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Abstract Introduction

This project analyzes ways unmanned aerial vehicles (UAVs) can be tethered prolonging flight duration and securing data transmission. The current drone tether market tailors to UAVs that can carry large loads, facing less stringent criteria regarding tether weight, a fundamental constraint when developing UAV tethered systems. Majority of tether systems have the same general components including a ground station used to step up the transmission voltage (Step-up), a tether to deliver the power/transmit data, and a module on-board to convert the voltage (Buck) matching to the UAV’s specification.  This paper investigates the impact of weight from various methodologies for power transmission such as multiphase AC, single-phase high frequency or high voltage DC transmissions for UAV tethering applications. Additionally, the paper investigated the feasibility and experimental capability of a tether system developed for a small UAV with the ability to detach itself from the tether when signaled. This is a feature new to the drone tether market, and the development of such a system can provide various benefits for security and mobile mapping system applications. The research concluded that high voltage DC minimized the component weight constraint for a drone tethered system. The DJI Mavic Pro was the selected small UAV, due to its popularity and size. The selected drone was tested to determine the payload capacity and power consumption. The power consumption was determined from a bench test and was verified by comparing the data to the internal DJI log files. The results of the initial testing lead to the procurement of the required hardware configuration to enable the appropriate transmission, minimizing both tether size and component weights. Testing verified successful power transmission and drone flight in the lab using a 25’ wire. The detachable tether application testing was inconclusive as power from the battery did not take over tether power when tether power was removed. In conclusion, testing results suggest that tethering a micro-UAV is a feasible, untapped potential in the ever-growing UAV industry.  

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