军用相变型光学头伺服方法的研究

On the Focusing and Tracking Servoes in a Military Optic Head of the Phase-Change Type

对军用相变型光学头中所采用的聚焦和轨道伺服方法（即临界角法聚焦伺服和推挽法轨道伺服）进行了理论分析，建立了伺服信号的数学模型，并对伺服范围进行了讨论。根据军用要求，提出了改善伺服信号质量、拓宽伺服范围的方法。

The methods of focusing servo and tracking servo for use in a military phase-change optichead are analyzed.A mathematical model for the servo signal is developed and the servo range is dis-cussed.Based on an analysis of the military environment and requitements of military application,asecond-level reinforcing design scheme for the servo system is proposed.For the internal reinforce-ment,the multi-transmission method is adopted to improve the gain and the sensitivity of the servosignal of the focusing error,the processing circuits are used to compensate for the linearity of the de-tection signal and the method of widening the servo range is suggested.