Multi-Constellation Augmentation Based on EGNOS and Galileo Simulation

摘要

Under a contract offered by the Galileo Joint Undertaking, the Finnish Geodetic Institute, Institute Engineering Surveying and Space Geodesy of the University of Nottingham, and the Chinese Academy of Surveying and Mapping and are now prototyping a multi-constellation augmentation service based on the EGNOS signal in space and Galileo simulation. The context of the project covers the prototype development of a SBAS message encoder to generate the SBAS messages for both GPS and Galileo; a simulator for simulating the Galileo-related augmentation corrections and raw measurements; an Internet broadcaster for disseminating the augmentation signals over the wireless Internet; a central processing facility for real-time estimation of the ionospheric delays, and a Pocket PC-based user terminal for demonstrating the multi-constellation augmentation service. rnThis paper provides a brief description of the system prototyped in the project and presents the preliminary test results for the test carried out in Helsinki. The horizontal and vertical protection levels of the augmented GPS/Galileo service are evaluated and compared to that of the single constellation augmentation solutions. The test results demonstrated that the augmented GPS/Galileo solution performed better than that of the single constellation solution (either GPS or Galileo).