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 communications, light intensity flashing caused by turbulence severely interferes the performance of communication system and increases the bit error rate (BER) of the system. Multi-aperture reception is the effective method to overcome the above interference. The reception areas of multi apertures and the effect of aperture position relation on space smoothing factor are analyzed. The reception performance of three apertures, is mainly analyzed and smoothing factor of multi-aperture reception is compared with that of single-aperture reception. The probability density function of light intensity fluctuation deriving from the Gamma-Gamma channel modeling from weak turbulence band to strong turbulence band is deployed to analyze the BER of multi-aperture reception system. The result shows that multi-aperture reception system can better improve the light intensity fluctuation of reception area and decrease system′s BER. With the increase of the number of aperture, the aperture smoothing factor and BER will be decreased.