Uso de modelo regional na mitigação dos efeitos da ionosfera em observações com receptores GPS de uma frequência.

• Autor(a) principal: Carvalho, Leandro Teixeira de
• Data de Publicação: 2010
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/3730
• topic: Ionosfera; Modelo regional; GPS; VTEC; Série de Fourier; Ionospheric; Regional model; GPS; VTEC; Fourier series; CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEODESIA

Currently, the greatest source of systematic error in positioning with frequency receptors is ionospheric refraction. Therefore it is necessary to provide a more effective strategy to minimize ionospheric effects which has been investigated using regional models. In this study, a model using a Fourier series to represent the ionosphere in Brazil was utilized. Parameters of the model were estimated by adjusting to observed data, where input data were those collected from stations of the Rede Brasileira de Monitoramento Contínuo (RBMC). With the objective of validating the model, Precise Point Positioning of the VICO station of the RBMC was performed on certain days of the year using four strategies which are: L1 and L2, L1 without correction, L1 with correction by the model proposed in this study and L1 with correction by the VTEC maps of the IGS. The obtained coordinates were compared with the official coordinates provided by the IBGE, showing a better average given by the proposed model in relation to positioning with no correction, of 65% and 90% for the resultant discrepancies and geometric height, respectively.