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https://bravikov.wordpress.com/2014/04/16/%d1%80%d0%b0%d0%b7%d0%bd%d0%be%d1%81%d1%82%d1%8c-%d1%84%d0%b0%d0%b7-%d0%bf%d0%be-%d0%be%d1%81%d1%86%d0%b8%d0%bb%d0%bb%d0%be%d0%b3%d1%80%d0%b0%d0%bc%d0%bc%d0%b5/
Расчет разности фаз по времени запаздывания