The present disclosure relates to aerial vehicles and particularly to unmanned aerial vehicles (UAVs). More particularly, the present disclosure relates to a system and methods for launching a UAV and for recovering a UAV.
According to the present disclosure, a system for a launching operation of an unmanned aerial vehicle (UAV) and a recovery operation of an unmanned aerial vehicle (UAV) comprises a magazine configured to store a UAV and a robotic assembly configured to interact with the magazine, to connect to the UAV and position the UAV relative to the magazine during the launching operation and the recovery operation. In an illustrative embodiment, the robotic assembly includes a multi-axis robotic arm and a controller in communication with and configured to control the multi-axis robotic arm to position the UAV relative to the magazine during the launching operation and the recovery operation. In another illustrative embodiment, the system comprises a power supply configured to charge a battery onboard the UAV.
In a further illustrative embodiment, the system comprises a plurality of UAVs and a method of launching a UAV and a method of recovering a UAV.
Additional features of the present disclosure will become apparent to those skilled in the art upon consideration of the following detailed description of illustrative embodiments exemplifying the best mode of carrying out the disclosure as presently perceived.
The detailed description particularly refers to the accompany figures in which:
The present disclosure relates to a system 10 for a launching operation of an unmanned aerial vehicle (UAV) 12 and a recovery operation of a UAV 12. The UAVs 12 may be launched and recovered from a variety of stationary and mobile launch and recovery platforms such as, for example, vehicle 14 configured as a high-mobility multipurpose wheeled vehicle (HMMWV). However, it is within the scope of the present disclosure to utilize other platforms including, for example, trucks, tracked vehicles, boats, unmanned ground vehicles, stationary platforms such as, for example, buildings, ship docks, radio towers, oil tanks, pipe lines and perimeter fences, or other such platforms suitable for launching and recovering UAVs 12.
System 10 includes a base 16 configured to be mounted on vehicle 14 and a robotic assembly 17 located adjacent to base 16. Robotic assembly 17 includes a multi-axis robotic arm 18 and a controller 20 configured to communicate with the multi-axis robotic arm 18 for selective operation of multi-axis robotic arm 18, as suggested by the different positions and movements of multi-axis robotic arm in
Multi-axis robotic arm 18 is configured to be manipulated in six (6) degrees of freedom or motion directions. Such motion directions include linear directions X, Y, and Z and rotary directions roll, pitch and yaw, as shown by the directional icons and arrows in
Controller 20 includes a computer 34 and servos 36. Controller 20 is configured to move and position multi-axis robotic arm 18 to extract UAV 12 from or return UAV 12 to magazine 22, as suggested in
Horizontal carriage 28 includes a rod-receiving sleeve 50 configured to receive extension rod 26 therein and upper and lower connectors 52, 54 coupled to rails 24 and 25, respectively. Horizontal carriage 28 is arranged to provide horizontal movement of multi-axis robotic arm 18 relative to magazine 22 along rails 24 and 25.
Multi-axis wrist 30 includes a pitch connector 56, a roll-axis servo 58, and gripper 59 configured as latch collet 60. Pitch connector 56 is coupled to an upper portion of extension rod 26 for pivotable movement thereto and provides means for adjusting a pitch attitude of multi-axis wrist 30 during launching and recovery operations. Pitch motions of multi-axis wrist 30 are driven by pitch servo 31 (see
UAV 12 is configurable and adaptable for use with the structure disclosed in U.S. Patent Application Publication No. 2006/0011777, the disclosure of which is hereby incorporated by reference herein. In an illustrative embodiment, UAV 12 includes a capture device, configured, for example, as a ball stud 62 and a light-emitting diode (LED) 64, as shown in
During launching and recovery operations, for example, from mobile platforms such as vehicle 14, the direction of airflow over UAV 12 is determined, at least in part, by the ground speed of vehicle 14 and local atmospheric wind conditions. This airflow is defined herein as the relative wind 77, as suggested in
Ground vehicle 14 may, for example, be traveling in a convoy of similar vehicles at, for example, 30 to 60 miles per hour. Air passing over the top and sides of vehicle 14 may create a turbulent airflow around vehicle 14 in the direction of travel of vehicle 14. As vehicle 14 passes other vehicles or buildings the direction of the local side winds may change abruptly thereby affecting the relative wind 77. An advantageous feature, for example, of the current disclosure is that a UAV may be positioned to perform a launching operation directly into the relative wind 77 under most circumstances.
In a UAV 12 launch sequence, multi-axis robotic arm 18 extracts one of the UAVs 12 from magazine 22 in a direction 72 as shown in
In a UAV 12 recovery sequence, controller 20 is configured to move and position multi-axis robotic arm 18 to capture UAV 12 in flight, as suggested in
As UAV 12 approaches system 10 in a direction 78, as suggested in
In an illustrative embodiment, UAV 12 uses a miniature laser radar (LADAR) or acoustic rangefinder in conjunction with a standard Electro-Optical/Infra-Red (EO/IR) video camera (not shown) or a low-light EO video camera (not shown) to assist in the launching and recovery operations. The LADAR or acoustic rangefinder is bore-sighted to the EO camera to provide an accurate range and closing velocity of UAV 12 to latch collet 60 via computer 34. A camera image is used to track light emitting diode (LED) 64 below ball stud 62 and guide UAV 12 into recovery window 48.
In another illustrative embodiment, a plurality of spaced apart LEDs (not shown) are provided on multi-axis robotic arm 18 to help determine closing range and velocity.
High-speed bi-directional communications 35 between UAV 12 and controller 20, via computer 34, coordinate launching and recovery operations. Absolute orientation vectors, global positioning system (GPS) coordinates, velocity vectors, acceleration vectors of vehicle 14 and UAV 12 and other data are communicated between computer 34 and UAV 12 to calculate a rough terminal flight path for UAV 12 to place ball stud 62 within recovery window 48 of system 10 as ball stud 62 passes into and through recovery window 48.
As the relative distance between vehicle 14 and UAV 12 decreases, for example, to about 20 feet, a more exact positioning system takes control of the recovery operation. A timed acoustic or similar signal emitted by computer 34 is received by UAV 12 and is used to determine a relative separation distance of UAV 12 and system 10. Since UAV 12 has inertia from rotor system 66, UAV 12 is unable to maneuver as quickly as multi-axis robotic arm 18 can move latch collet 60. Thus, a delta coordinate, that is, the difference between the two positions and speeds, is calculated by computer 34 to move multi-axis robotic arm 18 rapidly to position gripper 59, including latch collet 60, in a direction 80 directly in front of a flight path of UAV 12, including the capture device configured as ball stud 62, as suggested in
Since steering UAV 12 in flight requires constantly changing an absolute angular orientation of a fuselage 68 of UAV 12, ball stud 62 may approach latch collet 60 at any angle. As UAV 12 approaches latch collet 60, the angular orientation of UAV 12 and vehicle 14 are compared and roll-axis servo 58 and pitch axis servo 36 cooperate to coaxially align latch collet 60 with ball stud 62, as shown best in
Magazine 22 includes a housing 38 having an upper surface 40, storage tubes 42, and a cover 44. Magazine 22 is arranged to transport and store UAVs 12 before launching and after recovery operations as shown, for example, in
In an illustrative embodiment, housing 38 is formed to include eight storage tubes 42. It is within the scope of this disclosure, however, to include more than eight or less than eight storage tubes 42 therein. Upper surface 40 is formed to include apertures 70 opening into storage tubes 42, as shown in
Cover 44 is pivotably coupled to magazine 22 and is actuated by computer 34 to move between a closed position, shown in
In another illustrative embodiment, as shown in
A 3-dimensional recovery box 47 is defined by travel limits of the X, Y and Z axes of system 10A as shown by the XYZ triad 49 in
In some operational situations it is desirable to repeatedly launch and recover a plurality of UAVs 12 within a short period of time. One such situation occurs in “swarming” operations, wherein a plurality of UAVs 12 are deployed simultaneously and operated in a coordinated fashion to accomplish a common objective or perform complementary functions. Examples of swarming include deploying a line of UAVs 12 spaced apart by several miles to act, for example, as radio communications relays or employing a plurality of UAVs 12 equipped with video cameras. This may be done to visually monitor a crowd of militant demonstrators from several aerial vantage points simultaneously or for coordinating the flight patterns of multiple UAVs 12 over a defined area in search and rescue operations.
In situations requiring fast charging of the batteries on board electric-powered UAVs 12, such as in swarming operations where many UAVs 12 must remain in the air continuously, provisions may be made for a high-power electric generator, shown, for example, as generator 88. Generator size may be an important factor for best operation of the charging system needed for UAVs 12, according to the present disclosure. For example, a UAV 12 may have a 12 volt 10 amp-hour flight battery on board that may need to be charged in 15 minutes. This would require about 40 amps of electrical current. Charging ten (10) UAVs 12 simultaneously would require about 400 amps of electrical current at 12 volts or about 4800 Watts of power. This would require a generator 88, for example, having about 6.5 mechanical horsepower. Charging the 64 UAVs 12 in MBU 86, for instance, would take more than 45 mechanical horse power from an electric generator. Thus, an auxiliary gasoline-powered electric generator 88 may be provided to recharge batteries on board the UAVs 12, as suggested in
A duty cycle of one or more of the UAVs 12, according to the present disclosure, is defined as a ratio of total time in flight of a UAV 12 divided by the sum of the total time in flight of the UAV plus the total time to recharge the onboard battery of the UAV 12 by, for example, power supply 88. A system duty cycle, for example, for systems 10, 10A and their respectively UAVs 12, depends in large part on the size of electric generator 88. For example, if an electric-powered UAV 12 includes a total flight time of 60 minutes and 15 minutes is required to recharge its on board battery, a maximum duty cycle of that UAV 12 is 60 minutes divided by (60+15) minutes or 60/75, which equals 0.8 or an 80% duty cycle. To support swarming operations with a UAV duty cycle of about 80%, it may be desirable to provide an auxiliary generator 88 or similar power supply sized to charge all UAVs 12 in the systems 10, 10A simultaneously.
While UAVs 12 shown in the figures are configured to be co-axial rotary-wing UAVs, it is within the scope of the present disclosure to configure the UAVs 12 with fixed wings, fins or any other manner of aerodynamic actuator or propulsion device compatible with the systems 10, 10A disclosed herein.
The systems 10, 1 OA disclosed herein include a number of advantageous features. For example, one advantageous feature is the ability to launch and recover UAVs 12 automatically under computer control without human intervention. This feature can increase safety in military applications since soldiers may remain inside buildings and vehicles where they will not be exposed to enemy weapons fire while UAVs 12 are being launched and recovered automatically. Systems 10, 10A may also be operated from a moving vehicle. This may increase safety for vehicles and crewmembers in military applications since moving vehicles pose a more difficult target for enemy fire than do stationary vehicles.
Another advantageous feature is the reduction in costs because no human operator is required to launch and recover the UAVs 12. For applications such as long-term surveillance and monitoring of perimeter fences, oil pipe lines, ship ports, highway congestion, etc., systems 10, 10A may be located remotely from a central data processing area and may operate remotely and automatically without attention from human operators, thereby saving the cost of the human operator that would otherwise be required.
Yet another advantageous feature is the ability of systems 10, 10A to deploy a large number of UAVs 12 in a short time period and to automatically recover, charge and redeploy those UAVs 12 for extended, multi-UAV operations. This may be a particular advantage in “swarming” operations conducted over extended time frames.
Another advantageous feature is that the launching and recovery of the UAVs 12 occurs at a distance from a moving platform, such as vehicle 14, thereby placing the UAVs 12 outside the turbulent boundary layer or wake of moving vehicle 14. This creates more favorable flying conditions for UAV 12 and increases the chance of success in launching and recovery operations. During recovery operations, recovery window 48 and recovery box 47 create large target areas for UAV 12 in which to place ball stud 62, thereby increasing the chances for successful recovery of UAV 12.
Magazine 22 is shown as having storage tubes 42 which are stationary with respect to magazine 22 and a UAV 12 is shown being extracted and inserted by the robotic assembly 17 from/to a stationary storage tube 42. It is within the scope of the present disclosure that one or more storage tubes 42 may be movable or magazine 22 may be movable to facilitate extraction and insertion of a UAV 12, as opposed to the UAV 12 being manipulated by multi-axis robotic arm 18 to be extracted from or inserted into the magazine 22 or storage tube 42. In an embodiment according to the present disclosure, storage tube 42 may be configured to partially open for insertion of UAV 12 and to close around UAV 12 to induce folding of rotor blades or fins of rotor system 66 on UAV 12 (not shown).
It is within the scope of the present disclosure that, regarding the launching and recovering operations of a UAV 12 described herein, the UAV 12 being recovered by systems 10, 10A need not be the same UAV 12 that was launched by that very system 10, 10A. A UAV 12 launched by some other system from some other location may be captured, stored, charged and launched by systems 10, 10A. This would be advantageous, for instance, in convoy operations where a convoy of moving vehicles equipped with systems 10, 10A, in accordance with the present disclosure, supports a swarm of UAVs 12 in a combat air patrol (CAP) above of a convoy at all times. UAVs 12 may be repeatedly launched from one system 10, 10A, provide air cover for the convoy and be recovered and charged by another system 10, 10A.
This application claims priority under 35 U.S.C. § 119(e) to U.S. Provisional Application Ser. No. 60/917,264, filed Saturday, May 10, 2007, which is expressly incorporated by reference herein.
Number | Date | Country | |
---|---|---|---|
60917264 | May 2007 | US |