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International Journal of Sustainable Aviation (2 papers in press)
Fault-tolerant estimation of satellite orbital states by Tuncay Yunus Erkeç, Chingiz Hajiyev Abstract: This paper is devoted to global positioning system (GPS)-based fault-tolerant satellite orbital states estimation which is used for the pseudo-ranging model. GPS is widely used by many researchers to determine the orbit state vectors of satellites, but errors in GPS measurements can cause major errors in satellite location detection. Therefore, there is a need for an architecture that will resist possible measurement errors and GPS malfunctions. This study aims to present the novel approaches to tolerate the errors that may take place in GPS measurements. The satellite localisation has been detected via a pseudo-ranging model between four GPS satellites and the target satellite. The Keplerian equations and orbit elements are used for the satellite dynamic model with orbital J2 perturbation which is due to the flattened shape of the earth is taken into account via the extended Kalman filter (EKF) algorithms. The reconfigurable and the adaptive version of fault-tolerant localisation architecture eliminate the GPS measurement errors during estimating satellite position vectors. The comparison of the prediction architectures of the fault tolerant satellite state vectors originally proposed. At the same time, it is possible to use fault tolerant architectures designed to detect whether GPS satellites are malfunctioning or not. Keywords: satellite localisation; global positioning system; GPS; fault-tolerant Kalman filter; adaptive Kalman filter; AKF; orbital localisation; extended Kalman filter; EKF. DOI: 10.1504/IJSA.2021.10040510
Take flying to the masses: a regulatory governance perspective by Brajesh Mishra, S.K. Tapasvi, Abinash Panda Abstract: This paper investigates why the Indian civil aviation sector, liberalised back in the 1990s, could not adequately promote regional air connectivity. It has identified various regulatory gaps and measures needed to attain the civil aviation policy goal take flying to masses. An exploratory case study approach has been adopted since the study deals with a specific issue, namely, regional and remote air-connectivity in India. The case context is built up by collating information about: 1) the structure and performance of the aviation industry; 2) related policy/regulatory governance framework. Data collection from multiple sources (research articles, industry reports, regulatory/policy documents, and semi-structured interviews with experts) has resulted in the triangulation of data and enriched analysis, thereby ensuring greater reliability and validity of research outcomes. This study's findings add to the academic knowledge space of regulation in the global south, particularly
regulatory implementation in the Indian civil aviation sector.
Keywords: Indian civil aviation; regional air connectivity; regulatory governance; aviation industry; viability gap funding; policy initiatives. DOI: 10.1504/IJSA.2021.10041123