Letter symbol GNSS Constellation
G GPS
R GLONASS
E Galileo
J QZSS
C BeiDou
I IRNSS
The number next to the letter indicates the satellite number. The number below indicates
the signal strength (C/N
o
).
3.3.3.11 A-GPS
A-GPS stands for Assisted GPS. This widely used technology involves providing additional
data to the GNSS receiver by an alternative means of communication (e.g., via IP, or by
manual data entry), thereby reducing the time for the receiver to acquire and track the actual
satellite signals. This may lead to a significantly shorter time for NetClock to deliver a GNSS-
based timing signal upon a “cold start” of the unit.
A-GPS client
The A-GPS client is used to send assistance data to the GPS receiver. This is most useful in areas
with poor GPS reception.
The A-GPS client functionality is only available with the following GNSS receiver models:
Res-SMT GG
u-blox M8T
A-GNSS server
An A-GNSS server allows a NetClock unit to operate as a server, thus providing A-GNSS eph
emeris and almanac data to other client devices e.g., a Spectracom GSG-series GNSS sim
ulator.
The A-GNSS functionality largely depends on the GNSSreceiver model installed in your unit:
Res-SMT GG: Produces server files only for GPS
u-blox M8T: Produces server files for GPS, BeiDou, Galileo Rinex3 and Almanac
3.3 Managing Input References
CHAPTER 3 • NetClock User Reference Guide Rev. 16
205
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