A device, method and system for determining the flying height of an unmanned aerial vehicle

Abstract

The invention relates to a device, method and system for determining the flight height of an unmanned aerial vehicle. Described determination device comprises that the camera of the bottom of unmanned aerial vehicle is carried on the three-axis self-stabilizing cloud platform; Carrier phase differential satellite positioning system, graphic processing computer and power supply system are all arranged on the top of unmanned aerial vehicle; Graphical processing computer and carrier wave respectively The phase difference satellite positioning system, power supply system and camera are connected; the attitude reference system is set at the bottom of the three-axis self-stabilizing head, and the attitude reference system is connected with the graphics processing computer; the graphics processing computer is used to collect The relative height of the UAV from the canopy of crops on the surface of the farmland is determined by the position information and the attitude information collected by the attitude reference system and the ground orthophoto image obtained by the camera, and the flight height of the UAV is determined according to the relative height. The invention realizes the accuracy of determining the flying height and the stability of data.

Description

technical field [0001] The invention relates to the field of unmanned aerial vehicles, in particular to a device, method and system for determining the flying height of an unmanned aerial vehicle. Background technique [0002] When using drones to obtain information on agricultural and forestry crops, because the optical imaging mission equipment has requirements for focal length and focus, the drone needs to maintain a relatively stable distance from the photographed crops as much as possible when flying. If a relatively high degree of stability cannot be maintained, "out-of-focus" will often occur, resulting in blurred images and lack of learned information. When working in plain areas, especially when working in standard farmland after leveling, the drone can fly at a fixed altitude and keep this altitude. However, in terraced fields or hilly areas, drones need to perform ground imitation flight based on terrain data or other airborne equipment. At present, the accuracy...

AI Technical Summary

Problems solved by technology

At present, the accuracy of commonly used geographic information data is about 1 meter, and what is expressed is not the height of the crop canopy. Commonly used airborne equipment such as laser range finders and ultrasonic range finders are calculated by taking the average of several points. Relative height, there are many problems here, due to the interference of canopy density, soil moisture content, air humidity, solar radiation, etc., it is not very stable to monitor the relative height of the drone and the crop canopy

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