| Full use of knowledge of wireless communication technology theory and communication transmission technology, physics, statistics,some key transmission technologies of laser atmosphere communication at sea are researched based on lots of theoretical analysis and experimental validation. A multi-beam propagation channel model at sea based on laser communications system parameters(weak turbulence and strong turbulence) is established for typical MIMO system.The relationship between intensity fluctuation and error rate caused by atmospheric turbulence is derived by perturbation method and signal detection theory.Turbo is applied as channel coding to overcome influence of fog to the communication system. The mathematical model of outage probability under different atmospheric turbulence is built.The corresponding ATP system and workflow is designed and servo system principles is elaborated. The error signal processing model under the uniform beam spot and the Gaussian is built. Effective ways to improve position accuracy of QD are given. |
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