M e r i d i a n I I U s e r M a n u a l
26
C H A P T E R T H R E E
27
M e r i d i a n I I 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
Local Oscillator Synthesizer Tuning------------> OK
Local Oscillator Synthesizer-------------------> OK
GPS Reference Time-----------------------------> OK
GPS Receiver Oscillator------------------------> OK
GPS Antenna Short------------------------------> OK
GPS Antenna Open-------------------------------> *FAULT*
GPS Receiver Oscillator PLL--------------------> OK
get_sw_opts
See
Appendix I - Software Options
for information on this command.
gpsdynmode
This command displays the current GPS Subsystem dynamic mode of operation. It has two possible
settings: OFF or ON. When it is OFF, it is assumed that Meridian II is installed in a stationary loca-
tion. When it is ON, it is assumed that Meridian II is installed on a moving platform. Dynamic mode
is intended for shipboard applications only.
When the dynamic mode is OFF, Meridian II 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. Dynamic mode is intended for shipboard applica-
tions only.
Command:
gpsdynmode
MeridianII reply:
OFF
gpsionoinfo
This command provides the current and previously received GPS ionospheric model coefficients.
Also shown are the week number and time-of-week of the almanac transmissions that contained the
two sets of model coefficients.
Command:
gpsionoinfo
MeridianII reply:
GPS Ionosphere Model Almanac Parameters:
WN_a = 1890 T_oa = 503808
Alpha0 = +1.676e-08 Alpha1 = +7.451e-09 Alpha2 = -1.192e-07 Alpha3 = -5.960e-08
Beta0 = +1.106e+05 Beta1 = +1.638e+04 Beta2 = -2.621e+05 Beta3 = -6.554e+04
WN_a = 1890 T_oa = 405504
Alpha0 = +1.676e-08 Alpha1 = +7.451e-09 Alpha2 = -1.192e-07 Alpha3 = -5.960e-08
Beta0 = +1.106e+05 Beta1 = +1.638e+04 Beta2 = -2.621e+05 Beta3 = -6.554e+04
Summary of Contents for Meridian II
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