Geodetski list, Vol. 70 (93) No. 2, 2016.
Review article
Analysis of the Gimbal Impact on the Determination of Camera External Orientation Elements on the UAV
Mateo Gašparović
orcid.org/0000-0003-2345-7882
; Faculty of Geodesy, University of Zagreb, Zagreb, Croatia
Dubravko Gajski
orcid.org/0000-0002-0237-647X
; Faculty of Geodesy, University of Zagreb, Zagreb, Croatia
Abstract
In this paper are presented and interpreted the results of the analysis of the gimbal impact to the determination of the external orientation elements on the UAV. Gimbal presented in this paper is a 3-axis gimbal based on brushless motors. The paper describes and explains the concept of the camera stabilizer on UAVs. For the purposes of this paper, the gimbal is improved by using the second inertial measurement unit (IMU). Two tests using one and two inertial measurement units were conducted on the stabilizer. Testing has determined multiple increase of precision of external orientation parameters of images obtained by improving the gimbal. Given that the testing is carried out in real dynamic environment, it was observed from statistical parameters more uniform dispersion with 5 times lower minimum and maximum values of the deviations on the improved stabilizer. This ultimately confirms greater reliability of external orientation parameters. The standard deviation of angular external orientation elements improved by the gimbal is 0.14° for φ or 0.10° for ω, which is in relation to the basic gimbal increase of about 5 times.
Keywords
UAV; IMU; gimbal; external orientation parameters; photogrammetry
Hrčak ID:
164573
URI
Publication date:
30.6.2016.
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