关键词: 飞行器实验技术, 光学测量, 角位移, 单目视觉, 特征直径, 亚像素处理方法

Abstract: Before flight test, the airplane’s rudder angular displacement sensor needs to be calibrated. The calibration can be based on monocular vision. The test target’s mark is a circle with a centre indicated by the intersection of two lines. The target is fixed on the rudder face, parallel to the rudder axis, and its pictures are taken with a fixed digital-camera. The pictures can be processed by using sub-pixel processing method proposed in this paper. The image point of circle centre, the elliptic equation and its minor axis’s endpoints can be found out. Thus, the target’s plane equation can be obtained also. Then, the rudder angular displacement can be expressed by that of the target. When elliptic was added Gaussian noise with μ=0 and σ=2pixel, simulation results show that the angular displacement errors are within 0.06°. The angular displacement errors caused by the target deviation from the rudder axis can be corrected.

Key words: experimental technology of aerocraft, optical measurement, angular displacement, monocular vision, characteristic diameter, sub-pixel processing method