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Öğe Improvement of Ultrasonic Sensor-Based Obstacle Avoidance System in Drones(Selçuk Üniversitesi, 2023 Haziran) Kazan, Fatih Alpaslan; Solak, HaydarAlthough drone users have received the necessary training, the reflexes of making decisions against a sudden natural event such as wind and avoiding a nearby obstacle may not be sufficient. Therefore, whether drones fly autonomously or under user control, they must sense and act accordingly for an uninterrupted mission. In this study, a drone design and application for obstacle detection and obstacle avoidance were carried out. In the designed drone, Pixhawk was used as the flight control board, ultrasonic sensors were used to detect obstacles, and Arduino Uno was used as a microcontroller to obtain avoidance commands. The sensors used in obstacle detection and their performance are the most decisive factors in achieving the targeted goal. Because obstacle detection sensors are affected by electrical noises, the success of detecting obstacles decreases. For this reason, first of all, the integration of these sensors into the system was investigated and the drone was developed accordingly. Then, an algorithm was developed using a software filtering method both to minimize communication instabilities and to increase the clarity of detection. Finally, the ability to evade obstacles both while the drone is suspended in the air and while it is in motion has been investigated. In the experiments carried out, it was found that the drone was able to successfully avoid obstacles up to a flight speed of 3.94 m/s.Öğe Microcontroller Based Simulation of the Very High Frequency Omnidirectional Radio Range (VOR) System in Aircraft(Selçuk Üniversitesi Sivil Havacılık Yüksekokulu, 2020) Kazan, Fatih AlpaslanAs it is known, different navigation systems, such as Non-Directional Beacon (NDB), Automatic Direction Finder (ADF), Very High-Frequency Omnidirectional Radio Range (VOR), Instrument Landing System (ILS) and Distance Measurement Equipment (DME), are used for the aircraft to take off, travel and land safely. This study aims to motivate students, who educate in aviation electricity and electronics departments of aviation schools established to meet the needs of the aviation industry, to learning the microcontroller course better. To achieve this aim, the VOR receiver, which shows the aircraft's radial according to the VOR station from which receives its signal, has been simulated. Since the microcontroller to be used in simulation and the compiler to be used in programming the microcontroller may vary, only flow diagrams and basic calculations are given. In the simulations, it was seen that the phase difference between the reference and variable signals sent by the VOR station were correctly detected, and thus the aircraft could accurately determine the radial relative to the VOR station.
