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Modeling And Simulation Analysis Of Atmospheric Turbulence Effects On Satellite Ground Laser Communication

Posted on:2018-06-10Degree:MasterType:Thesis
Country:ChinaCandidate:Y S ZhouFull Text:PDF
GTID:2348330515996515Subject:Atmospheric physics and atmospheric environment
Abstract/Summary:PDF Full Text Request
Compared with the traditional microwave communication,laser communication has the advantages of wide bandwidth,high transmission rate,good security,thus it has become a hot research topic in recent years.But in the satellite to ground laser communication link,the random change of the refractive index caused by turbulence will cause the fluctuation of the light intensity and the phase fluctuation of the receiver.Therefore,it is of great significance to study the effect of atmospheric turbulence on the bit error rate of satellite to ground laser communication.The experimental study of this problem needs a long cycle and high cost,besides it is very difficult to obtain the accurate results by the theoretical analysis because of too many parameters.Therefore,this paper uses simulation method to study this problem.This paper focuses on the model and numerical simulation of atmospheric optical turbulence affecting the whole atmosphere propagation of Gauss signal.And this paper analyzes the BER of satellite-ground communication systems in BPSK coherent or non coherent OOK detection methods,with or without the adaptive optics correction systems.Gaussian beam is emitted from the geostationary orbit satellite at a certain zenith angle through the vacuum transmission and atmospheric transmission to the receiving end of the ground station.The atmospheric turbulence in atmospheric turbulence model is stratified by Rytov variance,and a random phase screen generated by fast Fourier transformation is inserted between each layer of turbulence,and the beam is transmitted between 32 phase screens to obtain the complex amplitude of the beam.Then,the results are tested by using the scintillation index of plane wave and the probability density of light intensity.Finally,the bit error rate model are deduced for non coherent optical communication system OOK modulation and coherent BPSK modulation,the transmission laser downlink star into the BER model to obtain the effect of atmospheric turbulence on BER.At the same time,the improvement of the communication performance of the adaptive optical system is analyzed by using Zernike polynomial phase compensation.The simulation model of bit error rate established in this paper has reference value to development of satellite-to-ground laser communications system,and it can provide an important theoretical basis for the selection of communication detections,modulations,transmitters,receivers and so on.Therefore,the research results of this paper have important guiding significance and reference value.
Keywords/Search Tags:Satellite-to-ground laser communication, atmospheric turbulence, random phase screen, numerical simulation, bit error rate
PDF Full Text Request
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