tracking weak signals will be easier.
Mountpoint
Every single NTripSource needs a unique mountpoint on an NTripCaster. Before
transmitting GNSS data to the NTripCaster, the NTripServer sends an assignment
of the mountpoint.
MSAS
MTSAT Satellite-Based Augmentation System. A Satellite-Based Augmentation
System (SBAS) that provides a free-to-air differential correction service for
GNSS. MSAS is the Japanese equivalent of WAAS, which is available in the United
States.
multipath
Interference, similar to ghosts on an analog television screen, that occurs when
GNSS signals arrive at an antenna having traversed different paths. The signal
traversing the longer path yields a larger pseudorange estimate and increases
the error. Multiple paths can arise from reflections off the ground or off
structures near the antenna.
NMEA
National Marine Electronics Association. NMEA 0183 defines the standard for
interfacing marine electronic navigational devices. This standard defines a
number of 'strings' referred to as NMEA strings that contain navigational details
such as positions. Most Trimble GNSS receivers can output positions as NMEA
strings.
NTrip Protocol
Networked Transport of RTCM via Internet Protocol (NTrip) is an application-
level protocol that supports streaming Global Navigation Satellite System (GNSS)
data over the Internet. NTrip is a generic, stateless protocol based on the
Hypertext Transfer Protocol (HTTP). The HTTP objects are extended to GNSS data
streams.
NTripCaster
The NTripCaster is basically an HTTP server supporting a subset of HTTP
request/response messages and adjusted to low-bandwidth streaming data. The
NTripCaster accepts request messages on a single port from either the
NTripServer or the NTripClient. Depending on these messages, the NTripCaster
decides whether there is streaming data to receive or to send.
Trimble NTripCaster integrates the NTripServer and the NTripCaster. This port is
used only to accept requests from NTripClients.
NTripClient
An NTripClient will be accepted by and receive data from an NTripCaster, if the
NTripClient sends the correct request message (TCP/UDP connection to the
specified NTripCaster IP and listening port).
NTripServer
The NTripServer is used to transfer GNSS data of an NTripSource to the
NTripCaster. An NTripServer in its simplest setup is a computer program running
on a PC that sends correction data of an NTripSource (for example, as received
through the serial communication port from a GNSS receiver) to the
NTripCaster.
The NTripServer - NTripCaster communication extends HTTP by additional
message formats and status codes.
SPS985 GNSS Smart Antenna Getting Started Guide 33
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General