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Yong Wang – One of the best experts on this subject based on the ideXlab platform.

  • The Study on Non-Line-of-Sight Ultraviolet Communication System in the Atmospheric Turbulence
    Applied Mechanics and Materials, 2014
    Co-Authors: Yong Wang

    Abstract:

    In the Atmospheric Turbulence, the effects of Atmospheric Turbulence and transmitted optical power on the BER performance of ultraviolet communication system are analyzed and simulated. The simulation results show that when the Atmospheric Turbulence strength changes from weak to strong, the BER performance deteriorates along. Compared to OOK intensity modulation, the BPSK subcarrier intensity modulation can be more effectively to inhibit Atmospheric Turbulence effect on ultraviolet communication system. Under the certain Atmospheric Turbulence strength, the BER performance of ultraviolet communication system will be improved along with the increase of the transmitted optical power.

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  • Analysis on the Effects of Atmospheric Turbulence on Line-of-Sight Ultraviolet Communication System Performance
    Advanced Materials Research, 2014
    Co-Authors: Yong Wang

    Abstract:

    In the ultraviolet communication system, optical signals being transmitted are not only attenuated in energy, but also affected by the Atmospheric Turbulence. The effects of Atmospheric Turbulence intensity and information transmission rate on the BER performance of UV communication system are analyzed and simulated in this paper. It can be found that when the Atmospheric Turbulence intensity changes from weak to strong, the BER performance deteriorates along, and under the certain Atmospheric Turbulence intensity, information transmission rate will also have an impact on the system BER performance, the information transmission rate becomes faster, the BER performance gets worse.

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Xiaomei Chen – One of the best experts on this subject based on the ideXlab platform.

  • Analysis and modeling of Atmospheric Turbulence on the high-resolution space optical systems
    8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test Measurement Technology and Equipment, 2016
    Co-Authors: Jiang Lili, Xiaomei Chen

    Abstract:

    Modeling and simulation of optical remote sensing system plays an unslightable role in remote sensing mission
    predictions, imaging system design, image quality assessment. It has already become a hot research topic at home and
    abroad. Atmospheric Turbulence influence on optical systems is attached more and more importance to as technologies of
    remote sensing are developed. In order to study the influence of Atmospheric Turbulence on earth observation system, the
    Atmospheric structure parameter was calculated by using the weak Atmospheric Turbulence model; and the relationship of
    the Atmospheric coherence length and high resolution remote sensing optical system was established; then the influence
    of Atmospheric Turbulence on the coefficient r0h of optical remote sensing system of ground resolution was derived;
    finally different orbit height of high resolution optical system imaging quality affected by Atmospheric Turbulence was
    analyzed. Results show that the influence of Atmospheric Turbulence on the high resolution remote sensing optical system,
    the resolution of which has reached sub meter level meter or even the 0.5m, 0.35m and even 0.15m ultra in recent years,
    image quality will be quite serious. In the above situation, the influence of the Atmospheric Turbulence must be corrected.
    Simulation algorithms of PSF are presented based on the above results. Experiment and analytical results are posted.

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  • Image resolution analysis of Atmospheric Turbulence on the high-resolution space optical systems
    2015 International Conference on Optical Instruments and Technology: Advanced Lasers and Applications, 2015
    Co-Authors: Lili Jiang, Xiaomei Chen

    Abstract:

    In order to study the influence of Atmospheric Turbulence on earth observation system, the Atmospheric structure parameter was calculated by using the weak Atmospheric Turbulence model; and the relationship of the Atmospheric coherence length and high resolution remote sensing optical system was established; then the influence of Atmospheric Turbulence on the coefficient r0h of optical remote sensing system of ground resolution was derived; finally different orbit height of high resolution optical system imaging quality affected by Atmospheric Turbulence was analyzed. Results show that the influence of Atmospheric Turbulence on the high resolution remote sensing optical system, the resolution of which has reached sub meter level meter or even the 0.5m, 0.35m and even 0.15m ultra in recent years, image quality will be quite serious. In the above situation, the influence of the Atmospheric Turbulence must be corrected.

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Rod Frehlich – One of the best experts on this subject based on the ideXlab platform.

  • Atmospheric Turbulence component of the innovation covariance
    Quarterly Journal of the Royal Meteorological Society, 2008
    Co-Authors: Rod Frehlich

    Abstract:

    The innovation covariance is derived for general Atmospheric Turbulence conditions and for climatologies of upper-level Turbulence based on aircraft data. Error is defined in terms of the effective spatial filter of the forecast model to produce a consistent definition of measurement error and model error. Calculations of the Atmospheric Turbulence component (observation sampling-error covariance) are performed for rawinsonde data and various forecast model resolutions. Significant contributions from the Atmospheric Turbulence field are produced, especially for the older forecast models. Copyright © 2008 Royal Meteorological Society

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  • Measurements of the Atmospheric Turbulence spectrum and intermittency using laser scintillation
    Propagation Engineering: Fourth in a Series, 1991
    Co-Authors: Rod Frehlich

    Abstract:

    Simultaneous measurements of the spatial intensity covariance of laser scintillation and the variance of integrated intensity collected by multiple circular apertures provide sufficient information to determine the form of the Atmospheric Turbulence spectrum over short spatial and temporal scales. This ensures local stationary of the Turbulence. The estimated parameters of the Turbulence spectrum (level of Turbulence C2n and inner scale) over these stationary events provide accurate estimates of the intermittency of Atmospheric Turbulence. The advantages of laser scintillation measurements include spatial averaging that improves statistical accuracy, true measurements of spatial statistics without the need to convert temporal statistics to spatial using Taylor’s hypothesis, remote sensing of Atmospheric Turbulence which reduces contamination by support structures, and rugged instrumentation for reliable measurements. New uses of laser scintillation measurements will be discussed.© (1991) COPYRIGHT SPIE–The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

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