Within the frame of the MAGNET project (multimodal approach for GNSS 1 in European transport), a GNSS-based train positioning platform (TPP) has been developed and tested with the wide area augmentation system pre-EGNOS and a local differential GNSS system using a reference station. This paper presents the principle and the system architecture of the developed GNSS-based train positioning system and highlights the system performance achieved in field tests. The TPP consists of a GNSS core module with an EGNOS (European geostationary navigation overlay service) decoding function, a GSM (global system for mobile communication) data link for local GPS and GLONASS differential corrections, a digital route map and an interface to odometer. The first step to calculate the train position is to select either wide area or local area differential corrections depending on which are available. The position and velocity are then calculated and matched to the track by using the digital route map. Finally, the GNSS position and velocity data is integrated with odometer data in a sensor data fusion model. The integrated solution avoids the masking problem of GNSS signals and reduces odometer errors such as drift and braking slip, so that a continuous positioning availability can be reached and the positioning accuracy can be improved to meter level. The achieved performance is being exploited for industrial applications.
GNSS-based train positioning experiments with local and wide area augmentation
1999
10 Seiten, 9 Bilder, 7 Quellen
Conference paper
English
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