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Real-time IGS Network Management and Data Exchange Interfaces

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11 diapositives · 259 Views · Sep 15, 2014

This document provides an overview of the Real-time IGS Network Management and Data Exchange interfaces discussed at the workshop held in Miami Beach, Florida, from June 2-6, 2008. It covers the implementation of UDP Relay Broadcast systems operated by various agencies since 2003, the status of network management and data exchange tools, and facilities provided by NRCan. Key features include stream registration, monitoring, and corruption alerts to enhance real-time data access for over 1,000 registered users.

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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