Realtime IGS Network Management and Data Exchange Interfaces

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Real-time IGSNetwork Management andData
Exchange Interfaces

• Georg Weber, BKG, Germany
• IGS Analysis Center Workshop, Miami Beach,
  Florida, 2-6 June 2008

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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

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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

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Features

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

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Distribution
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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

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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

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Near Real-time Applications

• Usually dont 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

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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