EndRun RTM3204, User Manual

Page: 30 / 66

R T M 3 2 0 4 G P S T i m i n g M o d u l e U s e r M a n u a l 20
C H A P T E R T H R E E
21 R T M 3 2 0 4 G P S T i m i n g M o d u l e 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:
cpuoptsconfig
RTM3204/Tycho response: Interactive shell script is started.
eraserootfs_1
This command erases the UPGRADE root file system FLASH partition in preparation for performing
a Linux subsystem firmware upgrade. See Appendix B - Upgrading the Firmwar e for more informa-
tion.
Set:
eraserootfs_1
RTM3204/Tycho response: Erase progress as percent is shown.
gpscaldelay
This command displays the current calibration delay setting. The allowable calibration delay range is
+500000 to -500000 nanoseconds.
Query:
gpscaldelay
RTM3204/Tycho resposne:
+0 nanoseconds
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 RTM3204 is installed on a moving plat-
form. When it is OFF, it is assumed that the RTM3204 is installed in a stationary location.
When the dynamic mode is OFF, the RTM3204 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
RTM3204/Tycho 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.
Query:
gpsrefpos
RTM3204/Tycho 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
operation, a Linux daemon (SYSTIMED) polls the GPS timing subsystem every 16 seconds. The