双频GPS辅助低空航摄大比例尺空三精度分析

Accuracy Analysis of Dual Frequency GPS-supported Low-altitude Photogrammetry in Large Scale Aerotriangulation

针对双频GPS辅助低空摄影测量仍需大量野外控制点布测的问题,通过对飞控系统与相机集成改造,而后对双频GPS有无反馈信息以及不同控制点个数对大比例尺测图空三精度的影响分析,提出一种双频GPS辅助低空摄影测量最优化的解决方案,最大限度减少野外控制点布测数量,从而减少外业工作量。利用轻小型无人机航空遥感系统开展了福建省溪柄镇1∶2 000航空摄影测量试验,并重点分析了双频GPS在相机反馈前后对测区零加入或加入不同个控制点开展双频GPS辅助低空摄影测量对大比例尺测图空三精度的影响。试验表明,在相机反馈后双频GPS辅助大比例尺测图空三时加入6个地面控制点即可满足1∶2 000比例尺测图空三的要求。

According to the problem that a large number of field control points are still needed for dual frequency GPS assisted low altitude photogrammetry,this paper integrated and transformed the flight control system and camera,and then analyzed the effect on the aerial triangulation accuracy of large scale mapping from having or not feedback information of dual frequency GPS and the number of different control points,and proposed an optimized solution to minimize the number of field control points in order to reduce the workload of the field.This paper used light miniature UAV remote sensing system to develop1∶2000photogrammetry test in Xibing town of Fujian province after finishing the integration reform of flight control system and camera,and mainly analyzed the effect on accuracy of dual frequency GPS supported large scale topographic mapping when no or different number control points were set in survey area front and back of camera feedback.The result showed that six ground control points set in dual frequency GPS supported large scale aerotriangulation would meet the accuracy demand of1∶2000scale aerotriangulation after camera feedback.