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Fading statistics for intersatellite optical communication

机译:卫星间光通信的衰落统计

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The narrow beam widths associated with intersatellite optical communication links make such links susceptible to signal fading because of pointing jitter. Such fading can be aggravated by stationary offsets in pointing. We calculated the fade rates for the case of two spaceborne telescopes having Gaussian beam profiles, a pointing offset, and pointing jitter that can be described by Gaussian statistics. An integral solution is derived for the general case of a nonsymmetrical system, with and without pointing bias, and closed-form solutions are presented for the case of a symmetrical system (identical platforms and optics). These results show that, for a system with 3-dB margin, the rms pointing jitter must be held to less than 7% of the full beam width to keep the fade rate below once per year. (C) 1997 Optical Society of America.
机译:由于指向抖动,与卫星间光通信链路相关的窄波束宽度使此类链路易于发生信号衰落。指向中的固定偏移会加剧这种褪色。我们计算了两个具有高斯光束轮廓,指向偏移和指向抖动的星载望远镜的衰落率,这可以用高斯统计来描述。对于具有和不具有指向偏差的非对称系统的一般情况,得出了积分解,对于对称系统(相同的平台和光学器件),给出了闭式解。这些结果表明,对于具有3dB余量的系统,必须将均方根指向抖动保持在整个波束宽度的7%以下,以使衰减率每年保持低于一次。 (C)1997年美国眼镜学会。

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