System and method for the retrieval of a smaller unmanned aerial vehicle by a larger unmanned aerial vehicle

Abstract

A system and method are provided for using a first aircraft to retrieve a second aircraft. The first aircraft is typically larger than the second aircraft. A minimum airspeed of the first aircraft is typically greater than a maximum airspeed of the second aircraft. The first aircraft flies in a substantially circular pattern and extends a tow line, such that the tow line forms a substantially helical shape behind and below the first aircraft. Due to the helical shape, there is at least one point along the extended tow line at which the speed of the tow line is substantially equal to the speed of the second aircraft. The second aircraft can readily latch onto the tow line at that point, thereby minimizing potential damage otherwise caused by differential airspeeds.

Description

BACKGROUND OF THE INVENTION[0001]This application is a divisional of U.S. patent application Ser. No. 12 / 407,231, filed March 19, 2009 the contents of which are incorporated herein by reference.FIELD OF THE INVENTION[0002]The invention relates to aircraft recovery systems. More particularly, this invention relates to a system and method for recovery of a smaller unmanned aerial vehicle (micro aerial vehicle (MAV)) by a larger unmanned aerial vehicle.BACKGROUND ART[0003]Unmanned aerial vehicle (UAV) technology has proven to be an essential surveillance tool. UAV technology is so pervasive, that unmanned aircraft are not uncommon on the daily television news. Though larger UAVs are typically shown, the variety of vehicles in the field is actually much larger. In general terms, though, the types of aircraft can be divided into two different groups. In the first group are the long range, high altitude, and relatively high speed UAVs, with optical sensor and / or synthetic aperture radar (...

AI Technical Summary

Benefits of technology

[0013]It is therefore a general object of the invention to provide a system and method for safely capturing MAVs that will obviate or minimize problems of the type previously described.

Problems solved by technology

Unfortunately, no satisfactory method truly exists for recovery of MAVs by a UAV at the present time.

This is generally not the case, however, as larger UAV's suitable to the task can fly only as slow as 70-260 knots, while small MAVs have a top speed of only about 30 knots.

This disparity in speed means that the capture problem is significant.

This task is further complicated by the presence of wind which can result in vertical oscillation of the payload.

It should be noted that while all of the above prior art examples appear to be, at the least, interesting uses of long-line placements of objects, none of the prior art recognizes, teaches, suggests, or comprehends that extending a long line from an aircraft can be used for anything more than placement and / or retrieval of objects on or near stationary locations.

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