Efectos relativistas en los sistemas Galileo, GPS y GLONASS
  Nowadays, the Global Navigation Satellite Systems (GNSS), working like global positioning systems, are the GPS (NAVSTAR) and the GLONASS, which only are operative when several relativistic effects are corrected. In the next years the Galileo system will be constructed, copying the GPS System if there is no an alternative project. In this work, it will be exposed that there is one alternative to the mere copy by means of the SYPOR project, using relativistic concepts, and without utilize the Newtonian ideas that are in the basic conception, so much of the GPS as of the GLONASS. According to the SYPOR project, the Galileo system would be exact, with no need of corrections, and it would have additional technological advantages. 
J.-F. Pascual-S\'anchez