Rapid measurement method of UAV super-wide river surface flow field
A measurement method and unmanned aerial vehicle technology, applied in the direction of fluid velocity measurement, velocity/acceleration/impact measurement, measuring devices, etc., can solve the problem that the coordinates of the flow field in the measurement area cannot be converted, and the problem of mapping between the river coordinate system and the image coordinate system is not solved , flow field measurement value discount, etc.
Active Publication Date: 2022-04-12
CHONGQING JIAOTONG UNIVERSITY
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The two patents CN201710213293.5 and CN201710692301.9 did not solve the problem of mapping between the river coordinate system and the image coordinate system, that is, using the methods of these two patents, the surface flow field under the image coordinate system of a certain survey area in the river can be obtained , but the flow field coordinates in the survey area cannot be transformed into the river coordinate system, and the surface flow fields between multiple survey areas cannot be spliced, and the value of flow field measurement is greatly reduced
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[0068] The present invention will be further described in detail below in combination with specific embodiments.
[0069] For specific implementation: see Figure 1-5 , a method for quickly measuring the surface flow field of an ultra-wide river with a UAV. In this method, the UAV is equipped with a camera to take aerial photos of the river and calculate the surface flow field of the river according to the shooting content. The method includes the following steps: a. The camera carried by the man-machine is calibrated to establish the corresponding proportional relationship between a single pixel and the actual length at different flight heights; c. According to the images taken at each shooting point, the image analysis is carried out to obtain the surface flow field in the image coordinate system; d. According to the mapping relationship between the image coordinate system and the river coordinate system as the prototype, the coordinate system conversion is carried out to ob...
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The invention discloses a method for quickly measuring the surface flow field of an ultra-wide river with an unmanned aerial vehicle. In this method, the camera carried by the unmanned aerial vehicle is used to take aerial photos of the river and calculate the surface flow field of the river according to the shooting content. It is characterized in that it includes the following Steps: a. Calibrate the camera carried by the UAV, and establish the corresponding proportional relationship between a single pixel and the actual length at different flight heights; b. Set the UAV cruise shooting path and calculate the shooting point, and set the shooting process parameters , and then shoot according to the set situation; c, according to the images taken at each shooting point, perform image analysis to obtain the flow field in the image coordinate system; d, according to the mapping relationship between the image coordinate system and the river coordinate system as the prototype, perform system transformation, the surface flow field in the river coordinate system is obtained. The invention solves the problem of mapping the super-wide river surface flow field coordinate system, and can realize the surface flow field measurement under the super-wide river prototype coordinate system without arranging control points.
Description
technical field [0001] The invention relates to the technical field of river flow velocity measurement, in particular to a rapid measurement method for an ultra-wide river surface flow field by an unmanned aerial vehicle. Background technique [0002] River flow velocity is an important parameter of hydrological observation, which can provide important support for flood control safety, water resource evaluation, and hydraulic engineering design. At present, the flow velocity of rivers is generally measured by a propeller flow meter. This method is a single-point measurement, and it is quite difficult to install in the field. Doppler Profile Velocimeter (ADCP) is also used to measure the flow velocity. This method can measure the flow velocity of a certain section of the river, but the measurement of the flow field in the whole river section is time-consuming and labor-intensive. In particular, during the flood period, the flow velocity measurement equipment installed in the...
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IPC IPC(8): G01P5/00
CPCG01P5/00
Inventor 吴俊舒岳阶张绪进周世良周远航马御风
Owner CHONGQING JIAOTONG UNIVERSITY