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首页> 外文会议>Free-Space Laser Communications VI >Coherent effects and aperture averaging in retroreflected light
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Coherent effects and aperture averaging in retroreflected light

机译：后向反射光的相干效应和孔径平均

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An experimental study has been made on the contribution to the effective scintillation index due to two retroreflectors, as a function of retroreflector spacing. For closely spaced retroreflectors the effect of coherent interference at the receiver is seen to increase the effective variance of the received signal, whereas spatial averaging is apparent for more widely spaced retroreflectors. The scintillation index, probability density functions, power spectral densities and fade rates are all affected by the interference. The range, under which these experiments were conducted, was typically 500 - 800m over mixed water/land terrains. The interrogator used a monostatic, 1550nm laser probe beam with a divergence of 0.4 mrad and had a 50mm diameter receiver aperture. Data sets of received power were recorded for durations of 10s each, using a photodiode with a bandwidth of 100kHz. For comparison, the received power from a single retroreflector at various radial positions in the probe beam was recorded. Knowledge of the fade rates and fade durations is of practical importance in considerations regarding the optimal transmission of data packets.
机译：已经进行了关于两个后向反射器对有效闪烁指数的贡献作为后向反射器间距的函数的实验研究。对于间隔较近的后向反射镜，可以看到接收机处的相干干扰效应会增加接收信号的有效方差，而对于间隔较宽的后向反射镜，空间平均是显而易见的。闪烁指数，概率密度函数，功率谱密度和衰落率均受干扰影响。进行这些实验的范围通常在水/陆混合地形上为500-800m。该询问器使用了15mAnm的单静态激光探头光束，其发散度为0.4 mrad，接收器直径为50mm。使用带宽为100kHz的光电二极管记录接收功率的数据集，每个数据集的持续时间为10s。为了进行比较，记录了来自单个后向反射器在探测光束中各个径向位置的接收功率。考虑到有关数据分组的最佳传输，了解衰落速率和衰落持续时间具有实际重要性。

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