In the all the spheres, unmanned aerial vehicles (drones) have become much more accessible over the past years and have received a lot of scientific interest. There is a great number of scientific publications and it is necessary to organize them and give a general description for each area, that was highlighted in progress of analysis. This paper considers several scientific studies, which were divided in five groups by research direction. Each direction has its own aim and is intended to solve certain problems. The current paper highlights several studies as examples for each group. Each group is briefly characterized and examples of the studies reviewed. The following groups should be highlighted: Innovations in the area of use; Navigation of drones; Engineering of drones; Legislative aspects; and Safety. Innovations in the area of use is the largest direction by the number of studies, as the scope of drones is very wide and increasing every year. Drones can be used to monitor, deliver, scan and analyze. Legislative research helps create and regulate UAV laws. The purpose of navigation research is to improve the air traffic of drones, the formation of flight and the management of drones during this flight. Studies in this category are aimed at collision avoidance, forming a coalition of drones in free flight, creating "road maps" and algorithms. Technical studies are related to changes in design and software for several types of drones and individual models. Studies about Safety are common in all previous areas. Safety is an essential group for the use, improvement and development of drones. The huge demand for drones causes the raise in the scientific interest to them and constantly grows new research examples in a wide variety of fields. Analyzing existing research gives the reader a better understanding of usage of drones and current scientific frontier. It helps to understand where more research needs to be done, what are the most relevant industries for drones in the modern world.

drones, unmanned aerial vehicle,area of use, drones safety, research analysis

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