Emanoel Costa

Spatial Characteristics of GNSS Fading and Scintillation in Low Latitudes

Victor Di Santis, Alison de Oliveira Moraes, Emanoel Costa, Jonas Sousasantos et autres

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AB0467 PREDICTIVE FACTORS OF THE FIRST BDMARD SWITCH IN PSORIATIC ARTHRITIS PATIENTS

Carlos Ferreira, Ana Margarida Correia, Pedro Pereira, Emanoel Costa et autres

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Characterization of Scintillation Events With Basis on L1 Transmissions From Geostationary SBAS Satellites

Alison de Oliveira Moraes, Jonas Sousasantos, Emanoel Costa, Bruno Augusto Pereira et autres

Abstract Signals recorded by two stations in the Brazilian region: [Fortaleza (3.74°S, 38.57°W) and Inconfidentes (22.31°S, 46.32°W)], receiving L1 transmissions from different geostationary satellites, were used to evaluate the amplitude scintillation index S4 and several characteristics of scintillation events (continuous record with …

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Ionospheric scintillation simulation based on neural networks

Moisés J. S. Freitas, Alison de Oliveira Moraes, Emanoel Costa, Marcos R. O. A. Máximo et autres

Thereis a demand for the development of GNSS positioning processing techniques that are more tolerant to the effects of the low latitude ionosphere (in particular, scintillation). The possibility of simulating scintillating channels supports the development of more sophisticated test benches and receivers. …

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Space Diversity Mitigation Effects on Ionospheric Amplitude Scintillation With Basis on the Analysis of GNSS Experimental Data

Emanoel Costa, Alison de Oliveira Moraes, E. R. de Paula, João Francisco Galera Monico

Ionospheric density irregularities embedded in Equatorial Plasma Bubbles (EPBs), with scale sizes varying from several hundred kilometers to several tens of meters, may cause amplitude and phase scintillation of transionospheric radio waves, degrading the performance and availability of space-based communication and navigation …

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Fading of Wideband Signals Due to Propagation Through Equatorial Plasma Bubbles and Diversity Mitigation Effects

Emanoel Costa, Chao‐Song Huang, R. G. Caton, P. A. Roddy

Equatorial Plasma Bubbles (EPBs) and their ionospheric density irregularities exhibit structures with scale sizes that can vary from several hundred kilometers to tens of meters. These random irregularities degrade both the performance and the availability of space-based communication and navigation systems in …

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Variability of Vertical Total Electron Content Gradients in the Brazilian Sector

Teddy Modesto Surco Espejo, Emanoel Costa, E. R. de Paula, Alison de Oliveira Moraes et autres

Ground Based Augmentation Systems are designed to meet demanding requirements during airport approach and landing sections of aircraft routes. It computes corrected and smoothed differential corrections and other information. These messages are transmitted to aircraft, which may use the corrections to improve …

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A GPS signal-in-space simulation model for equatorial and low latitudes in the Brazilian longitude sector

Teddy Modesto Surco Espejo, Emanoel Costa, Alison de Oliveira Moraes, A. R. F. Martinon et autres

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The GNSS NavAer INCT Project Overview and Main Results

João Francisco Galera Monico, E. R. de Paula, Alison de Oliveira Moraes, Emanoel Costa et autres

Air navigation is increasingly dependent on the use of Global Navigation Satellite Systems (GNSS). It allows the determination of the aircraft’s position in all phases of the flight and brings many advantages. Although GNSS navigation results in gains, the radio signals from …

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Ionospheric Equatorial Plasma Bubble effects on L1 single frequency code GPS positioning using precise ephemerides

Alison de Oliveira Moraes, Bruno César Vani, Emanoel Costa, João Francisco Galera Monico

Amplitude and phase variations of Global Navigation Satellite Systems (GNSS) radio signals used by the aeronautic community occur due to ionospheric irregularities (ionospheric scintillation), which may cause the degradation of service availability and performance, raising safety issues. This is particularly true in …

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Broadband Channel Characterization in Wooded Environment in the 26 GHz Band

Jean Carneiro da Silva, Diego K. N. da Silva, Leslye Estefania Castro Eras, Nadson Welkson Pereira de Souza et autres

The present work describes the use of a simulation model based on asymptotic methods (ray tracing) on the propagation of ultra-wideband radio signals in a densely-arborized urban channel. The model was previously validated and adjusted using data obtained from measurement campaigns in …

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A Ray-Tracing Model for Millimeter-Wave Radio Propagation in Dense-Scatter Outdoor Environments

Jean Carneiro da Silva, Emanoel Costa

The future saturation of the electromagnetic spectrum currently allocated for mobile communications has led the scientific and technical communities to consider the use of the vast millimeter-wave frequency band. However, there are technical obstacles limiting the immediate use of this band. In …

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