Design And Realization Of Small Portable Laser Communication Receiving System

Small portable laser communication system is a new communication device based on space laser communication,which has the advantages of short delay,high communication rate,strong anti-interference,small size and good confidentiality.It is the best way to solve the communication problems of security department,emergency communication,special and temporary communication,and information exchange in military and civil research fields It's of great value on the issue.Therefore,the future development potential of this communication mode is huge,and it has broad application space.In this experimental analysis,the design and implementation of the small portable laser communication system are mainly carried out,and the actual communication function of the system is verified.Firstly,this paper discusses the problem of atmospheric effects interfering with laser communication,deeply analyzes the theoretical models of atmospheric scattering effects and atmospheric absorption,and analyzes the system communication wavelength of1550 nm.Research on the influence of atmospheric turbulence on the system bit error rate provides a theoretical basis for the subsequent design of atmospheric turbulence scintillation suppression methods.Based on factors such as volume and atmospheric effects,select a communication mechanism that is consistent with this system.Secondly,the various loss factors of the small portable laser communication system link are analyzed.As for the link equation,it not only meets the threat of atmosphere,which leads to the adverse damage to the accuracy,but also needs to deeply analyze the main parameters of the loss on the link,and obtains the maximum optical axis deflection Angle and the maximum receiving field Angle that the system allows.The link energy under different image plane deviations is simulated and analyzed,and the relevant technical requirements of subsystem design are obtained.Finally,the design and performance test of the system are completed,and the common receiving antenna characteristics are compared.Finally,the type of receiving antenna selected by the system is determined,and the design of the optical subsystem is completed.At the same time,based on APD detector,an atmospheric turbulence suppression algorithm to control scintillation variance is proposed,Moreover,a new atmospheric turbulence suppression algorithm based on the platform of APD detector is proposed,which can design a good receiver.After the mechanical design of the receiving system,the prototype is constructed.Through the field experiment,the suppression effect and communication performance of the system in turbulent environment are tested,and the actual link receiving energy is obtained.The results show that the system can suppress the scintillation variance more than three times,and reduce the communication error rate to less than 1e-12,which effectively alleviates the problem of light intensity scintillation caused by atmospheric turbulence.The actual received energy is greater than the detector threshold,which further verifies the feasibility of the system.