Research And Application Of Locating Positioning With Range Finder Based On Aerial Triangulation

The UAV has low altitude,high image resolution,short work cycle,high working efficiency,and the advantages of the strong flexibility,has been widely used in surveying and mapping,transportation,military,emergency geographic conditions survey,engineering application,and other fields.A large number of experiments show that the ground resolution can reach the standard,but the elevation accuracy can meet specification requirements when the UAV surveying and mapping 1:500,1:1000 topographic maps.In the presence of UAV aerial elevation error precision,in this paper,based on aerial triangulation technology,through the unmanned aerial vehicle(UAV)platform loading aerial camera and range finder devices to obtain range finder of the laser spot on the ground of three-dimensional coordinates,by comparing the method calculated the checkpoint elevation value and get the elevation values of field layout,in the presented approach are verified the feasibility of point photogrammetry ground elevation accuracy.The article research contents are the following:(1)Outline of the general aerial triangulation process,using the MATLAB toolbox for camera parameter calibration in camera calibration,the distortion of high-speed cameras to extract video frames used for calibration.(2)In this article,through comparison of several common feature points extraction operator,has the scale invariance and rotation invariance is finally your BRISK operator image feature points extraction operator for this article,by comparing the two common matching method,choose better matching of FLANN matching complete image matching method.Then,using the RANSAC algorithm of error matching point to eliminate,ensure the validity of the connection point for regional network model.On the other hand,using the method of beam adjustment reduce the cumulative error of regional network model,and the resulting point cloud data visualization,give a person with intuitive feelings.(3)This paper proposes a method based on pattern matching to calculate the perturbation site coordinates,avoiding the between GPS and aerial camera optical center of geometric error and take photos when the camera is delay,the error of signal transmission,etc,to ensure the time synchronization between GPS and aerial camera.Data obtained through the rangefinder to add to the time of GPS data with the same starting point,completed the GPS data and time synchronization between the rangefinder data.(4)For unmanned aerial vehicle(UAV)loading integration equipment platform,based on the theory of aerial triangulation technique,obtained the experimental space three-dimensional coordinates of laser spot in the area,according to the plane coordinate lofting in the field of a checkpoint this checkpoint,compared with the method calculated the checkpoint elevation value and field layout to get the elevation values,in the presented approach are verified the feasibility of point photogrammetry ground elevation accuracy.