PowerPoint-Pr

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EUREF-IP Streaming GNSS data over the
Internet using NTRIP 1.0
Denise Dettmering Federal Agency for
Cartography and Geodesy (BKG)Frankfurt,
GermanyCGSIC 45th Prague, Czech Republic, March
14-15, 2005
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Content

• EUREF-IP Pilot Project
• Ntrip 1.0
• Ntrip data streams
• EUREF-IP Ntrip Broadcaster
• Ntrip DGPS Professional Service Concept

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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

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NTRIP 1.0

• Networked Transport of RTCM via Internet Protocol
• 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

Developed by RTCM SC-104 Radio Technical
Commission for Maritime Services Special
Committee on Differential Global Navigation
Satellite Systems
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NTRIP system components
Server
Client

• no direct communication between provider and user

• only one real Internet Server (Caster)

• Caster works as data splitter mass-usage
  possible

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Ntrip data streams
03/Mar/2005 654 real-time data streams,
from 27 NtripCaster 30
countries
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Ntrip Broadcaster - Europe
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EUREF-IP Ntrip Broadcaster
134 data streams 16 networks EPN 14 stations
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EUREF-IP stations
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EUREF-IP station GOPE
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Ntrip DGPS Professional Service Concept
Reference Receiver
Rover Receiver
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Ntrip DGPS Professional Service Concept
Administration
Raw Data
RTCM Corrections
Reference Receiver
Rover Receiver
Reference Receiver
Rover Receiver
Reference Receiver
Rover Receiver
NtripClient
NtripServer
NtripTracker
NtripTracker
NtripServer
NtripClient
NtripTracker
NtripClient
NtripServer
NtripServer
System Operator
System Operator
System Operator
DSL
Mobile IP
Mobile IP
DSL
Mobile PI
DSL
DSL
Mobile PI
Mobile IP
Mobile IP
DSL
DSL
DSL
Internet
Primary NtripCaster
Backup NtripMonitor
Network DGPS VRS
Primary NtripMonitor
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NtripMonitor
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NtripMonitor Stream Details
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NtripMonitor Last Failures
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NtripMonitor -NABU
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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

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Information
http//igs.ifag.de/index_ntrip.htm euref-ip_at_bkg.bu
nd.de