Device and method for determining exposure moment of aerial survey camera in unmanned aerial vehicle

Abstract

The invention relates to the field of the aerial photogrammetry of the unmanned aerial vehicle and in particular relates to a device for determining the exposure moment of an aerial survey camera in the unmanned aerial vehicle. The device comprises an unmanned aerial vehicle flight control system, the aerial survey camera and a GNSS (Global Navigation Satellite System), which are connected sequentially, wherein the unmanned aerial vehicle flight control system generates a first exposure signal according to the preset exposure control information, the aerial survey camera is used for exposing according to the first exposure signal and generating a synchronizing signal simultaneously, and the GNSS system is used for determining the accurate exposure moment of the aerial survey camera according to the synchronizing signal. The invention also relates to a method for accurately determining the exposure moment of the aerial survey camera in the unmanned aerial vehicle. According to the device and the method, the technical problem that the exposure moment of the industrial digital camera is accurately determined is solved, and the accuracy of resolving the elements of exterior orientation of the aerially surveyed photo through post interpolation of data of the GNSS is greatly improved.

Description

technical field [0001] The invention relates to the field of unmanned aerial photogrammetry, in particular to a device and method for measuring the exposure time of an aerial survey camera in an unmanned aerial vehicle. Background technique [0002] In the prior art, the precise time information of the exposure time of the digital camera in the UAV aerial photogrammetry work is not recorded or the time of the exposure pulse signal sent by the UAV flight control system is used as the camera exposure time, and the camera exposure delay is not considered. Therefore, it cannot accurately reflect the camera exposure moment. Without accurate time information, it is impossible to effectively match and correlate with precise coordinate information, which makes aerial photogrammetry require a large number of ground image control points for precision support. For example, the frequency of GPS (Global Positioning System, Global Positioning System) is generally It is about 4HZ, and dro...

AI Technical Summary

Problems solved by technology

Patent No. CN201310012924.9 discloses a real-time acquisition and recording method of the exposure signal of a small aerial survey camera for unmanned aerial vehicles. The camera exposure signal is obtained from the front curtain of the camera shutter, and the time information of this signal is recorded by the GPS device as the camera exposure time, but in this method, the camera exposure signal is drawn from the fr

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