The NATO/PfP Interoperability and Re-use Study, NIREUS, is a thirteen-nation project to apply the High Level Architecture (HLA) to investigate multinational distributed simulation for system design and acquisition. The NIREUS test case concerns distributed simulation of Vertical Take-Off and Landing (VTOL) air vehicles landing on ships, initially focusing on Maritime Unmanned Air Vehicles (MUAV...

Helicopters are valuable since they can land at unprepared sites; however, current unmanned helicopters are unable to select or validate landing zones (LZs) and approach paths. For operation in unknown terrain it is necessary to assess the safety of a LZ. In this paper, we describe a lidar-based perception system that enables a full-scale autonomous helicopter to identify and land in previously...

Optimal scheduling of airport runway operations can play an important role in improving the safety and efficiency of the National Airspace System (NAS). Methods that compute the optimal landing sequence and landing times of aircraft, while delivering high quality solutions, must accommodate practical issues that affect the implementation of the schedule. One such practical consideration, known ...

This thesis presents an assertional-style verification of the aircraft landing protocol of NASA’s SATS (Small Aircraft Transportation System) concept of operation [16] using the timed and untimed I/O automata frameworks. We construct two mathematical models of the landing protocol using the above stated frameworks. First, we study a discrete model of the protocol, in which the airspace of the a...

In this paper, we propose a new approach for formal verification of hybrid systems. To do so, we present a new refinement proof technique, a weak refinement using step invariants. As a case study of the approach, we conduct formal verification of the safety properties of NASA’s Small Aircraft Transportation System (SATS) landing protocol. A new model is presented using the timed I/O automata (T...

The Aviation Safety Reporting System includes over a million confidential reports describing safety incidents. Natural language processing techniques allow for relatively rapid and largely automated analysis of large collections of text data. Meaningful interpretation of the results and further investigations by subject matter experts can follow. This article describes the application of struct...

Formal veriication of safety and timing properties of engineering systems is only meaningful if based on models which are systematically derived. In this paper we report on our experience using switched bond graphs for the modelling of hardware components in hybrid systems. We present the basic ideas underlying bond graphs in general and switched bond graphs in particular. Switched bond graphs ...

This study presents an investigation and evaluation of the control quality automatic system for UAVs in vertical plane under windy conditions. For operational stages general, landing stage is one high-probability that pose a threat to flight safety, especially at time landing. Therefore, evaluate system, authors investigated parameters during UAV The uses PID controller with optimal selected by...