Research On Pulse Delay Based On Underwater Laser Timing Technology

The accuracy of the clock is the basis for the operation of most of the current digital communication equipment.For the complex environment of underwater links,the timing accuracy will directly affect whether the underwater communication equipment can operate accurately and efficiently.Therefore,the analysis of underwater laser timing technology is an important research content for future underwater equipment communication operations.In this thesis,from the perspective of exploring the arrival delay of timing pulses,considering the parameters of seawater environment,light source and communication equipment,the influence of various factors on the jitter of the arrival time of underwater laser timing pulses is analyzed.The main contents of the research are as follows:Firstly,the influence of seawater environment on laser transmission is analyzed,the influence of ocean turbulence on photon transmission is added to the underwater laser channel model based on Monte Carlo method,and more channel simulation models influenced by seawater environmental factors are established.The traditional Monte Carlo simulation statistical method analyzes the state of the beam at the receiving end based on the photon scattering of seawater particles,and does not consider the influence of the seawater turbulent environment on the photon scattering disturbance.Therefore,this paper combines the phase screen method on the basis of the Monte Carlo simulation statistical method.,the influence factors of ocean turbulence are added to the numerical statistics of underwater photon scattering,and the laser channel models under these two different influence environments are fused.Secondly,according to the transmission characteristics of optical soliton with longer transmission distance and less beam loss in wired fiber,optical soliton is introduced into underwater wireless laser communication,and the transmission performance of traditional Gaussian beam and optical soliton beam in different underwater environments is compared and analyzed.According to the beam receiving characteristics and time delay distribution characteristics,it is concluded that the optical soliton has better communication performance and pulse anti-jitter performance in the underwater link,and is more suitable for the application of underwater laser timing.Finally,based on the optimized channel model proposed in this thesis,the distribution characteristics of the arrival delay of timing pulses in different waters,strong and weak turbulent environments,different receiving apertures,and different receiving fields of view under different transmission distances are simulated and analyzed,and the design is based on MATLAB software.A set of pulse arrival delay calculation software is developed to provide reference for underwater laser timing technology.To sum up,this thesis mainly studies the pulse arrival delay of underwater laser timing technology,including the optimization of channel model,the selection of light source and the analysis of various influencing factors of timing delay jitter.Provide theoretical reference for the timing technology of future underwater operation equipment.