The rapid development of Internet of Things (IoT) technology, together with mobile network technology, has created a never-before-seen world of interconnection, evoking research on how to make it vaster, faster, and safer. To support the ongoing fight against the malicious misuse of networks, in this paper we propose a novel algorithm called AMDES (unmanned aerial system multifractal analysis intrusion detection system) for spoofing attack detection. This novel algorithm is based on both wavelet leader multifractal analysis (WLM) and machine learning (ML) principles. In earlier research on unmanned aerial systems (UAS), intrusion detection systems (IDS) based on...

Drones are commonly used for civil applications and are accessible to those with limited piloting skills in several scenarios. However, the deployment of a fleet in the context of scientific research can lead to complex situations that require an important preparation in terms of logistics, permission to fly from authorities, and coordination during the flights. This paper is a field report of the flight campaign held at the Barbados Island as part of the NEPHELAE project. The main objectives were to fly into trade wind cumulus clouds to understand the microphysical processes involved in their evolution, as well as to provide a proof of concept of sensor-based adaptive...

Precise positioning with a stand-alone GPS receiver or using differential corrections is known to be strongly degraded in an urban or sub-urban environment due to frequent signal masking, strong multipath effect, frequent cycle slips on carrier phase, etc. The objective of this Ph.D. thesis is to explore the possibility of achieving precise positioning with a low-cost architecture using multiple installed low-cost single-frequency receivers with known geometry whose one of them is RTK positioned w.r.t an external reference receiver. This setup is thought to enable vehicle attitude determination and RTK performance amelioration. In this thesis, we firstly proposed a method...

This paper describes an experiment about the relevance of using Cognitive Work Analysis (CWA) to improve the system definition process. CWA is a method for analyzing complex sociotechnical systems from a cognitive point of view. We submitted a set of exercises involving some specification tasks to a group of professional system engineers, some were asked to build on CWA data, while others to rely on some classical method results (Hierarchical Task Analysis). Beyond the results obtained from this specific experiment, this paper aims at demonstrating that controlled experiments are not only possible but also relevant in system engineering field.

In this article, the authors built and used a custom transformer-based model, based on a compact version of RoBERTa, named ASRS-CMFS, to classify aviation incident reports. The classification is applied to fourteen distinct sets of specific aviation incident-related anomalies, such as Aircraft Equipment problems or Altitude Deviation problems. The authors extracted the incident reports and the associated fourteen sets of categories from the Aviation Safety Reporting System. After discussing the choice of evaluation metric, the authors evaluated the model using the Matthews Correlation Coefficient metric. To measure the precision of the scores obtained on the different...

As the number of vehicles equipped with radars sensors is rapidly increasing, the risk of harmful interference is increasing, especially since the radar waveform parameters are not regulated. Interference mitigation techniques are becoming important for radars to operate properly in this complex environment. We presented in a previous study that the use of V2X technology to communicate radars physical properties as well as the parameters of their waveform allows for new anticipation strategies. These strategies focus on identifying potential interferers thanks to V2X communications and adapt the radar waveform to minimize the risk of interference. This article...

As the number of vehicles equipped with radars sensors is rapidly increasing, the risk of harmful interference is rising to undesirable levels, especially since the radar waveform parameters are not regulated. Interference mitigation techniques are becoming very important for radars to operate properly in this complex environment. This article investigates the potential of V2X (Vehicle-to-Everything) technology as a side communication channel between vehicles, to coordinate usage of the radar bandwidth and thus avoid interference. Vehicles equipped with V2X technology can receive information about the upcoming radar waveform parameters of the vehicles in their vicinity...

In this paper, a cross-shaped dielectric resonator antenna arranged in a stacked configuration is proposed to realize a Huygens source in circular polarization at 2.45 GHz ISM band. The antenna principle relies on the combination of two pairs of orthogonal electric and magnetic dipoles. The antenna is designed and optimized with numerical analysis using far-field simulations in Ansys HFSS. It finally has a radiation pattern oriented in one half-space without the use of a ground plane.

The COVID-19 pandemic has profoundly affected the air transportation system, its structure, its reliability, and its dynamics. Passengers have in turn significantly adapted their behavior. Through a case study at Paris-Charles de Gaulle airport, the present paper examines the new traffic network, the fact that delays remain high despite a drop in flight volume, the significant decrease in aircraft load factors and the change in passenger behavior at the airport.