利用差分GNSS获取高精度无人机影像外方位线元素

目前,微小型无人机遥感系统定位精度低,需要布设大量地面控制点,才能满足空三和测图精度要求,为提高无人机遥感系统影像的后期处理效率,文中研究利用差分GNSS模块,结合后差分算法提高POS数据精度,并通过位置标定、相机时间延迟改正等关键技术方法开展研究,最终获得高精度相机曝光时刻的位置信息,以此为基础,集成一套基于差分GNSS的无人机遥感系统。通过实验,最终实现以少量地面控制点获取高精度无人机影像外方位线元素,提高无人机影像后期处理效率,具有一定工程应用价值。

The use of differential GNSS to obtain high-precision UAV image line of exterior orientation elements

At present,a miniature UAV remote sensing system of low positioning accuracy needs a large number of ground control points,in order to meet the three empty and the mapping accuracy requirement.In order to improve the post processing efficiency of UAV remote sensing image system,this paper studies the use of differential GNSS module,combined with the difference algorithm to improve the accuracy of POS data.The calibration of position ard the camera time delay correction method of key technology can obtain the position information of high precision camera exposure time.So a set of integrated differential GNSS is formed based on UAV remote sensing system.Through the experiment,a small number of ground control points are used to obtain the high accuracy UAV image line elements,which can improve the efficiency of image processing.