摘要
基于高分辨率数字图像处理的近景摄影测量技术应用于轨道检测是一种有望提高轨道测量效率的新方法,但目前该方法存在摄影中心高程和摄影基线长度在平差计算过程中出现波动的问题。提出一种在近景摄影轨道检测中引入相对几何控制的新方法,利用近景影像范围内轨道坡度平滑特性和两台相机摄影基线长度固定作为相对控制条件,联合开展区域网轨道平差计算。实验计算表明,与常规无相对控制的光束法平差比较,引入相对控制条件显著降低了摄影中心高程波动和摄影基线长度变化,并在稀疏控制条件下大幅度提高了平差解算精度。结果表明:提出的引入相对控制近景摄影轨道检测方法较好地解决了平差计算过程中的未知数波动问题,为高速铁路车载近景摄影轨道几何检测提供了新的约束解算思路。
The close-range photogrammetry with high resolution digital images has been approved to be an efficient method to detect the geometry of high-speed railway track.But there are some obstacles with respect to this method during practical data adjustment processing due to the significant change in the center height of camera and the length of photogrammetric baselines.This paper proposed a new method of introducing relative geometric control in close-range photogrammetry for track detection.Using the smooth characteristics of track slope in the close-range image and fixed length of photogrammetric baseline as relative control conditions,the regional network track adjustment calculation was jointly carried out.The experiment shows that compared with the conventional beam adjustment without relative control,the use of the relative control conditions can significantly reduce the variation of the center height of camera and the variation of the length of photogrammetric baselines,and greatly improves the data adjustment accuracy even with sparse ground control points.The proposed close-range photogrammetry with relative control constraints can well solve the problem of parameter fluctuation during adjustment calculation,which provides a good solution for improving the accuracy of track examination in onboard close-range photogrammetry.
作者
陈强
赵晶晶
卢冬冬
彭卫平
刘丽瑶
杨莹辉
CHEN Qiang;ZHAO Jingjing;LU Dongdong;PENG Weiping;LIU Liyao;YANG Yinghui(Department of Surveying and Geo-Informatics,Southwest Jiaotong University,Chengdu 610031,China)
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2021年第4期136-141,共6页
Journal of the China Railway Society
关键词
相对控制
近景摄影测量
轨道测量
检测精度
relative control
close-range photogrammetry
track geometry examination
measurement accuracy
