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Since the first half of 2021, 35 stations of the Permanent National GNSS Network (Résif-Rénag) have been broadcasting their data in real time via a Ntrip server hosted at the Observatoire de la Côte d’Azur (see the list of stations). Most of these stations are equipped with a Trimble NetR9 receiver and a multi-GNSS geodetic antenna that receives signals from GPS, Glonass and Galileo satellites. To access the data stream, the connection is free and subject to identification (login information).

Several open source software (e.g. RTKlib or BNC) can be used to process the data streamed by Ntrip, from format conversion to RTK (Real-Time Kinematic) or PPP (Precise Point Positioning) positioning. Real-time products (correction and ephemeris) are distributed free of charge by the IGS (registration here) and can be used to perform PPP positioning in real time.

The RTK broadcast of the Renag stations will soon integrate the public open-source collaborative network Centipede supported by Inrae and CNRS. The Rénag stream is therefore available to everyone with a receiver capable of receiving RTK corrections (rover), within a radius of about 50 km around the permanent stations (bases).

Contact: renagdc@oca.eu

To know more

Schéma de fonctionnement d’un réseau de bases RTK (Centipède)

Operating diagram of a network of RTK bases (Centipède) © crédit Julien Ancelin – See View Larger Image

Déploiement d’un système de mesure RTK avec une station de base permanente sur trépied et un rover monté sur mât et mobile avec l’opérateur (M.Vidal, OCA)

Deployment of an RTK measurement system with a permanent base station on a tripod and a rover mounted on a mast and mobile with the operator © M.Vidal, OCA