无人机大比例尺免像控关键技术探讨

Discussion on key technology of large scale image free control for UAV

针对无人机摄影飞行速度不稳定导致影像获取时刻曝光误差不统一问题,提出无人机大比例尺免像控方法.首先,探讨分析影像镜头畸变误差模型以及曝光延迟带来无人机曝光未同步问题;然后,对传统的GPS辅助光束法平差模型中引入曝光延迟模型,提出引入曝光延迟的GPS辅助光束法平差方法;最后,以工程实例验证该方法的有效性,实验结果表明本文方法可以在无像控点参与情况下满足1∶500的大比例测图精度要求.

Absrtact:Aiming at the problem that the time exposure error of image acquisition is not uniform due to the unstable flight speed of UAV photography,a large-scale image free control method for UAV is proposed.First of all,this paper discusses the analysis of the camera lens distortion error model and the problem that the exposure of UAV is not synchronized due to the exposure delay.Then,the exposure delay model is introduced into the traditional GPS auxiliary beam method adjustment model,and a GPS auxiliary beam method adjustment method with the exposure delay is proposed.Finally,the effectiveness of this method is verified by an engineering example.The experimental results show that this method can be used in the UAV when the control point is involved,thus it can meet the accuracy requirement of 1∶500 large scale mapping.