利用摄像测量原理设计出一种新型的轨道几何参数测量系统, 该系统由测量主车和测量靶车两部分组成。测量过程中, 靶车沿轨道向主车运动; 主车上的摄像机实时采集靶车上红外合作标志的序列运动图像; 主车工控机中的软件系统实时提取合作标志在图像中的亚像素位置, 根据合作标志之间的距离和图像清晰度驱动调节摄像机的电动镜头, 使测量过程中摄像机的视场大小基本不变、合作标志成像清晰, 根据相应的模型合成轨道几何参数。静态实验与外场实验结果表明, 该摄像测量系统完全能够满足轨道几何参数高精度测量的需求。

A railway geometry parameters measurement system on the basis of the vidometrics theory is designed. The system consists of two components a measurement bogie and a target bogie. When the measurement procedure is preceded, the target bogie moves towards the measurement bogie along a rail. The camera on the measurement bogie grabs the motion image sequences of the infrared cooperative markers on the target bogie in a real-time manner. At the same time, the software installed in the industrial computer on the measurement bogie locates the sub-pixel positions that the cooperative markers project into the image sequences, and it drives the motorized lens to the correct imaging state according to the distance between the markers and the image definition. Consequently, the viewing field of the camera holds the line and the images of the markers remain definite. Finally, the railway geometric parameters are synthesized from the positions of the markers on the basis of corresponding mathematical model. Both the static and the field experimental results prove that this videometrics measurement system can satisfy the requirement of the high-precision measurement for the rail geometric parameters.