远程红外探测系统瞄准线高精度稳定技术

Line-of-sight high-precision stabilization technology of remote infrared detection system

瞄准线稳定精度是远程红外探测系统的关键指标之一,主要由伺服环路带宽和隔离度决定。介绍了远程红外探测系统的组成,分析了基于FSM的二级稳定技术的原理,建立了粗级稳定平台机电模型、精级稳定平台机电模型和光学传递函数模型,最终搭建了二级稳定伺服控制系统数学模型,通过分析带宽和隔离度传递函数,提出了扰动全补偿的边界条件,同时分析了影响稳定带宽和隔离度的主要因素,对比了二级稳定和传统稳定的稳定效果。仿真结果显示,系统速率稳定回路带宽提升至200 Hz,1 Hz隔离度可达-66 d B,实际测试稳定精度达到12μrad,满足远程红外探测系统对于稳定精度的要求。

Stabilization accuracy of the line﹣of﹣sight is one of the key specifications of the remote infrared detection system, which is mainly determined by the servo loop bandwidth and isolation. In this paper the composition of the remote infrared detection system was described, the principle of two﹣level stabilization techniques based on FSM was analyzed, coarse stable platform electromechanical model, fine stable platform electromechanical model, the optical transfer function model and the control system transfer function were established, through the analysis of bandwidth and isolation transfer function, the boundary conditions of the disturbance compensation were explained in detail, stabilized ability of the two﹣level stabilization and common stabilization were contrastly analyzed. Simulation results show that the bandwidth of stabilization loop reaches about 200 Hz, isolation is superior to - 66 dB at 1 Hz, Stabilization accuracy reached 12μrad by actual test, meet the requirements of remote infrared detection system for stabilization accuracy.