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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Statistical evaluation of GLONASS amplitude scintillation over low latitudes in the Brazilian territory

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Moraes, Alison de Oliveira [1] ; Muella, Marcio T. A. H. [2] ; de Paula, Eurico R. [3] ; de Oliveira, Cesar B. A. [4] ; Terra, William P. [5] ; Perrella, Waldecir J. [4] ; Meibach-Rosa, Pamela R. P. [2]
Total Authors: 7
[1] IAE, BR-12228904 Sao Jose Dos Campos, SP - Brazil
[2] Univ Vale Paraiba UNIVAP, Inst Pesquisa & Desenvolvimento, BR-12244000 Sao Jose Dos Campos, SP - Brazil
[3] INPE, BR-12227010 Sao Jose Dos Campos, SP - Brazil
[4] ITA, BR-12228900 Sao Jose Dos Campos, SP - Brazil
[5] EMBRAER, BR-12247004 Sao Jose Dos Campos, SP - Brazil
Total Affiliations: 5
Document type: Journal article
Source: Advances in Space Research; v. 61, n. 7, p. 1776-1789, APR 1 2018.
Web of Science Citations: 7

The ionospheric scintillation, generated by the ionospheric plasma irregularities, affects the radio signals that pass through it. Their effects are widely studied in the literature with two different approaches. The first one deals with the use of radio signals to study and understand the morphology of this phenomenon, while the second one seeks to understand and model how much this phenomenon interferes in the radio signals and consequently in the services to which these systems work. The interest of several areas, particularly to those that are life critical, has increased using the concept of satellite multi-constellation, which consists of receiving, processing and using data from different navigation and positioning systems. Although there is a vast literature analyzing the effects of ionospheric scintillation on satellite navigation systems, the number of studies using signals received from the Russian satellite positioning system (named GLONASS) is still very rare. This work presents for the first time in the Brazilian low-latitude sector a statistical analysis of ionospheric scintillation data for all levels of magnetic activities obtained by a set of scintillation monitors that receive signals from the GLONASS system. In this study, data collected from four stations were used in the analysis; Fortaleza, Presidente Prudente, Sao Jose dos Campos and Porto Alegre. The GLONASS L-band signals were analyzed for the period from December 21, 2012 to June 20, 2016, which includes the peak of the solar cycle 24 that occurred in 2014. The main characteristics of scintillation presented in this study include: (1) the statistical evaluation of seasonal and solar activity, showing the chances that an user on similar geophysical conditions may be susceptible to the effects of ionospheric scintillation; (2) a temporal analysis based on the local time distribution of scintillation at different seasons and intensity levels; and (3) the evaluation of number of simultaneously affected channels and its effects on the dilution of precision (DOP) for GNSS users are also presented in order to alert the timetables in which navigation will be most susceptible to such effects, as well as statistics on simultaneously affected channels. Relevant results about these statistical characteristics of scintillation are presented and analyzed providing relevant information about availability of a navigation system. (C) 2017 COSPAR. Published by Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 06/04008-2 - GNSS: investigations and applications in geodetic positioning, in studies related to the atmosphere and precision agriculture
Grantee:Joao Francisco Galera Monico
Support type: Research Projects - Thematic Grants