Airborne DFMC SBAS Receiver L5/E5a RFI Test Conditions
A. Garcia-Pena, C. Macabiau, Ecole Nationale de l’Aviation Civile; G. Novella, DSNA/DTI; D. Bouvet, Thales AVS; M. Mabilleau, EUSPA; S. Kalyanaraman, Collins Aerospace
Date/Time: Friday, Sep. 15, 3:20 p.m.
Global Navigation Satellite System (GNSS) signal processing for civil aviation is prone to disruptions from various Radio Frequency Interferences (RFI) such as noise, multipath, and other interferences. The essence of this paper is to explore the impacts of these RFIs, specifically on the L5/E5a band, which is crucial for future airborne GNSS receivers in civil aviation. Several established standardization organizations, like ICAO, RTCA, and EUROCAE, have been considering RFI with RTCA/DO-292. undergoing updates to account for the evolving RFI landscape influenced by various systems like DME/TACAN, JTIDS/MIDS, LDACS, and SSR equipment. The current review aims to consolidate the overall link budget margin, which is anticipated to be minimal. This is achieved by revisiting elements such as the analytical model denoting AGC/ADC effects and temporal blanker, the impacts of DME/TACAN and JTIDS/MIDS environments on GNSS L5/E5a receiver, and considerations for SSR and LDACS. A significant portion of the paper delves into the effective noise N_0_eff impact on a GNSS receiver, highlighting the importance of setting the right threshold for the blanking method to counteract pulse interference, a common challenge in civil aviation. This interference, both pulsed (DME/TACAN and JTIDS/MIDS) and continuous GNSS interference, affects the signal quality. In summary, this paper presents an in-depth analysis of RFIs on GNSS receivers, providing insights into critical civil aviation scenarios. It introduces a model for L5/E5a receiver, revisits the N_0_eff and R_1 model, delineates specific civil aviation situations for link budget calculations, updates the potential impact of various interference sources, presents C/N0 link budgets, and concludes with insights on the implications of these new situations.
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