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LST: TUE 17MAR13
076 11:16:53 87P
When the NTS 02-G is synchronized from an IRIG-B source, this field directly indicates the sync source.
(See example for “SLC” source in Figure 4b). Table 1b shows the alternate sync sources supported by the
NTS 02-G.
Satellites in sky
Satellites tracked
GNSS Receiver Mode
LCD INDICATORS Table 1a – GNSS Status
Character Values
Description
Satellites
in the sky
“0 - 9”: 0 - 9
“A - E”: 10-
14
“F”: >14
Represents the total number of satellites currently present in the sky
according to the GNSS almanac. “0” in this position means that NTS 02-G
has lost its knowledge of the GNSS satellites’ orbit geometries. This occurs if
the unit has been in storage for an extended period, or if the GNSS receiver
has been reset. It may take up to two hours for the NTS 02-G to operate
normally again.
Satellites
tracked
“0 - 9”: 0 - 9
“A - E”: 10 –
14
“F”: >14
This digit represents the number of satellites currently being used to
compute the time solution. A “0” value means that no updated time
solution is available, (“out of lock” condition). If this condition persists for
the “Holdover” time the NTS 02-G will indicate “out of sync” as described
under LED Indicators section below.
GNSS
Receiver
Mode
“A”
NTS 02-G in Acquiring mode - attempting to get satellite fixes.
“G”
“Bad geometry”: Satellites are positioned in almost a straight line so best
accuracy cannot be obtained, but the unit will still attempt to synchronize
to UTC.
“S”
Site Survey in progress. NTS 02-G is synchronized and is refining the
position calculation for higher precision. Once complete the mode will
change to Position hold.
“P”
“Position hold”: Position is now known precisely, and the NTS 02-G is
providing its most accurate time, typically within 40 ns of UTC.
Figure 3a - GPS Receiver Status Figure 4b - IRIG-B Source
LST: TUE 17MAR13
076 11:16:53 SLC
