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Appendix C
C.1
Ntrip
Ntrip Caster
Ntrip Client
Ntrip Server
Glossary
Glossary
NTRIP
Networked Transport of RTCM via Internet Protocol
is a protocol streaming real-time corrections over the Internet.
•
is a generic protocol based on the Hypertext Transfer Protocol HTTP/1.1.
•
is used to send differential correction data or other kinds of stream-
•
ing data to stationary or mobile users over the Internet. This process
allows simultaneous computer, laptop, PDA, or instrument connections to
a broadcasting host.
supports wireless Internet access through mobile IP networks like digital
•
cellular phones or modems.
The Ntrip Server could be the GPS instrument itself. This setup means the GPS
instrument is both the Ntrip Source generating the real-time data and also the
NTRIP Server transferring this data to the Ntrip Caster.
NTRiPClient
NTRiPServer
GS_044
The Ntrip Caster
is an Internet server handling various data streams to and from the Ntrip
•
Servers and Ntrip Clients.
checks the requests from Ntrip Clients and Ntrip Servers to see if they are
•
registered to receive or provide real-time corrections.
decides whether there is streaming data to be sent or to be received.
•
The Ntrip Client receives data streams. This setup could be, for example a
real-time rover receiving real-time corrections.
In order to receive real-time corrections, the Ntrip Client must first send
a user ID
•
a password
•
an identification name, the so-called Mountpoint, from which real-time
•
corrections are to be received
to the Ntrip Caster.
The Ntrip Server transfers data streams.
In order to send real-time corrections, the Ntrip Server must first send
a password
•
an identification name, the so-called Mountpoint, where the real-time cor-
•
rections come from
to the Ntrip Caster.
Ntrip and its
role in the
Internet
81
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