变基线数字航空摄影航线设计与飞行控制——基于DEM的设计方法

Course program and control of variational baseline digital aerial photography based on DEM

传统摄影测量都是采用等基线摄影测量的方式,等基线的航空摄影作业对于平坦地区具有较强的适应性,但是在丘陵、山区等作业区域高程起伏较大的地区,高程的起伏会影响到相邻航空影像的航向重叠度和旁向重叠度。为了解决这一问题,详细阐述了基于曝光点调整法的变基线航线设计方法,该方法是基于1:25万的DEM实现的。实现变基线航空摄影测量的基础是实现高精度定点曝光,重点介绍了智能定点曝光算法,及如何解决利用GPS动态定位时的信号不正常、卫星失锁和GPS坐标跳跃等问题。

Usually, the baseline in traditional photogrammetry is equidistant. In the plain region, the aerial photography with equidistant baseline is adaptive, but in the hills, mountains and other largely fluctuated regions, the elevation fluctuation influence the overlap rate on the forward and lateral direction. A variational baseline design of the course based on 1：250000 DEM and high accuracy position exposure in which the error is less than 5 meters or 2% of the baseline distance is expounded. The method so called exposure point adjustment is taken to design DEM- based variable baseline. It emphasizes on intelligent positioning exposure, which solves the problems brought by deviant GPS signals, satellite lost locks or GPS coordinates jumping.