| 1. Identificação | |
| Tipo de Referência | Slides (Audiovisual Material) |
| Site | mtc-m16c.sid.inpe.br |
| Código do Detentor | isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S |
| Identificador | 6qtX3pFwXQZQjxQKYCT/JNu8f |
| Repositório | sid.inpe.br/ePrint@1905/2006/01.17.17.56 |
| Última Atualização | 2006:01.17.17.07.15 (UTC) marciana |
| Repositório de Metadados | sid.inpe.br/ePrint@1905/2006/01.17.17.56.13 |
| Última Atualização dos Metadados | 2018:06.04.04.12.37 (UTC) administrator |
| Chave Secundária | INPE-13325-MAO/4 |
| Chave de Citação | PaulaKantReze:2004:ChGPSi |
| Título | Characteristics of the GPS signal scintillation during ionospheric irregulaties and their effects over the GPS system  |
| Formato | On-line |
| Ano | 2004 |
| Data de Acesso | 17 maio 2024 |
| Número de Arquivos | 1 |
| Tamanho | 3716 KiB |
| 2. Contextualização | |
| Autor | 1 Paula, Eurico Rodrigues de 2 Kantor, Ivan Jelinek 3 Rezende, L. F. C. de |
| Grupo | 1 DAE-INPE-MCT-BR |
| Afiliação | 1 Instituto Nacional de Pesquisas Espaciais (INPE) |
| Nome do Evento | Simpósio Brasileiro de Engenharia Inercial (SBEIN), 4 |
| Localização do Evento | São José dos Campos |
| Data | 17 - 19 nov. |
| Editora (Publisher) | Instituto Nacional de Pesquisas Espaciais |
| Cidade da Editora | São José dos Campos |
| Histórico (UTC) | 2006-08-28 18:43:58 :: jefferson -> administrator :: 2007-11-08 21:02:13 :: administrator -> jefferson :: 2008-04-18 21:37:29 :: jefferson -> administrator :: 2014-09-29 15:59:35 :: administrator -> marciana :: 2004 2015-11-23 12:28:57 :: marciana -> administrator :: 2004 2018-06-04 04:12:37 :: administrator -> jefferson :: 2004 |
| 3. Conteúdo e estrutura | |
| É a matriz ou uma cópia? | é a matriz |
| Estágio do Conteúdo | concluido |
| Transferível | 1 |
| Resumo | The ionospheric irregularities can give origin to amplitude and phase scintillations in the GPS signal and can affect telecommunication systems. In this work we present briefly the physical mechanisms that give origin to the ionospheric irregularities, and their dependence with season, local time, solar activity and magnetic activity. Following we will describe the potential effects of the scintillations on the GPS systems, like the loss of lock, increase of the dilution of precision (DOP), decrease on the available number of GPS satellites and effects on the WAAS (Wide Area Augmentation System) navigation and positioning system. This study was based on L1 (1.575 GHz) GPS signal amplitude scintillations measured by an array of 11 Scintillation Monitors located over the Brazilian territory. The GPS data were recorded at 50 samples/sec and the scintillation index S4 was used to quantify the scintillation intensity. Over the Brazilian territory the ionospheric irregularities incidence is normally from September to March, however they can be triggered at any month of the year during the incidence of a magnetic storm. The ionospheric irregularities incidence and intensity increase with the increase of the solar cycle. The irregularities are generated at equatorial region after sunset due to plasma instability processes and they occur in the pre-midnight time sector and after midnight during some magnetic storms. The ionospheric irregularity amplitudes are largely dependent of the ionospheric background ionization and over the Brazilian territory there are large ionization gradients from equator to low latitudes due to the Equatorial Anomaly. Due to this anomaly the Total Electron Content (TEC) presents 2 peaks at about 15o S and 15 o N of magnetic latitude and a decrease at equatorial latitudes, and as a consequence the ionospheric irregularities give origin to larger amplitudes close to these crests. For instance stations like São José dos Campos and Cachoeira Paulista are under the Equatorial Anomaly peaks. The ionospheric irregularities can cause large fades on the GPS signal for stationary receivers that can cause losses of lock (tracking) that can persist for tens of seconds. As the ionospheric irregularity patterns (bubbles) drift in the east-west direction with about 150 m/s, for moving receivers like landing aircrafts, which have almost same velocity, the fades can be potentially much longer causing even longer tracking losses. In this work we show some statistics of loss of lock occurrence during ionospheric irregularities. One consequence of tracking loss is an increase in the dilution of precision due to the GPS satellite loosing, what increases the navigation errors. In severe conditions of irregularities incidence the number of tracked satellites may fall below 4 that is the minimum amount for calculating navigational solutions. |
| Área | CEA |
| Arranjo | urlib.net > BDMCI > Fonds > Produção anterior à 2021 > DIDAE > Characteristics of the... |
| Conteúdo da Pasta doc | acessar |
| Conteúdo da Pasta source | não têm arquivos |
| Conteúdo da Pasta agreement | não têm arquivos |
| 4. Condições de acesso e uso | |
| URL dos dados | http://urlib.net/ibi/6qtX3pFwXQZQjxQKYCT/JNu8f |
| URL dos dados zipados | http://urlib.net/zip/6qtX3pFwXQZQjxQKYCT/JNu8f |
| Arquivo Alvo | DePaulaetAlii.pdf |
| Grupo de Usuários | administrator jefferson |
| Visibilidade | shown |
| Permissão de Leitura | allow from all |
| Permissão de Atualização | não transferida |
| 5. Fontes relacionadas | |
| Unidades Imediatamente Superiores | 8JMKD3MGPCW/3ETL868 |
| Divulgação | <E> |
| Acervo Hospedeiro | sid.inpe.br/mtc-m18@80/2008/03.17.15.17 |
| 6. Notas | |
| Campos Vazios | archivingpolicy archivist booktitle callnumber contenttype copyholder copyright creatorhistory descriptionlevel doi e-mailaddress electronicmailaddress isbn issn keywords label language lineage mark mirrorrepository nextedition notes numberofslides orcid parameterlist parentrepositories previousedition previouslowerunit progress project readergroup resumeid rightsholder schedulinginformation secondarydate secondarymark secondarytype session shorttitle sponsor subject tertiarymark tertiarytype type url versiontype volume |
| 7. Controle da descrição | |
| e-Mail (login) | jefferson |
| atualizar | |