HR: 1330h
AN: G52A-0039    [PDF]
TI: NTRIP: Networked Transport of RTCM via Internet Protocol - Internet Radio Technology for Real-Time GNSS Purposes
AU: * Gebhard, H
EM: harald.gebhard@uni-dortmund.de
AF: Communication Technology Institute, Universit„t Dortmund, Otto-Hahn-Straáe 4, Dortmund, 44221 Germany
AU: Weber, G
EM: georg.weber@bkg.bund.de
AF: Federal Agency for Cartography and Geodesy, Richard-Strauss-Allee 11, Frankfurt, 60598 Germany
AB: The massive worldwide growing of Internet capacity enables the introduction of new services such as Internet Radio or Internet Video-on-Demand, which transfer continuous data-streams by IP-packages. These services include the data transport via mobile IP-Networks like GSM, GPRS, EDGE, and UMTS where costs are nowadays rapidly decreasing. As a consequence, the global Internet can be used for the real-time collection and exchange of GNSS data, as well as for broadcasting derived differential products. Compared to Multimedia applications, the bandwidth required for streaming GNSS data is relatively small. The introduction of a real time streaming of GNSS data via Internet as a professional service is demanding with respect to network transparency, network security, program stability, access control, remote administration, scalability and client simplicity. This paper will discuss several possible technical/protocol solutions for streaming GNSS date over the Internet: Unicast vs. IP-Multicast, TCP vs. UDP, Client/Server vs. Client/Server/Splitter architecture. Based on this discussion, a novel HTTP-based technique for streaming GNSS data to mobile clients over the Internet is introduced. It allows simultaneous access of a large number of PDAs, Laptops, or GNSS receivers to a broadcasting host via Mobile IP-Networks. The technique establishes a format called "Networked Transport of RTCM via Internet Protocol" (NTRIP). NTRIP is designed for disseminating differential correction data (e.g. in the RTCM-104 format) or other kinds of GNSS streaming data.
DE: 1242 Seismic deformations (7205)
DE: 1294 Instruments and techniques
DE: 7294 Instruments and techniques
SC: Geodesy [G]
MN: 2003 Fall Meeting