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从描述像空间坐标与物理空间坐标关系的共线方程出发,推导出单相机迎角测量中模型迎角关于相机外方位元素的计算公式。在单相机迎角测量中模型表面标记点展向坐标Y不变的假设下,研究了2m量级风洞中,相机位于5个不同位置时,3个角外方位元素(φ,ω,κ)和模型侧滑角β在-2°～2°之间振动对迎角测量结果的影响。模拟结果表明:φ和κ的振动对迎角测量结果影响较大,且该影响对相机位置和模型迎角的变化不敏感;在相机位于法向投影位置(相机光轴与Y轴平行)时,ω与β的振动对迎角测量结果影响非常小,可以忽略,但影响量随相机位置偏离法向投影位置迅速增加。
Starting from the collinear equation that describes the relationship between space coordinates and physical space coordinates, the formula of the attack angle on the outside of the camera in the single-camera angle of attack measurement is deduced. Under the assumption that the coordinate Y of the model surface is invariant in single-camera angle of attack measurement, when the camera is located at 5 different positions in 2 m wind tunnel, the three azimuthal orientations (φ, ω, κ ) And model side slip angle β between -2 ° ~ 2 ° on the angle of attack measurement results. The simulation results show that the vibration of φ and κ have a great influence on the angle of attack measurement, and the influence is not sensitive to the change of the camera position and the angle of attack of the model. When the camera is located at the normal projection position (the optical axis of the camera is parallel to the Y axis) The influence of ω and β vibration on the angle of attack measurement is negligible, but the amount of influence increases rapidly with the position of the camera deviating from the normal projection position.