EndRun Tempus LX GPS, User Manual

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T e m p u s L X G P S U s e r M a n u a l 46
C H A P T E R S I X
47 T e m p u s L X G P S U s e r M a n u a l
C O N T R O L A N D S T A T U S C O M M A N D S
Set:
gntptimemodeconfig
Tempus LX response: Interactive shell script is started.
gntpversion
This command displays the firmware version and build date of the Tempus LX.
Query:
gntpversion
Tempus LX response:
Tempus LX GPS 6010-0042-000 v 1.00 Wed Jan 16 22:38:21 UTC 2004
gpsdynmode
This command displays the current GPS subsystem dynamic mode of operation. It has two possible
settings: ON or OFF. When it is ON, it is assumed that the Tempus LX is installed on a moving plat-
form. When it is OFF, it is assumed that the Tempus LX is installed in a stationary location.
When the dynamic mode is OFF, the Tempus LX will use its accurate reference position to implement
Timing Receiver Autonomous Integrity Monitoring (TRAIM) for the utmost in reliability during any
GPS system faults. In addition, single satellite operation is possible once an initial accurate position
has been determined.
When the dynamic mode is ON, only a very minimal TRAIM algorithm is in effect because the ac-
curate reference position is not static. In addition, a minimum of four satellites must be visible and
only 3-D position fixes are used. When the dynamic mode is ON, the source reported for the accurate
reference position by
gpsrefpos
is set to DYN.
Query:
gpsdynmode
Tempus LX response:
OFF
gpsrefpos
This command displays the current GPS subsystem reference position. The source of the position,
which is one of UNK (unknown), DYN (dynamic), USR (user entered) or AVG (24 hour average of
GPS fixes) is displayed first. The WGS-84 latitude and longitude in degrees, minutes, seconds format
and the height above the WGS-84 reference ellipsoid in meters follow. Refer to
Appendix D - GPS
Reference Position for details.
Query:
gpsrefpos
Tempus LX response:
CURRENT REFERENCE POSITION = AVG N38d26m36.11s W122d42m56.50s +00032.5 meters
gpsstat
This command allows the user to query the status of the GPS timing subsystem. During normal op-
eration, the NTP daemon polls the GPS timing subsystem every 16 seconds. The results of this poll
are used to steer the system clock and are saved to a log file. This command parses and formats the
data contained therein and prints this fixed-length string having these fields:
LKSTAT TFOM = ? YEAR DOY HH:MM:SS.sssssssss LS LF S N VCDAC SN.R FLTS
Where:
LKSTAT is the tracking status of the engine, either LOCKED or NOTLKD.