Height calculation method based on visual images

Abstract

The invention discloses a height calculation method based on visual images. When an unmanned aerial vehicle carries photoelectric imaging equipment to perform flight missions at different flight heights, the photoelectric imaging equipment is used for performing photographing or video recording by taking a target installed on the ground as a reference object; the obtained images are downloaded toa ground station in real time through image transmission equipment; the pixel size, occupied in a photo, of a target or the time length, occupied in a video, of the target is changed along with the change of the flight height; the larger the flight height is, the smaller the target presented in image information is; the smaller the flight height is, the larger the target presented in the image information is; and the flight height of the unmanned aerial vehicle can be calculated in real time through a formula by identifying a size ratio of the target in the image information. The method has the beneficial effects that the method is simple, data is reliable, and complex operation is not needed; extra equipment weight can be reduced; and the method can be used in cooperation with a barometeror a GPS, so that the errors of height acquisition methods can be balanced, and the flight safety and the data reliability of the unmanned aerial vehicle are improved.

Description

technical field [0001] The invention relates to a height calculation method based on visual images, and belongs to the technical field of obtaining the flight height of unmanned aerial vehicles. Background technique [0002] Unmanned aircraft, referred to as "unmanned aerial vehicle" ("UAV"), is an unmanned aircraft controlled by radio remote control equipment and its own program control device. Compared with manned aircraft, it has the advantages of small size, low cost, convenient use, low requirements for combat environment, and strong battlefield survivability. UAVs are widely used in aerial photogrammetry, border defense monitoring, military reconnaissance and police fire monitoring, power line inspection, urban planning, land survey, mineral development, emergency disaster relief, forest fire prevention, ecological monitoring, flood control and drought relief and other industries and other unmanned Special industries for machine operations. [0003] There are current...

AI Technical Summary

Problems solved by technology

[0003] There are currently two methods widely used to obtain the flight altitude of UAVs: 1. Obtain the atmospheric pressure by measuring the barometer. This method is greatly affected by weather and temperature, and calibration is required when using it; 2. Locate the position of the UAV by GPS Acquisition, this method is affected by weather, environment, satellite distribution, signal propagation, observation and receiving equipment, etc. There are many influencing factors, and the accuracy of GPS positioning altitude is worse than that of longitude and latitude

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