大孔径接收是克服大气光通信中大气湍流影响的有效途径之一。在有限孔径接收光强起伏理论基础上,建立了平均信噪比与无湍流影响时的探测器输出信噪比、孔径平均因子以及光强起伏方差之间关系的数学模型,并给出了系统误码率计算公式。通过数值计算得出了在给定误码率(BER)设计指标时,不同大气湍流参数条件下,接收孔径直径与无湍流影响时的探测器输出信噪比之间的关系曲线。

Large-aperture receiving is one of the effective approaches to overcome the impact of turbulence on atmospheric optical communications. Based on the irradiance fluctuation theory for finite apertures,the relationship between the average signal-to-noise ratio and the quantities of the signal-to-noise ratio without turbulence,the aperture averaging factor and the irradiance fluctuation variance was mathematically modeled,and the formula of bit error rate (BER) was derived. The curves of relationship between the aperture diameter and the signal-to-noise ratio without turbulence at a given BER with various turbulence parameters were obtained numerically.