Conference Presentations by JOSÉ ALEXANDRE T . G . FREGNANI
XX SITRAER, 2023
A go-around is a relevant safety event that may occur during the approach phase of the flight due... more A go-around is a relevant safety event that may occur during the approach phase of the flight due to several reasons such as unstable approach, loss of separation or adverse weather. In dense terminal areas, this maneuver can generate significant additional Air Traffic Control (ATC) workload as it requires a quick and accurate reaction to reintegrate the flight into the traffic flow and immediately establish a new approach and landing sequence. In current operations, air traffic controllers typically become aware of a go-around during or after their execution, which leads to a very short time horizon for decision-making. This research aims to evaluate the operational impacts of a real-time monitoring and alerting solution for ATC decision support in approach control facilities and aerodrome control towers. Based on a human-in-the-loop simulation of air traffic operations at the Sao Paulo/Guarulhos International Airport, we assess how the presence of an alert that anticipates the occurrence of a go-around affects the ATC performance. The results showed an increase in the perceived levels of situation awareness and safety as well as an increase in the efficiency of ATC decisions concerning the go-around, with an observed reduction of nearly two minutes in the flight time from the start of the maneuver and the landing when the alert was active.
XX SITRAER, 2023
A go-around is a relevant safety event that may occur during the approach phase of the flight due... more A go-around is a relevant safety event that may occur during the approach phase of the flight due to several reasons such as unstable approach, loss of separation or adverse weather. In dense terminal areas, this maneuver can generate significant additional Air Traffic Control (ATC) workload as it requires a quick and accurate reaction to reintegrate the flight into the traffic flow and immediately establish a new approach and landing sequence. In current operations, air traffic controllers typically become aware of a go-around during or after their execution, which leads to a very short time horizon for decision-making. This research aims to evaluate the operational impacts of a real-time monitoring and alerting solution for ATC decision support in approach control facilities and aerodrome control towers. Based on a human-in-the-loop simulation of air traffic operations at the Sao Paulo/Guarulhos International Airport, we assess how the presence of an alert that anticipates the occurrence of a go-around affects the ATC performance. The results showed an increase in the perceived levels of situation awareness and safety as well as an increase in the efficiency of ATC decisions concerning the go-around, with an observed reduction of nearly two minutes in the flight time from the start of the maneuver and the landing when the alert was active.
DASC IEEE, 2023
The advent of the Performance-Based Navigation (PBN) concept supported by Global Navigation Satel... more The advent of the Performance-Based Navigation (PBN) concept supported by Global Navigation Satellite Systems (GNSS) has brought significant changes in airspace design, resulting in more direct, flexible and precise routes worldwide. With the evolution of integrity monitoring algorithms, satellite navigation systems also have the potential to support approach operations with more stringent performance requirements, even in equatorial and low altitude regions impacted by ionospheric scintillation, providing several operational benefits. In particular, airports that currently lack the ground-based infrastructure required for instrument approaches can benefit from increased accessibility during adverse weather conditions. In this paper, we evaluate the potential implementation of new GNSS-based approach procedures-specifically, RNP 0.1 and LPV-250-at Navegantes International Airport (SBNF) in Brazil based on the use of multi-constellation and multi-frequency signals enabled by the Advanced Receiver Autonomous Integrity Monitoring (ARAIM) algorithm. The availability provided by ARAIM was compared with the ones obtained with the currently used RAIM algorithm. For this, data from a GNSS receiver located at a similar geomagnetic latitude as SBNF is analyzed. The services availability arranged by day and hour demonstrate the best time window for operations considering ionospheric scintillation occurrences. These results are crossed with historical weather data to evaluate the additional SBNF accessibility provided by potential implementations of more stringent approach procedures with lower weather minima supported by ARAIM, in comparison with the RNP 0.2 approach procedures currently implemented at the airport. The resulting operational benefits are then quantified through the potential savings that could be achieved with the reduction of flight diversions due to adverse weather.
Actas del Primer Congreso de la Red Iberoamericana de Investigación en Transporte Aéreo, 2007
There is a trend in which the airports are being treated like great gates of access to the cities... more There is a trend in which the airports are being treated like great gates of access to the cities, where they are not considered just terminal, but have a programmatically content and perform an essential rule in the economy of a country. Considering the importance and the quick growth of the air transportation industry, there is the necessity of a most effective participation of the Brazilian airports like basic agents to guarantee a process of continuous development for the country. It is necessary to revise essential administrative practices and to analyze conditions so that they can be dynamic to accompany the development of the air sector. So, this work aims to argue about the considerations of redefinition of the current model of airport administration in Brazil, questioning the strategy of privatization of airports.
ITSC 2019 Conference, 2019
Air traffic flow Management aims to control route network flow on regions in which the service is... more Air traffic flow Management aims to control route network flow on regions in which the service is provided. One important challenge is to guarantee that aircraft are able to departure and land safely, with minimum delay. To satisfy this requirement, several restrictive measures are employed, such as: ground delay programs, en-route decelerations, holding patterns at intermediate altitudes (descent and approach phases), and diversions to less congested airports. The problem becomes how to better distribute these measures among the involved entities. In this paper, a new model is proposed to tackle this problem, named RELEASE, which utilizes reinforcement learning techniques to train agents to better negotiate their delays with other aircraft. To do so, the negotiation process was modeled as a Markov Decision Process. The aircraft is considered as agent and the related agents were then trained to negotiate their position in the environment with other aircraft through time offers with an associated reward. The learning behavior was compared to a reference model. In the case studies, the agents were able to achieve similar results as the reference model, and even getting better results for agents with greater operational costs than their predecessors.
Transporte em Transformação XII - Trabalhos vencedores do Prêmio CNT Produção Acadêmica 2007
Resumo Neste trabalho propõe-se um modelo de programação linear cujo objetivo é determinar o abas... more Resumo Neste trabalho propõe-se um modelo de programação linear cujo objetivo é determinar o abastecimento de quantidades ótimas de combustível ao longo de uma malha de vôos de uma empresa aérea doméstica brasileira. Assumindo que não há restrições de venda de volume ou capacidade de armazenamento em cada localidade, efetua-se a análise para o caso de uma aeronave em um dia de sua programação, extrapolando os resultados para projeções mensais e anuais. Através do modelo proposto, verifica-se que tal técnica de tanqueamento de combustível provê ganhos econômicos da ordem de 5%, porém produz um consumo adicional de combustível da ordem de 1%. Uma discussão do impacto ambiental de tal procedimento também é proposta.
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Conference Presentations by JOSÉ ALEXANDRE T . G . FREGNANI