Determining of correlation relationship between angular elements of external orientation

Abstract

The current state of development of science and technology definitely influenced the introduction of UAVs in various areas of economic development and military affairs. And this trend, since it brought positive results, will continue to grow. Therefore, the study of UAV capabilities, both design and operational, is a necessary component. The authors proposed a new algorithm for processing the results of digital shooting and determining the dependencies of the influence of the angular elements of the external orientation (EEO) of the images, which will make it possible to significantly improve the accuracy of the searched terrain coordinates. One of the main requirements for aircraft-type UAVs used in aerial surveying is absolutely horizontal flight. That is, maintaining the minimum angles of inclination of the external orientation of the images. And so, the idea arose to find the correlation coefficients between them when modeling the angles of inclination α and ω relative to the fixed angle ϰ (since this angle is actually compensated with the help of an aero device). So, if there is such a dependence, then based on the values of these values, it is possible to introduce a correction in the design of a micro-UAV and thereby increase stability during horizontal flight. Everything will depend on the value of the correlation coefficient: the larger it is, the more significant the possibility of improvement in the design of the UAV. Such modifications can be the displacement of the center of gravity of the structure, the profile and quantitative parameters of the plane, the shape of the fuselage, etc. The application of this direction will lead to the determination of the exact parameters of the EEO, since the installation of an accurate stabilization system and the determination of the angular EEO images (INS) on these devices is not possible, since there are often restrictions on the loading of UAVs. Regarding the determination of linear EEO, the issue can be solved by installing a dual-frequency GPS receiver on the UAV, which will allow obtaining the coordinates of the projection centers with an accuracy of 1–2 cm. The refinement of the EEO of digital images leads to an increase in the accuracy of the spatial coordinates of object points.