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A reconfiguration method using model-based control allocation scheme is proposed in this paper. A reconfigurable closed-loop control system is established for control of a UAV (unmanned aerial vehicle) fixed wing aircraft in autonomous flight in case of single and multiple control surfaces failures. The control allocation is determined by using of a nonlinear dynamic model of a UAV aircraft. The model...
Complexity is a measure of the difficulty that a particular air traffic situation represents to Air Traffic Controller (ATCo). This measure impacts on ATCo workload, which is an important factor for defining airspace capacity. This paper presents an evaluation of the impact of the insertion of Remotely Piloted Aircraft (RPA) on safety levels within a non-segregated airspace based on the calculation...
UAV flight safety is the first issue of the UAV's attention. The establishment of a UAV flight monitoring system not only meets the needs of the army but also has important significance. This paper introduces the development status and trends of aircraft fault prediction and health management at home and abroad. The key technologies of UAV flight monitoring system are analyzed, Including flight state...
Flying Ad hoc Network (FANET) is an infrastructure-less multi-hop radio ad hoc network in which Unmanned Aerial Vehicles (UAVs) and Ground Control Station (GCS) collaborates to forward data traffic. Compared to the standard Mobile Ad hoc NETworks (MANETs), the FANET architecture has some specific features (3D mobility, low UAV density, intermittent network connectivity) that bring challenges to the...
This paper considers the problem of integrating unmanned aircraft into low altitude airspace above urban environments, including major terminal areas and helicopter landing sites. A simple set of data-driven modelling techniques are used to explore, visualise and assess existing air traffic in a manner more informative to the unmanned aircraft community. First, low altitude air traffic data sets (position...
This paper presents two simple simulation and modelling tools designed to aid in the safety assessment required for unmanned aircraft operations within unsegregated airspace. First, a fast pair-wise encounter generator is derived to simulate the See and Avoid environment. The utility of the encounter generator is demonstrated through the development of a hybrid database and a statistical performance...
Recently, there has been immense interest in using unmanned aerial vehicles (UAVs) for civilian operations such as package delivery, firefighting, and fast disaster response. As a result, UAV traffic management systems are needed to support potentially thousands of UAVs flying simultaneously in the airspace, in order to ensure their liveness and safety requirements are met. Hamilton-Jacobi (HJ) reachability...
This paper studies the path planning for Unmanned Aerial Vehicles (UAVs) under critical situations, where the aircraft has to execute a hard landing. Such critical situations can be provoked by equipment failures or extreme environmental situations that demand the UAV to abort the mission running and to land the aircraft without risk for people, properties and itself. First, a mathematical formulation...
With the proliferation of unmanned aircraft systems in the marketplace and demand for their services, commercial unmanned aircraft systems developers and operators, both large and small have begun to engage in commercial operation of unmanned aircraft at low altitudes, while there has been little assertion that unmanned operations are not subject to jurisdiction of the Federal Aviation Administration...
The growing public interest for Unmanned Air Systems (UAS) applications has stimulated the debate over the integration of this kind of aircraft into the civil aviation system. However, the concept of not having a human pilot inside the aircraft presents uncertainties that may impede the creation of proper regulation. Having safety as the main concern for civil aviation, one important principle of...
During the last years, Europe and USA have made efforts to integrate Unmanned Aerial Vehicles (UAVs) in a non-segregated controlled airspace, aiming at their civilian use. So far, there has been no consensus on the criteria to be adopted by the community to, at least, keep the minimum safety levels as those already attained by international aviation. In this scenario, commercial aircrafts â"...
Integration of UAS (Unmanned Aircraft Systems) into non-segregated airspace remains a major goal to be solved for future acceptance of these systems in air transport. Up to now most civil and military UAS operations are taking place in segregated airspace so that collision avoidance and separation with other traffic is of no concern. To further enable the UAS operational scope, UA (Unmanned Aircraft)...
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