A system to maintain a phase difference is disclosed. Two or more aircraft fly in a continuous periodic trajectory. The system maintains a phase difference between the two or more aircraft. Telemetry information for a reference aircraft moving in a first periodic trajectory is received. A phase difference between a primary aircraft and the reference aircraft with respect to the first periodic trajectory is determined. A variance in the phase difference between the primary aircraft and the reference aircraft from the target phase difference is determined. A new trajectory for the primary aircraft that decreases the variance in the phase difference with respect to the new periodic trajectory is determined, and the primary aircraft is maneuvered to follow the new trajectory.

The present invention relates to a fixed wing drone for delivering objects, a takeoff and landing device for a fixed wing drone, a system made up of a drone and a takeoff and landing device, and an approach method for said system. The fixed wing drone comprises wing control surfaces, at least two drive units, at least one tail assembly, at least one structure element which protrudes to the rear and is accessible from the rear, an object holding device, a receiving unit, and a control unit. The takeoff and landing device permits a fixed wing drone to land silently on a vertical structure.

A launch includes a frame including a platform defining a slot designed to slideably receive a rudder of a fixed-wing unmanned aerial vehicle. The launch includes two drive wheels rotatably supported by the frame and defining a space between each other. The space is open to the slot and designed to receive the rudder. The launch includes at least one variable speed drive wheel motor supported by the frame and operatively engaged with the drive wheels.

A base module may be used to receive and house one or more unmanned aerial vehicles (UAVs) via one or more cavities. The base module receives commands from a manager device and identifies a flight plan that allows a UAV to execute the received commands. The base module transfers the flight plan to the UAV and frees the UAV. Once the UAV returns, the base module once again receives it. The base module then receives sensor data from the UAV from one or more sensors onboard the UAV, and optionally receives additional information describing its flight and identifying success or failure of the flight plan. The base module transmits the sensor data and optionally the additional information to a storage medium locally or remotely accessible by the manager device.

Systems and methods for use in the secure recovery of drone delivered packages can include a housing, at least one electromechanically operated door securing access to the housing and a retractable platform that can electromechanically extend from inside the housing to an area outside the housing when the at least one electromechanically operated door is opened. The retractable platform can serve as a landing pad for a delivery drone and/or as a base onto which a package can be received from a delivery drone. The retractable platform can electromechanically move back into the housing and the door can close after receiving the package. Communications components, alarms and cameras can also be associated with the housing to facilitate its operation for package recovery and security. Heating and cooling system components can maintain contents of a package held within the housing at a select temperatures.

A system to maintain a phase difference is disclosed. Two or more aircraft fly in a continuous periodic trajectory. The system maintains a phase difference between the two or more aircraft. Telemetry information for a reference aircraft moving in a first periodic trajectory is received. A phase difference between a primary aircraft and the reference aircraft with respect to the first periodic trajectory is determined. A variance in the phase difference between the primary aircraft and the reference aircraft from the target phase difference is determined. A new trajectory for the primary aircraft that decreases the variance in the phase difference with respect to the new periodic trajectory is determined, and the primary aircraft is maneuvered to follow the new trajectory.

An aircraft launching system and method include a first lifting sub-system including a first tether that removably couples to an aircraft, and a second lifting sub-system including a second tether that couples the first lifting sub-system to the second lifting sub-system.

This disclosure is generally directed to systems and methods for lifting drones to a desired height before launching. In one exemplary embodiment, a drone elevator system includes a looped cable that is engaged to a pair of pulleys. A first pulley of the pair of pulleys is coupled to a lighter-than-air craft and the second pulley is attached to a motor. The lighter-than-air craft moves upwards so as to raise the first pulley skywards and place the looped cable at an angle with respect to the ground. The motor is then operated to rotate the second pulley for moving the looped cable. The cable includes a set of tethers each of which is used to tether a drone. Each tether includes an extension arm that prevents the tethered drone from making contact with the cable when being lifted. Each tethered drone can be launched after being lifted to a desired height.

Embodiments of the present disclosure are directed to systems and methods for autonomously performing and/or facilitating drone diagnostic functions. Prior to a mission of a UAV, an inspection station comprising at least one imaging sensor and at least one directional force sensor may be used to perform a plurality of air worthiness inspections and/or maintenance checks with little to no human intervention. Once the UAV has been determined to be air worthy, it is approved for a subsequent mission.

A base module may be used to receive and house one or more unmanned aerial vehicles (UAVs) via one or more cavities. The base module receives commands from a manager device and identifies a flight plan that allows a UAV to execute the received commands. The base module transfers the flight plan to the UAV and frees the UAV. Once the UAV returns, the base module once again receives it. The base module then receives sensor data from the UAV from one or more sensors onboard the UAV, and optionally receives additional information describing its flight and identifying success or failure of the flight plan. The base module transmits the sensor data and optionally the additional information to a storage medium locally or remotely accessible by the manager device.