Application technology paper of UAV

Unmanned aerial vehicle is an unmanned aerial vehicle controlled by radio remote control equipment and its own program control device. The following is my carefully recommended UAV application technology paper, hoping to help you.

Application analysis of UAV aerial survey technology

Taking the production project as an example, this paper introduces the application analysis of UAV aerial survey technology with the technical process of UAV aerial survey as the main line.

Unmanned aerial vehicle, aerial survey technology

Taking the production project as an example, this paper introduces the technical process of aerial photography by unmanned aerial vehicle, and analyzes the application of aerial photography by unmanned aerial vehicle.

Key aerial survey technology

China Library Classification. : V279+.2 Document ID:No. A:

Introduction to 0

UAV aerial remote sensing technology is a new type of aerial remote sensing technology developed after satellite remote sensing and aircraft remote sensing, which has been widely used in emergency surveying and mapping support, land and resources monitoring, major engineering construction and other fields. It is a flexible aerial survey technology, which can realize rapid response. However, there are also some problems, such as irregular image overlap, small image frame, large image dip angle, large deflection angle and obvious image distortion, which challenge the existing UAV aerial survey technology.

Based on the production case, this paper analyzes and discusses some problems of aerial survey of UAV in the production process.

Production practice of 1

The main technical basis of 1. 1

Technical Requirements for Aerial Photography System of Unmanned Aerial Vehicles (CH/Z 3002-2010);

Specification for Low Altitude Digital Aerial Photography (CH/Z 3005-2010);

Internal Specification for Low Altitude Digital Aerial Photogrammetry (CH/Z 3003-2010);

Field Specification for Low Altitude Digital Aerial Photography (CH/Z 3004-20 10) ......

1.2 data source and preprocessing

1.2. 1 data source

In this investigation area, the true color images obtained by aerial photography of unmanned aerial vehicles are selected, and the aerial photography area is 10 square kilometers. The aerial camera adopts Canon EOS 5DMark with focal length of 35mm and phase amplitude of 56 16? 3744, the pixel resolution is 6.4 1um. The ground resolution of the image is 0.2m. ..

1.2.2 remote sensing image preprocessing

The camera used in UAV aerial photography is a non-measuring camera, and it is necessary to correct the image distortion difference when recovering the aerial attitude of the image by aerial triangulation. (Camera distortion correction was completed in the calibration of Siwei Company)

1.3 overall operational flow of aerial survey of unmanned aerial vehicle

1.4 UAV aerial photography

This aerial photography of UAV is divided into two sorties, and the relative flying height is calculated by GPS pilot data. The flying quality and image are good, the image definition is high, the color is uniform, and the saturation is good, which can express the real ground information and meet the mapping requirements of 1:2000.

The heading overlap of photos is 75%, the lateral overlap is generally 35%-45%, and the deflection angle is generally controlled below 12 degrees.

1.5 photo control survey

1.5. 1 Accuracy requirements of image control points

The plane position error from the image control point to the nearest basic control point is not more than 0.2m, and the elevation error is not more than 0.2m.. ..

1.5.2 Layout scheme of image control points

The project layout scheme is determined to be a double model layout, all of which are flat points.

1.5.3 image control point measurement

Before the image control survey, firstly, the known control points collected in the survey area are jointly measured to check the control points; In order to meet the subsequent image control measurement, two control points are encrypted while the known points are jointly measured. The joint measurement adopts GPS static relative positioning method and adopts the form of edge networking. The whole network * * * has 4 known points and 2 new control points. The specific technical parameters during observation are in accordance with the specifications, and the image control points are measured by GPS real-time dynamic positioning (RTK), which meets the requirements.

1.6 aerial triangulation

In this project, Virtuozo workstation is used for aerial 3D encryption. According to the distribution of flight and image, the aerial stereo area is divided into two encryption area networks, and the aerial stereo encryption is carried out by combining automatic and manual methods, that is, the image points are measured by automatic matching method to eliminate gross errors. Manually adjust the connection point to meet the specification requirements. The plane error of the detection point is 0.3m, and the elevation error is 0. 17m. The final encryption result meets the data acquisition requirements of 1:2000.

1.7 data acquisition

After the completion of the third space flight, we found that the model could not be oriented when using the results of the third space flight. There are 29 projects that failed to be approved for the first flight, accounting for 4% of the total. On the second flight, 67 models could not be approved, accounting for 9% of the total number of models. The main reason is that the flight inclination angle and deflection angle caused by the unstable aerial photography attitude of UAV are too large, the route is bent, and the photo scale is inconsistent, all of which lead to poor orientation accuracy of a single model. Considering the accuracy requirements of 1:2000 topographic map, we propose the following solutions: carry out field survey around the out-of-limit point of map orientation, check and analyze the data, and make necessary corrections.

1.8 project accuracy report

According to the accuracy requirements of 1:2000, the accuracy of surveying and mapping products and three topographic maps are counted, among which the maximum error of elevation accuracy is 0.36 m and the minimum error is 0.27 m. From the statistical results, the gross error rate is relatively high, some of them reach 5%, and the average error of plane accuracy is 0.75 m.

2 conclusion

(1) There is uncertainty in the application of UAV aerial photogrammetry technology in topographic map making. For example, the overall encryption accuracy of the local area network is good, but the directional accuracy of a single model is out of line. In the process of drawing, there is a big difference between the drawing orientation point and the three-dimensional model, and there is a big edge-joining error, which can be verified by field measurement.

(2) When aerial photogrammetry is carried out by unmanned aerial vehicle, the test area operation method should be adopted, that is, before determining the layout scheme, a certain area of test area should be selected for the layout scheme test, and the operation scheme should be determined after analyzing the accuracy index.

(3) At present, UAV aerial survey technology is mainly used as a supplement to manned aerial survey technology. For example, many small areas, dangerous places, areas far from the airport or areas where there is no landing space for them are completed by UAVs when manned aircraft are inconvenient or unable to complete.

References:

Fan, Xiong Zhijun, Zhao Yi. Present situation and application of UAV remote sensing [J] Surveying and Mapping Science 2009,34 (5): 214-215;

Cui, Li Jie, Lin Zongjian, Chu Meihua. Research on distortion difference detection of non-metric digital cameras [J] Surveying and Mapping Science 2005,30 (1):105-107;

[3] Lian Zhenhua Analysis of the influence of the tilt angle of aerial photos of unmanned aerial vehicles on the stereo elevation distortion [J] Geospatial information 20 10/0,8 (1): 20-22;

About the author: Xu (1982-), male, Tieling, Liaoning, engineer, mainly engaged in photogrammetry and GIS database construction.

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