Due to payload constraints, the drone serves a single customer at a time returning back to the dispatching point (DP) after each delivery to load a new parcel for the next customer. In these mixed-areas, called EM-grids, the distances are measured with two different metrics, and the shortest path between two destinations concatenates the Euclidean and Manhattan metrics. In this paper, we present a drone-based delivery system that assumes to deal with two different mixed-areas, i.e., rural and urban. Thus, the battery of the base station can be safely recharged. This charging period is shorter than the mission cycle of the drone, wherein one mission cycle is planned every six hours to collect the data of the sensor nodes distributed in the farm field. The solar panels are sufficient for fully charging the battery of the base station with the required charging voltage (i.e., 24 V) and current (1.667 A) in less than 4.8 h. The battery supplies the ZVS oscillator circuit and the FSC with DC power during the drone's landing. The solar panels are used to charge the base station battery through the DC-DC converter and charger controller. Otherwise, the FSR sensor turns off the charging circuit to keep the ZVS oscillator circuit and the FSC in the off state during a drone mission in the farm field and to save the energy of the base station's battery. When the drone lands on the station, the FSR sensor senses the weight of the drone and turns on the charging circuit. to face the sun (iv) A rechargeable 24 V/7 Ah battery (v) An LM2596 DC-DC converter (vi) A battery charger controller, and (vii) A force-sensitive resistor (FSR) to switch the drone charging on and off.The base station consists of: (i) A 50 cm × 50 cm FSC WPT pad for landing and takeoff (ii) An FSC WPT coil with a 1 A/12-30 V DC input ZVS oscillator circuit (iii) Two 2 × 30 W 60 W/36 V solar panels positioned on the left and right sides of the station frame with an inclination of 30 The height of the station is 2.7 m from the ground. Its interchangeable micro-tethers and smart adaptive winch control laws, allow the operator to reconfigure the station and use the best tether weight/power range for each drone.The base station of the drone. Ready for integrationĮngineered to meet the most demanding missions with its rugged weather-resistant design, and compact modular metallic structure, the Safe-T 2 offers mounting plates and optional software development kit (SDK) for seamless integration into vehicles and fixed structures whilst also being agile enough for a single operator to deploy. Like its predecessor, the Safe-T 2 integrates Elistair’s live flight management system with T-monitor mobile app offering optimal flight control for safer operations. ![]() A patented Brake system also allows the user to adapt the maximal tether length, depending on the safety zone needed around the aircraft, for instance in urban or crowded environments. The secure Dual-Comms option (Fiber optic and BPL), offers a redundant tethered data link, or the possibility to select which technology is best suited for the aircraft and/or payload. The Safe-T 2 has been built on the success of the flagship Safe-T product line which has been deployed in over 60 countries by governmental organizations, industrial groups, and security forces. A patented Dynamic Voltage Optimization (DVO).Elistair's Safe-T 2 advanced and powerful tethering system was designed for use with commercially available drones. The Safe-T 2 provides users with unmatched power efficiency and enables safe and persistent flight time for UAVs.
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