Fine Tracking Control Algorithm of Polarimetry-double Reflection Structure in the Satellite Based Quantum Key Distribution Terminal
Zhang Hong-g · Acta Sinica Quantum Optica · 2014
The polarization of reflected light was studied when the polarimetry-double reflection structure was used as a fine tracking system in the satellite based quantum key distribution terminal.The polarization variation of reflected light caused by the inconformity of two light plans(which was confirmed by incident light and reflected light)was analyzed.The quantum bit error rate was calculated.Base on the characteristics of this reflection structure,the relationship between the normal directions of two mirrors and the vectors of incident light and reflected light was given.The control algorithm was presented when this reflection structure was used as a fine tracking mirror.