Analytic expression of the aperture averaging function for Cassegrain system

摘要

Aperture averaging effect can smooth the optical signal fluctuations. Generally, the aperture function is assumed to be a single circle when its aperture averaging function K0 is calculated. In recent years, K0 function of a complex receiving aperture is also discussed. Actually, Cassegrain system is usually used as a telescope for free-space optical communication. There is a little bit difference from the previous analysis when Cassegrain system is used to analyze aperture averaging effect. K0 function of Cassegrain system is analyzed in this paper. The calculation result can be used to establish simulation model for optical propagation system.