EUREFIP Streaming GNSS data over the Internet using

EUREF-IP Streaming GNSS data over the Internet using NTRIP 1. 0 Denise Dettmering Federal Agency for Cartography and Geodesy (BKG) Frankfurt, Germany CGSIC 45 th Prague, Czech Republic, March 14 -15, 2005

Content EUREF-IP Pilot Project Ntrip 1. 0 Ntrip data streams EUREF-IP Ntrip Broadcaster Ntrip DGPS Professional Service Concept

EUREF-IP Pilot Project • real-time GNSS infrastructure on the Internet • selected EPN stations • disseminate RTCM corrections for differential positioning and navigation purposes • various other applications, like real-time orbit determination and atmospheric parameter estimation • Pilot Project: EUREF-IP

NTRIP 1. 0 Networked Transport of RTCM via Internet Protocol Developed by RTCM SC-104 Radio Technical Commission for Maritime Services Special Committee on Differential Global Navigation Satellite Systems • RTCM recommended standard • for streaming GNSS data over the Internet • transmission via TCP/IP • based on HTTP communication • HTTP port 80 for all communications (supported by most firewalls) • different data formats (RTCM/Raw measurement/. . . ) • Internet Radio Technology

NTRIP system components Server Caster Client 50. . . 100 x max 5 kbit/s 1000. . . x max 5 kbit/s • no direct communication between provider and user • only one „real“ Internet Server (Caster) • Caster works as data splitter: mass-usage possible

Ntrip data streams 03/Mar/2005: 654 real-time data streams, from: 30 countries 27 Ntrip. Caster

Ntrip Broadcaster - Europe

EUREF-IP Ntrip Broadcaster www. euref-ip. net: 80 134 data streams 16 networks EPN: 14 stations

EUREF-IP stations

EUREF-IP station GOPE

Ntrip DGPS Professional Service Concept Administration Raw Data RTCM Corrections Backup Ntrip. Tracker System Operator DSL DSL Mobile. PIIP Mobile IP Reference Receiver Rover Receiver Ntrip. Server Ntrip. Client DSL DSL Mobile. PIIP Mobile IP EGNOS Receiver Ntrip. Server DSL Internet Primary Ntrip. Monitor Backup Ntrip. Monitor Primary Ntrip. Caster Backup Ntrip. Caster Network DGPS VRS EGNOS DGPS VRS

Ntrip DGPS Professional Service Concept Administration Raw Data RTCM Corrections Ntrip. Tracker System Operator DSL DSL Mobile. PIIP Mobile IP Reference Receiver Rover Receiver Ntrip. Server Ntrip. Client DSL DSL Mobile. PIIP Mobile IP EGNOS Receiver Ntrip. Server DSL Internet Primary Ntrip. Monitor Backup Ntrip. Monitor Primary Ntrip. Caster Backup Ntrip. Caster Network DGPS VRS EGNOS DGPS VRS

Summary Streaming GNSS data over Internet and cellular phone networks has proofed working No significant degradation of performance compared to usage of other transportation media Ntrip may disseminate all data streams with bitrates between 50 and 500 bytes/sec (different data formats) RTCM committee has accepted Ntrip as standard for packet based communication Multiple services already established, e. g. EUREF-IP Various Ntrip clients and Ntrip servers are available

Information http: //igs. ifag. de/index_ntrip. htm euref-ip@bkg. bund. de