Meinberg IMS-GNS181, Руководство по установке

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4 GNSS Receiver
GPS Simulation Mode:
This menu allows the user to operate the time server without an antenna. Normally, the NTPD loses synchro-
nization when the antenna or the external reference source is disconnected (red FAIL LED is turned on). By
activating the simulation mode, the corresponding status information for the NTPD is permanently set to SYNC.
This also makes it possible to transmit other times, which have been entered via the menu item "Initialize the
receiver", to the NTPD. In normal cases, the checkbox should remain empty. If this box is activated, the status
"Simulation mode" is displayed under "Info of the receiver" in the main menu.
GPS Time Scale:
UTC
Coordinated Universal Time (including leap seconds which are continuously updated)
GPS since 1st of January 1980 - GPS System Time: monotonous time scale without leap seconds.
Includes the leap seconds from 1970-1980.
TAI since the 1st of January 1970 - International Atomic Time: monotonous time
scale without leap seconds. Difference to GPS Time: 19 seconds.
If you change the timescale in the drop-down menu a warning message will appear in the browser window.
Please Note:
If the GPS receiver is configured to output GPS or TAI timescale instead of UTC, the distributed time via NTP
isn’t based on UTC then. This is a protocol violation and this time server can’t be used to synchronize standard
NTP clients which expect UTC time.
Log Satellite Visibility (GPS Receiver):
If this item is activated, a graphic is generated on which the constellation of the visible satellites are displayed.
SSM Quality Level in GPS Lock Mode:
If the system has E1 / T1 outputs, the quality level of the SSM can be configured here.
SNS Mode - Satellite Navigation System Mode (GNS Receiver):
If you are using a GNS receiver (GNS or GNS-UC with Up Converter), this drop-down menu allows you to
select one or more satellite systems to be used simultaneously.
The following combinations can be selected and received simultaneously:
GNS Receiver GNS-UC Receiver GNM-Receiver
————————————————————————————————————————-
GPS only
GPS only GPS
GLONASS only Galileo only GLONASS
Galileo only GPS/Galileo Galileo
BeiDou only BeiDou
GPS/GLONASS (All available systems can
GPS/Galileo be received simultaneously)
GPS/BeiDou
Galileo/GLONASS
Galileo/BeiDou
GLONASS/BeiDou
GPS/Galileo/GLONASS
GPS/Galileo/BeiDou
IMS-GNS181 Setup Guide Date: 20th March 2020 23