基于InSAR的无人机DEM底图构建方法及应用研究

Construction Method and Application of UAV DEM Based on InSAR

在高差较大的高山地区采用定高飞行获取航摄数据通常无法满足航摄数字产品的生产,为解决此类问题,通常采用无人机仿地飞行技术,进行地形数据采集,但目前无人机仿地飞行DEM底图通常采用预飞或开放的DEM数据,预飞的方式成本较大,开放的DEM现势性较差且精度和分辨率不足,易造成仿地航线设计不准确。利用InSAR技术构建DEM底图,研究和分析InSAR技术提取DEM的关键技术环节,对InSAR DEM和LiDAR DEM进行对比分析,结果显示该技术可得到分辨率优于15 m,绝对精度优于30 m的DEM底图,并用此DEM进行仿地航线设计,结果表明能满足实际无人机仿地飞行的底图要求。

In mountain areas of elevation adopts fixed high flying obtain aerial data often cannot meet the production of aerial digital products,in order to solve such problem,usually adopts the technology of unmanned aerial vehicle(UAV)copy to flight,for terrain data acquisition,but the UAVs to fly imitation DEM(digital elevation model)usually adopts the preflight reproduction or open DEM data,preflight way cost is larger,Open DEM has poor current situation and insufficient precision and resolution,which is easy to cause the inaccuracy of the land-imitation route design.This paper uses InSAR technology to construct DEM base map,studies and analyzes the key technical links of InSAR technology to extract DEM,and makes a comparative analysis of InSAR DEM and LiDAR DEM.The results show that the DEM base map with resolution better than 15 m and absolute accuracy better than 30 m can be obtained by this technology.The DEM is used to design the ground imitation flight path,and the results show that it can meet the base map requirements of the ground imitation flight of the actual UAV.