MALLS - Mobile Automatic Launch and Landing Station for VTOL UAVs
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
The market for vertical takeoff and landing unmanned aerial vehicles, VTOL UAVs, is growing rapidly. To reciprocate the demand of VTOL UAVs in offshore applications, CybAero has developed a novel concept for landing on moving objects called MALLS, Mobile Automatic Launch and Landing Station. MALLS can tilt its helipad and is supposed to align to either the horizontal plane with an operator adjusted offset or to the helicopter skids. Doing so, eliminates the gyroscopic forces otherwise induced in the rotordisc as the helicopter is forced to change attitude when the skids align to the ground during landing or when standing on a jolting boat with the rotor spun up. This master’s thesis project is an attempt to get the concept of MALLS closer to a quarter scale implementation. The main focus lies on the development of the measurement methods for achieving the references needed by MALLS, the hori- zontal plane and the plane of the helicopter skids. The control of MALLS is also discussed. The measurement methods developed have been proved by tested implementations or simulations. The theories behind them contain among other things signal ﬁltering, Kalman ﬁltering, sensor fusion and search algorithms. The project have led to that the MALLS prototype can align its helipad to the horizontal plane and that a method for measuring the relative attitude between the helipad and the helicopter skids have been developed. Also suggestions for future improvements are presented.
Place, publisher, year, edition, pages
2008. , 54 p.
MALLS, VTOL UAV, helicopter, helipad, sensor fusion, TDOA, Kalman ﬁlter, positioning.
Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:liu:diva-15980ISRN: LITH-ISY-EX--08/4190--SEOAI: oai:DiVA.org:liu-15980DiVA: diva2:174604
Petersson, Daniel, Ph.D student
Enqvist, Martin, Associate professor