摄影焦距对测量箭体漂移影响的分析

Analysis of Photography Focal Length Influence on Rocket Drift Measuring

高速摄影仪在航天试验靶场中主要用于火箭垂直起飞段的横向漂移测量,它采用近距离、短焦距物镜对火箭进行跟踪测量,任何微小的线量误差将带来较大的测量误差,以致严重影响火箭漂移量的处理精度。为此,建立了高速摄影仪摄影焦距的微量变化对箭体漂移量误差产生影响的数学模型,利用标称数据进行仿真分析,并给出焦距修正系数的计算方法。

High speed photography metrical system is used for measuring vertical takeoff drift of the rocket in test range. The system adopts the short distance, the short focal length objective. Any micro-change of the focal length will bring the bigger measuring error, and even affect the handling precision of rocket drift seriously. So a mathematic model about the error of rocket drift influenced by the micro-change of high speed photographic focal length is established. The simulation is analyzed by using the practice task-data. Moreover, the method of focus correction coefficient calculation is also given.