geometric conditions are given.Based on this,data rate,communication distance,transmission and reception elevation angle and transmit and receive half-width for the transmission power are discussed in the case of a given detector and it gives the simulation results and analysis.and according to the communication rate to obtain the theoretical results of bit error rate analysis,the system rough test design is given.After theoretical research,it will provide the theoretical basis for the near-infrared light scattering communication experiment,which has important guiding significance.