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Real Time GNSS via Internet Protocol Status & Standardization

Real Time GNSS via Internet Protocol Status & Standardization. Georg Weber , Denise Dettmering, Harald Gebhard Federal Agency for Cartography and Geodesy, BKG, Frankfurt CGSIC 43 rd Arlington, Virginia, March 10-11, 2004. PROVIDER. GPS. Internet. Server PC. Client PC. DGPS. USER.

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Real Time GNSS via Internet Protocol Status & Standardization

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  1. Real Time GNSS via Internet ProtocolStatus & Standardization Georg Weber, Denise Dettmering, Harald Gebhard Federal Agency for Cartography and Geodesy, BKG, Frankfurt CGSIC 43rd Arlington, Virginia, March 10-11, 2004

  2. PROVIDER GPS Internet Server PC Client PC DGPS USER DGPS & Internet - Classic Approach Cellular Phone Network GPRS Modem

  3. PROVIDER GPS NTRIP Server PC NTRIP Client PC GPRS Modem DGPS USER NTRIP: Networked Transport of RTCM via Internet Protocol Broadcaster • No direct communication between User and Provider • Only one Internet Server (Caster) • Caster works as data splitter: mass usage possible • Communication handled through HTTP-Port 80

  4. EUREF-IP Ntrip Broadcaster • Available data streams (02/2004) • 145 real time data streams • 13 networks (EUREF, IGS, CORS,...) • GPS, GLONASS, EGNOS,... • Different formats: • RTCM corrections (DGPS, RTK) • raw measurement data • RTCA • Most streams from Europe • 21 from USA • 1 from Chile • 1 from Australia IP 129.217.182.51 • Capable of handling • Up to 300 real-time data streams • Up to 1500 simultaneous users

  5. Ntrip Real-Time GNSS Network, Status 040305

  6. Network: EUREF 2004-02-25 35 30 25 20 Outages [%] 15 10 5 1.60 0.00 0.49 0.00 0.00 0.00 0.00 0 BUCU0 CAGZ0 GOPE0 HERT0 JOZ20 KRAW0 PENC0 Stream Temporal Availability

  7. 35 28.60 30 25 22.40 20 outages [%] 15 9.00 10 5 1.10 0.40 0.20 0.20 0 BUCU0 CAGZ0 GOPE0 HERT0 JOZ20 KRAW0 PENC0 mountpoint Temporal Availability Network: EUREF January 2004 All data streams: (14 networks) • more than 50% show an availability higher than 95% • 32% of the data streams are available more than 98%

  8. Accuracy RTK Positioning - Internet and GPRS (baseline < 1km) => No significant degradation of performance compared to usage of other transportation media

  9. DGPS data stream (without carrier phase information) Brussels => Ntrip Caster => Frankfurt 100 90 80 70 Internet andmobile phone: 5% of latenciesabove 2 seconds 60 Internet: 95% of latencies < 1 second Frequency [%] 50 40 30 20 Internet 10 Internet + mobile (GPRS) 0 0 0.5 1 1.5 2 2.5 3 3.5 4 Max. latency [sec] Latencies- Korrekturdaten - RTCM corrections

  10. NTRIP Client: „GNSS Internet Radio“ available for Windows, Windows CE, Palm, LINUX

  11. Mobile Data Access GIS & DGPS: Simultaneous Real-Time Accessto DistributedData Compaq iPAQ Pocket PC with „GNSS Internet Radio“ Nokia D211 GPRS modem DGPS: 0.7 cent/min

  12. Other Broadcaster Implementations Broadcasting Network • Regional Broadcasters • Distributing the Workload EUREF: 129.217.182.51:80 BKG: 213.20.169.236:80 IGNE: 80.38.104.84:2101 Terrasat: 62.159.109.248:8080 Thüringen: 195.145.245.203:8040 Hessen: 141.90.2.81:8080 Swisstopo: www3.swisstopo.ch:8080 Trimble DK: Makalu.GPSnet.dk:9000

  13. NTRIP - Standardization • Co-operation with receiver manufacturers • Standardization process within RTCM SC-104 • Working Group on „Internet Protocol“ • Chair: Robert Snow, Thales • WG Members from Leica, Trimble, Ashtech, Topcon, • U.S. Coast Guard • RTCM Paper 167-203/SC104-315 • New RTCM standard hopefully within the next few month

  14. Information on the Web EUREF Ntrip Broadcaster: http://igs.ifag.de/ntrip_caster.htm Ntrip Format: http://igs.ifag.de/index_ntrip.htm Download: http://igs.ifag.de/ntrip_down.htm Conclusion • Streaming GNSSreal-time data over Internet and mobile networks becomes operational • EUREF-IP Ntrip Broadcaster providing data since several month • NtripCaster handles up to 300 streams and up to 1500 simult. users • Today: 150 real-time data streams from 16 countries • Latencies less than 1 second (2 seconds for mobile phone connections) sufficient for most applications like: real-time positioning, navigation, orbit determination • No significant degradation of performance compared to usage of other transportation media

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