Safran VersaSync User Manual page 298

4.6 Quality Management
Every hour (displayed in the log as UTC time), VersaSync counts the total num-
ber of satellites that were tracked during that hour. The GNSS qualification log
shows the number of satellites that were tracked followed by the number of
seconds that the particular number of satellites were tracked during the hour
(3600 seconds indicates a full hour). The number to the left of the "=" sign indic-
ates the number of satellites tracked and the number to the right of the "=" sign
indicates the number of seconds (out of a total of 3600 seconds in an hour) that
the unit was tracking that number of satellites. For example, "0=3600" indicates
the unit was tracking 0 satellites for the entire hour, while "0=2700 1=900" indic-
ates the unit was tracking one satellite for 900 seconds, but for the remaining por-
tion of the hour it was tracking zero satellites.
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 VersaSync tracked less than the minimum number of
satellites, the value will be less than 3600. The minimum requirement is one satel-
lite at all times after the unit has completed the GNSS survey and indicates "Sta-
tionary". A minimum of four satellites are required in order for the GNSS survey 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, VersaSync 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.
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Note: If VersaSync is not connected to a GNSS antenna, this log will
remain empty.
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4 VersaSync User Manual Rev. 12