Real time kinematic global navigation satellite systems in railroad transportation

2010 ◽  
Author(s):  
Peter Joseph Dailey
Keyword(s):  
Real Time ◽  
Global Navigation Satellite Systems ◽  
Navigation Satellite ◽  
Satellite Systems ◽  
Railroad Transportation ◽  
Real Time Kinematic ◽  
Global Navigation ◽  
Global Navigation Satellite

scholarly journals Monitoramento estrutural em obras viárias utilizando a técnica RTK/NTRIP: Análise dos dados, desenvolvimento e implementação de um sistema de alerta posicional

2021 ◽  
Vol 10 (8) ◽  
pp. e3410816846
Author(s):  
Fabiane de Fátima Maciel ◽  
Herida dos Reis Silva ◽  
Fábio Luiz Albarici ◽  
Luciano Aparecido Barbosa ◽  
Jorge Luiz Alves Trabanco
Keyword(s):  
Real Time ◽  
Global Navigation Satellite Systems ◽  
Navigation Satellite ◽  
Satellite Systems ◽  
Real Time Kinematic ◽  
Global Navigation ◽  
Global Navigation Satellite

Desde a ampliação do sistema rodoviário no Brasil na década de 1930, tem-se um cenário com inúmeras obras viárias em diferentes condições de uso e segurança. Tal fato é preocupante devido à falta de monitoramento adequado em OAEs (Obras de Arte Especiais) e por quem de fato estas estruturas devem ser monitoradas. Estas estruturas estão sujeitas às ações de forças estáticas e dinâmicas, podendo causar deslocamentos e/ou deformações que se caracterizam por sua amplitude, direção e comportamento temporal. Há também processos de deteriorações, sejam por desgaste ao uso ou por solicitações naturais, levando-se ao enfraquecimento da estrutura. A incorporação de métodos de inspeção e monitoramento no comportamento estrutural em OAEs torna-se crescente devido ao alto custo de recuperação destas obras. Contudo, é necessário que haja um plano de monitoramento contínuo ou periódico, de acordo com as grandezas admissíveis de cada estrutura. A tecnologia dos GNSS (Global Navigation Satellite Systems) por meio da metodologia de levantamento RTK (Real Time Kinematic), mostrou-se capaz de oferecer suporte em tempo real no controle de deformações estruturais. Neste contexto, foi desenvolvido o SiGE (Sistema de Gerenciamento Estrutural) para monitoramento e emissão de alertas acerca de eventos previamente determinados pelo operador do sistema. Com a obtenção destes dados em tempo real, é possível avaliar a segurança da estrutura em serviço, monitorar a estrutura de forma contínua e segura e aprimorar projetos futuros com a definição de deslocamentos estruturais máximos.

scholarly journals Optimizing Global Navigation Satellite Systems network real-time kinematic infrastructure for homogeneous positioning performance from the perspective of tropospheric effects

2020 ◽  
Vol 476 (2242) ◽  
pp. 20200248
Author(s):  
Chen Yu ◽  
Nigel T. Penna ◽  
Zhenhong Li
Keyword(s):  
Real Time ◽  
Global Navigation Satellite Systems ◽  
Transport Systems ◽  
Tropospheric Delay ◽  
Positional Error ◽  
Navigation Satellite ◽  
Satellite Systems ◽  
Real Time Kinematic ◽  
Global Navigation ◽  
Global Navigation Satellite

Real-time centimetre-level precise positioning from Global Navigation Satellite Systems (GNSS) is critical for activities including landslide, glacier and coastal erosion monitoring, flood modelling, precision agriculture, intelligent transport systems, autonomous vehicles and the Internet of Things. This may be achieved via the real-time kinematic (RTK) GNSS approach, which uses a single receiver and a network of continuously operating GNSS reference stations (CORS). However, existing CORS networks have often been established simply by attempting regular spacing or in clusters around cities, with little consideration of weather, climate and topography effects, which influence the GNSS tropospheric delay, a substantial GNSS positional error and which prevents homogeneous RTK accuracy attainment. Here, we develop a framework towards optimizing the design of CORS ground infrastructure, such that tropospheric delay errors reduce to 1.5 mm worth of precipitable water vapour (PWV) globally. We obtain average optimal station spacings of 52 km in local summer and 70 km in local winter, inversely related to the atmospheric PWV variation, with denser networks typically required in the tropics and in mountainous areas. We also consider local CORS network infrastructure case studies, showing how after network modification interpolated PWV errors can be reduced from around 2.7 to 1.4 mm.

scholarly journals Study the capabilities of RTK Multi GNSS under forest canopy in regions of Indonesia

2019 ◽  
Vol 94 ◽  
pp. 01021 ◽  
Author(s):  
Heri Andreas ◽  
Hasanuddin Zainal Abidin ◽  
Dina Anggreni Sarsito ◽  
Dhota Pradipta
Keyword(s):  
Real Time ◽  
Forest Canopy ◽  
Global Navigation Satellite Systems ◽  
Navigation Satellite ◽  
Satellite Systems ◽  
Position Accuracy ◽  
The Earth ◽  
Real Time Kinematic ◽  
The Future ◽  
Global Navigation Satellite

For more than two decade, the position on the earth can be precisely determined “real-time” in the order of few centimeters by Real Time Kinematic (RTK) GNSS (Global Navigation Satellite Systems) Method. Nevertheless, few limitations are still recognized such as degradation of accuracy against limited satellite visibilities (e.g. heavy satellite obstructions from forest canopy). It usually takes time to resolve the ambiguities or even in many occasion resulted in failure. Fortunately since recent years to the future seems more satellite systems beside GPS and GLONASS are being launched such as BEIDOU, GALILEO, QZSS, etc. It means that more satellite will be existed above the sky. The term GNSS has changed into Multi GNSS. This Multi GNSS is theoretically adding the value to previous GNSS System like GPS; problems of limited satellite visibilities (e.g. under forest canopy) to the position accuracy perhaps will reduce. Within this paper we try to do study the capabilities of RTK Multi GNSS under forest canopy in Indonesia. We observed by RTK in the forest areas which have canopy of 40 to 90 percent. As conclusion we found improvement in positioning result of even area of very limited satellite visibilities.

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