ESA's European Radio Navigation Laboratory, part of the Agency's Radio Frequency Systems, Payload and Technology Laboratory based at ESA's ESTEC technical centre in Noordwijk, the Netherlands, is supporting the introduction of Galileo and its services. Its resources include Galileo/GPS/GLONASS signal simulators and receivers, a Time and Geodesy Verification Facility, a formation-flying test-bed and a full-scale PRS Laboratory, suitable for evaluating the single most precise and secure type of Galileo signal, the Public Regulated Service (PRS).