Small Aerial Survey Drone Construction And Aerial Survey Application

In recent years,the low altitude digital aero photogrammetry technology of unmanned UAV has developed rapidly with its unique advantages.The low altitude digital aerial photography of the UAV is convenient,flexible,low cost,and can operate under the cloud layer.It is less affected by weather and cloud layer.It is an important complement to common aeronautical and aerial photography and satellite remote sensing technology,and has become an essential technology in remote sensing and photogrammetry.It can play an important role in small area,difficult area mapping and emergency emergency surveying and mapping support.It can quickly acquire high-resolution digital images in the target area to make digital orthophoto and large scale topographic map and other mapping products.The purpose of the difference is to eliminate the public error and improve the positioning accuracy.The unmanned UAV loaded with differential systems can reduce the number of ground control points and greatly reduce the late cost when used for aerial survey.It also improves the accuracy of post processing.This paper will take the consumption level aviation model as the carrier,carry the digital camera,and build a low-cost,easy to operate aerial image measurement system with differential system.Based on that,we will complete the aerial photogrammetry and check the image quality and analyze the accuracy of aerial survey.The main work and results of this article can be summed up as follows:1.The theoretical model used in the differential positioning is introduced.After Calman filtering method calculates the position information of each epoch collected difference data,three-dimensional coordinates of the location information through the centroid of the Lagrange interpolation method calculates the instantaneous image exposure.The application of the centroid Lagrange interpolation method to the standardization of GNSS orbit is further applied to the GNSS post differential data processing.2.Build a differential system module.The highly centralized dual frequency GNSS receiver chip is designed to design the I/O(board)device to control the operation of the hardware.To ensure that the collected data can be effectively transmitted to the receiver chip,the chips are processed initially,and then broadcast to the board,and the data are sent out by the differential card.The circuit board developed in this experiment is designed to meet the characteristics of the UAV.The volume of any differential plate that is sold on the market is smaller than that of the market.It embodies the characteristics of lighter weight,smaller volume and lower power consumption.It overcomes the three difficult problems of UAV itself,that is,the problem of small load,small space and poor endurance.It also greatly reduces the cost of equipment and improves the practical value.3.A set of differential data processing software is written for the aerial survey differential module.The differential data received by the differential module carried by the aerial survey UAV is processed by this software,and the results are applied to the later image data processing.The fixed rate is compared with the result calculated by the differential decomposition data and the same difference software in the market of Wuhan.The fixed rate is better than the market 3.78%.4.Through the design of route,unmanned aerial vehicle acquisition data,differential software to solve data,image data processing,the control points are divided into two groups to carry out the experiment.Through the empty three encryption,the control point and the inspection point precision information are derived.A comparative analysis shows that using GNSS aided beam area adjustment method can reduce the number of 70% control points,save cost and improve work efficiency than traditional aerial survey method.