Orolia Spectracom VelaSync 1232, User Manual

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Every hourly entry in the log also contains a quality value, represented by “Q= xxxx”
(where x can be any number from 0000 through 3600). The Qualification log records how
many satellites were tracked over a given hour. If for every second of the hour a tracked
satellite was in view, the Quality value will equal 3600. For every second VelaSync tracked
less than the minimum number of satellites, the value will be less than 3600. The minimum
requirement is one satellite at all times after the unit has completed the GNSS survey and
indicates “Stationary”. A minimum of four satellites are required in order for the GNSS sur-
vey to be initially completed.
If all entries in the qualification log are displayed as “0=3600”, a constant GNSS reception
problem exists, so the cause of the reception issue is continuous. If the unit occasionally
shows 0=3600 but at other times shows that 1 through 12 have numbers of other than
“0000”, the reception is intermittent, so the cause of the reception issue is intermittent. If
the Quality value normally equals 3600 but drops to lower than 3600 about every 12
hours, the issue is likely caused by the GNSS antenna having an obstructed view of the sky.
E x a m p l e G P S Q u a l i f i c a t i o n L o g E n t r y :
6 = 151 7 = 1894 8 = 480 9 = 534 10 = 433 12 = 108 Q = 3600
In this example, VelaSync tracked no less that 6 satellites for the entire hour. Out of the
entire hour, it was tracking 6 satellites for a cumulative total of 151 seconds (not necessarily
in a row). For the duration of the hour, it was tracking, 7, 8, 9, 10 and 12 satellites for a
period of time. Because it was tracking at least at least one satellite for the entire hour, this
Quality value is Q=3600.
Note: If VelaSync is not connected to a GNSS antenna, this log will remain
empty.
System Log
Displays log entries related to the Timing System events and daemon events (such as the
Alarms, Monitor, Notification, or SNMP daemons starting or stopping, etc.)
Timing Log
Displays log entries related to Input reference state changes (for example, IRIG input is not
considered valid), antenna cable status. Examples include:
GR
GR = GNSS Reference
1
antenna fault : The GNSS Antenna Problem alarm
indicates the GNSS receiver has detected an over-current or undercurrent
1
GR = GNSS Reference
4.7 Quality Management
CHAPTER
4
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