Network of GNSS Permanent Stations of Spain (ERGNSS)

The ERGNSS is composed of more than 120 permanent GPS/GNSS stations distributed throughout the national territory (see stations). Many of them are integrated in the European EUREF network and some in the worldwide IGS (International GNSS Service) network as specified below. The coordinates of these stations are calculated using precision scientific software (ERGNSS station coordinates). In addition, in order to manage expenditure more efficiently and with a view to having an adequate density of stations throughout the national territory, the NGI shares ownership of some ERGNSS stations with other institutions, such as Autonomous Communities and State Ports, by means of collaboration agreements. The stations are equipped with multi-frequency geodetic receivers, with the capacity to receive other constellations, such as GLONASS or GALILEO and geodetic antennas, almost all of them "Choke ring" type and with calibration of the variation of the phase centre (some of them with individual calibrations).