给出了一种红外搜索与跟踪(IRST)系统中红外指向器的设计方案,在分析了IRST系统及指向器整体特点的基础上,着重讨论了红外指向器各组成部分的工作原理及设计方案.红外搜索与跟踪系统要求目标搜索范围大、周期短、系统反应时间短,同时还要求体积小、质量轻,并尽可能降低成本.为了达到以上目的,采用了六棱台转鼓结合双面翻转反射镜扫描光路的方案,较好地达到IRST系统的各项指标要求.对伺服控制系统的设计是根据不同组件对速度、位置精度的要求选用合适的驱动电机、编码器与控制方法,力求满足精度要求的同时做到体积小、成本低.实验证明,此红外指向器技术先进,方案合理,其性能达到了IRST系统的各项指标要求,目标搜索实验效果良好.采用巧妙的设计方案有效解决了IRST系统大视场快速扫描与轻小型化、低成本化的问题。

An optical director design of the infrared search and track （IRST） system is proposed. After analyzing characters of the IRST system and its optical director,the compositions and functions of the optical director of the IRST system are described.IRST system requires a large search field, a short search period and response time. In order to get these effects, this scheme scans the search field with mirror polygon combining overturn mirror, by this means,it is able to meet all demands of an IRST system. With regard to the control system,different electromotors, encoders and control methods are applied according to different requirements for position and speed of each component to reduce volume and cost at the same time to meet the precision demand.Testified by experiments, this infrared optical director has advanced technology and rational scheme and can well meet all demands of an IRST system. The experiments of searching targets have excellent results. An innovation of this paper is that it resolves effectively the conflict between the demand for the large-field and rapid search and the demand for the small volume and the low cost.