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Abstract(s)
Este relatório apresenta o trabalho realizado no âmbito da unidade curricular de
Tese/Dissertação do Mestrado em Engenharia Electrotécnica e de Computadores
- área de especialização de Telecomunicações.
Pretende-se desenvolver um sistema distribuído de seguimento, no exterior,
de plataformas móveis equipadas com receptores de baixo custo. O sistema deve,
em tempo útil, realizar a aquisição, descodificação e tratamento dos dados emiti-
dos pelo Global Navigation Satellite System (GNSS), das observações efectuadas
pelo receptor e da informação proveniente do European Geostationary Navigation
Overlay System (EGNOS). O objectivo é determinar, a partir deste conjunto de
informação e para cada plataforma ligada, a posição em modo absoluto, as correcções diferenciais e, finalmente, a posição em modo diferencial.
Optou-se por receber as correcções diferenciais de área alargada do EGNOS
através da Internet, permitindo, assim, que receptores sem capacidade de receber
directamente informação do EGNOS possam também usufruir desta fonte de
informação complementar.
As correcções diferenciais a aplicar às observações de cada receptor são geradas
através do conceito de estacão de referência virtual - Virtual Reference Station
(VRS) - a partir da posição aproximada do receptor e das correcções de área
alargada provenientes do EGNOS.
A determinação da posição em modo diferencial das plataformas móveis é
efectuada segundo o conceito de Inverted Di®erential Global Navigation Satellite
System (IDGNSS) e utilizando uma arquitectura do tipo Cliente-Servidor.
Por último, os resultados, que são armazenados numa base de dados, são
disponibilizados ao utilizador através de uma aplicação Web. O utilizador pode,
assim, efectuar o seguimento de qualquer plataforma móvel ligada ao sistema a
partir de qualquer dispositivo com navegador e acesso à Internet.
This report presents the project developed for the Thesis/Dissertation module of the Master Degree in Electrical Engineering and Computers, Telecommunications specialization area. The goal is to the develop a distributed system for the outdoor tracking of mobile platforms - rovers - equipped with low-cost Global Navigation Satellite Systems (GNSS) receivers. This is achieved through the acquisition, decoding and processing of GNSS and GNSSS-related data, including the navigation message and observations collected by the receivers and the wide-area correction data from the European Geostationary Navigation Overlay System (EGNOS). The system, first, determines, for each rover, the absolute position, the differential corrections and the differential position and, then, displays the rovers differential positions through a Web application. The EGNOS wide-area corrections are acquired through the Internet to ensure that the access to this data source does not depend on the type of receiver or on the local receiving conditions. The individual differential corrections are generated from the approximate position of each receiver and the EGNOS wide-area corrections according to the Virtual Reference Station (VRS) concept. The individual differential position is determined according to the Inverted Differential Global Navigation Satellite System (IDGNSS) concept using a client- server architecture. Finally, the differential positioning solutions, after being stored in a database, are displayed over a map through a Web application. This way, the user simply requires a device with a browser and an Internet connection to track any rover connected to this system.
This report presents the project developed for the Thesis/Dissertation module of the Master Degree in Electrical Engineering and Computers, Telecommunications specialization area. The goal is to the develop a distributed system for the outdoor tracking of mobile platforms - rovers - equipped with low-cost Global Navigation Satellite Systems (GNSS) receivers. This is achieved through the acquisition, decoding and processing of GNSS and GNSSS-related data, including the navigation message and observations collected by the receivers and the wide-area correction data from the European Geostationary Navigation Overlay System (EGNOS). The system, first, determines, for each rover, the absolute position, the differential corrections and the differential position and, then, displays the rovers differential positions through a Web application. The EGNOS wide-area corrections are acquired through the Internet to ensure that the access to this data source does not depend on the type of receiver or on the local receiving conditions. The individual differential corrections are generated from the approximate position of each receiver and the EGNOS wide-area corrections according to the Virtual Reference Station (VRS) concept. The individual differential position is determined according to the Inverted Differential Global Navigation Satellite System (IDGNSS) concept using a client- server architecture. Finally, the differential positioning solutions, after being stored in a database, are displayed over a map through a Web application. This way, the user simply requires a device with a browser and an Internet connection to track any rover connected to this system.
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Instituto Politécnico do Porto. Instituto Superior de Engenharia do Porto