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中文摘要：
以部分相干的电磁高斯．谢尔模型（electromagnetic Gaussian-Schell model，EGSM）光束为研究对象，根据相干和偏振的统一理论以及随机光束的Stokes参量，推导出EGSM光束在大气湍流中斜程传输时的偏振度（degree of polarization，DoP）和偏振方向角的表达式，研究了大气湍流中上行和下行传输时EGSM光束偏振特性的不同．研究结果表明：在相同条件下，EGSM光束下行传输时整个光场DoP的分布比上行传输要集中：下行传输时轴上点的DoP达到最大值所对应的传输距离长于上行传输．可以看出，EGSM光束沿下行路径传输时，探测器可以接收更远距离处的波束传输信息．
英文摘要：
In this article, we take partially coherent electromagnetic Gaussian-Schell model （EGSM） beam as a research object. Based on the unified theory of coherence and polarization and the generalized Stokes parameters of random electromagnetic beams, the expressions of degree of polarization （DoP） and orientation angle of EGSM beam that propagates in the slant atmospheric turbulence, are derived. And the expressions are used to investigate the difference in polarization property of EGSM beam between propagating along an uplink path and a downlink path in the atmospheric turbulence. The results show that under the same conditions, the DoP distribution of EGSM beam propagating along a downlink path is more concentrated than that along an uplink path. When EGSM beam propagates along a downlink path, the maximum DoP corresponding to the propagation distance is larger than along an uplink. Therefore, when EGSM beam propagates along a downlink path, the detector can receive beam information at the longer distances.
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