Abstract
In this paper, results from the analysis of the gimbal impact on the determination of the camera exterior orientation parameters of an Unmanned Aerial Vehicle (UAV) are presented and interpreted. Additionally, a new approach and methodology for testing the influence of gimbals on the exterior orientation parameters of UAV acquired images is presented. The main motive of this study is to examine the possibility of obtaining better geometry and favorable spatial bundles of rays of images in UAV photogrammetric surveying. The subject is a 3-axis brushless gimbal based on a controller board (Storm32). Only two gimbal axes are taken into consideration: roll and pitch axes. Testing was done in a flight simulation, and in indoor and outdoor flight mode, to analyze the Inertial Measurement Unit (IMU) and photogrammetric data. Within these tests the change of the exterior orientation parameters without the use of a gimbal is determined, as well as the potential accuracy of the stabilization with the use of a gimbal. The results show that using a gimbal has huge potential. Significantly, smaller discrepancies between data are noticed when a gimbal is used in flight simulation mode, even four times smaller than in other test modes. In this test the potential accuracy of a low budget gimbal for application in real conditions is determined.
Highlights
Unmanned Aerial Vehicle (UAV) photogrammetry has been advancing at a fast pace in recent years
The results of the tests taken in order to analyze the impact of the gimbal on the stability of were not taken exterior into consideration because the exterior orientation data of those images would corrupt orientation, and its ability to achieve a better geometry of bundles of rays in UAV
The results of the tests taken in order to analyze the impact of the gimbal on the stability of exterior orientation, and its ability to achieve a better geometry of bundles of rays in UAV
Summary
Unmanned Aerial Vehicle (UAV) photogrammetry has been advancing at a fast pace in recent years. This is primarily the result of the development of Micro Electro Mechanical Systems and Nano. Apart from smoothing angular movements and dampening vibrations, a gimbal maintains a camera in a predefined position. This is mostly the position in which the camera’s axis is horizontal or vertical, but all other positions according to the gimbal’s technical capabilities are possible. This very fact has encouraged interested into the research of gimbal capabilities in maintaining angular parameters of exterior orientation. The main interest is focused on the current capabilities of low budget gimbals, and both potential and possible technological applications, in geodesy, and in other professions, can be foreseen [3,7,8,9]
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