本文讨论了空气隙型光固定衰减器的回波损耗。

This paper discusses the return loss in air-space type fixed optical attenuator.

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推导了雾、霾、云、大气的衰减随高度变化的规律，给出了云层激光回波特性的计算公式。

We get rules of the attenuation of fog, cloud, haze and atmosphere as the height changes, and give the calculation formula of the laser scattering character of cloud layer.

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按照波动理论，在忽略衰减损耗的情况下，回波振幅（ ）。

Based upon wave theory and ignoring attenuation losses, the echo amplitude is.

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