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Real-time IGS Network Management and Data Exchange Interfaces

Real-time IGS Network Management and Data Exchange Interfaces. Georg Weber, BKG, Germany IGS Analysis Center Workshop, Miami Beach, Florida, 2-6 June 2008. UDP Relay Broadcast. Relays operated by JPL, NRCan, GA, ESOC, and GFZ since 2003

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Real-time IGS Network Management and Data Exchange Interfaces

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  1. Real-time IGSNetwork Management andData Exchange Interfaces Georg Weber, BKG, Germany IGS Analysis Center Workshop, Miami Beach, Florida, 2-6 June 2008

  2. UDP Relay Broadcast • Relays operated by JPL, NRCan, GA, ESOC, and GFZ since 2003 • Network management, data exchange and software provided by NRCan • System description and status information at www.rtigs.net

  3. NTRIP Broadcast 2003: Permanent operation for EUREF & IGS 2004: RTCM Recommended Standard 2006: Operated at URL www.igs-ip.net 2008: „UDP Relay  NTRIP Interface“ of Pilot Project • 140 streams from 54 providers • 92 IGS, 9 prop. IGS, 29 Miscellaneous, 10 Test • ~40 via UDP from NRCan, ~100 from NTRIP resources • ~1000 registered users, ~40 active every day • Open Source sw for NtripClient, NtripServer, NtripCaster, stream decoding and conversion

  4. Features • Automated online stream user registration • Open data policy • Online stream provider registration • Monitoring: corrupted streams, outages, latencies, meta-data, no post-processing • Alarm system:Notice Advisory to Broadcaster User (NABU) • ROB: http://www.igs.oma.be/real-time/

  5. Distribution

  6. Limits • 200+ streams1000 simultaneously listening clients • Need regional broadcast services • GA Australia & UNSW, EUREF Europe, CORS/PBO U.S.A, SIRGAS South America? • Need thematic (re-)broadcast services for specific communities • Orbit/clocks, ionospher, troposphere

  7. Formats and Transport Protocols • SOC: unlikely to be upgraded to GNSS • RTCMv3: one code per frequency • Adapt (or develop?) other format to include all GNSS observables with app. resolution • CandidatesFormat: RTCM & BINEX,Transport: NTRIP & UDP Relay

  8. Near Real-time Applications • Usually don‘t need access to broadcast service • Interest in 5...15min high-rate RINEX files • Upload of RINEX from stream conversion to GDC • Users should understand specifics of stream formats

  9. Summary of current deficiencies • RTIGS Web representation • User and stream provider registration • Precise coordinates for non IGS stations • „NTRIP Interface  UDP Relay“ • Format & transport protocol for orbits/clocks, observations • Bilateral (protected) stream exchange • More (Re-)Broadcast to share expected workload • Upgrade all IGS stations to real-time, close gaps • End-to-end backup concept • Mind: RTIGS is not only about orbit/clock estimation

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