Review of tropospheric, ionospheric and multipath data and models for global navigation satellite systems

The implementation of the European Galileo navigation system and the design of its future evolution require a proper modelling of the effects introduced by the atmosphere (tropospheric and ionospheric) and by multipath from the environment surrounding the navigation receiver. All those effects combine to reduce the performance (accuracy, integrity, availability and continuity) of the navigation system and they have to be proper accounted into the design and the operation of the system. Those impairments may also impact system performance by affecting ground segment operations such as sensor station measurements or satcom data networks.