【摘要】 星地激光通信的关键问题是克服大气湍流效应对激光载波信号传输的影响。信号光束经过长距离大气信道传输后,相位不完整,波面受到畸变,导致接收端系统在解调信号过程中,通信误码率降低。根据国内外星地激光通信的研究进展和实验情况,介绍了几种克服大气湍流效应对高速率星地相干通信影响的方法及其原理。重点分析基于差分相移键控(DPSK)调制和干涉原理的相干探测技术在解调相位信息时克服大气湍流效应方面的优势,并对其进行了总结和展望。更多还原

【Abstract】 The key problem in the satellite-to-ground laser communication is primarily to mitigate the effect of atmospheric turbulence.After propagating through the atmosphere with a long distance,the wave-front distortion of signal light brings about the degradation of bit error rate(BER).The experimental development of the satelliteto-ground laser communication based on the domestic and abroad research progress is described.Some effective methods and discusses to overcome the turbulence effect on the high rate communication are presented.Finally,coherent detection technology based on interference principle and differentical phase shift keying(DPSK) modulation is emphatically analyzed in the phase demodulation,and the advantages are summarized.It is predictable that this technology will become more practical and play an important role in its application areas.更多还原