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在大气激光通信中,大气湍流所引起的光强闪烁会严重影响通信系统的性能,导致系统误码率的增加,多孔径接收是克服这种影响的有效方法。主要分析了3个孔径的接收性能,并对比了多个接收孔径的接收面积的大小及相互之间的位置关系对空间平滑因子的影响,对比了多孔径接收与单孔径接收的孔径平滑因子;利用Gamma-Gamma信道模型分别从弱至强湍流区光强起伏概率密度函数分析了多孔径接收系统的误码率特性。结果表明,多孔径接收系统可以更好地改善接收面的光强起伏,降低系统的误码率,并且随着接收孔径数目的增加,系统的孔径平滑因子和误码率会进一步降低。
In atmospheric laser communication, the flickering of light intensity caused by atmospheric turbulence will seriously affect the performance of the communication system, resulting in an increase of system error rate. Multi-aperture receiving is an effective way to overcome this effect. This paper mainly analyzes the receiving performance of three apertures, and compares the size of the receiving area of multiple receiving apertures and the influence of mutual positional relationship on the spatial smoothing factor. The aperture smoothing factor of multi-aperture receiving and single aperture receiving is compared. The Gamma-Gamma channel model was used to analyze the bit error rate (BER) characteristics of multi-aperture receiver systems from the probability density function of light intensity fluctuation in the weak to strong turbulence region. The results show that the multi-aperture receiving system can better improve the light intensity fluctuation of the receiving surface and reduce the error rate of the system. With the increase of the number of receiving apertures, the aperture smoothing factor and bit error rate of the system are further reduced.