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C H A P T E R T H R E E
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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
LKSTAT TFOM = ? YEAR DOY HH:MM:SS LS LF S NN AGC EFCDAC C/No FLTR FLTS
Where:
LKSTAT is the tracking status of the GPS Subsystem, either LOCKED or NOTLKD.
TFOM = ? is a value between 3 and 9 and indicates clock accuracy.
A detailed explanation of TFOM is in
Appendix A - TFOM
.
YEAR
is the year of the UTC timestamp of the most recent update.
DOY
is the day-of-year of the UTC timestamp of the most recent update.
HH:MM:SS is the hour, minute and second of the UTC timestamp of the most recent update.
LS
is the current number of leap seconds difference between the UTC and GPS timescales
(18 at the time of this writing).
LF
is the future (at the next UTC midnight) number of leap seconds difference between the
UTC and GPS timescales (18 at the time of this writing).
S
is the Signal Processor State, one of 0 (Acquiring), 1 (GPS Locking), 2 (GPS Locked), 9
(Warming Up).
NN
is the number of GPS satellites being tracked, 0 to 12.
AGC
is the RF front-end Automatic Gain Control 8-bit DAC value. Typical range is 125 to
200, with larger numbers implying higher gain being used.
EFCDAC is the system oscillator Electronic Frequency Control 20-bit DAC value, 0 to 1048575
with larger numbers implying higher oscillator frequency. Typical range is 320000 to
680000.
C/No
is the received GPS Carrier Signal-to-Noise Ratio, 0.00 to 99.9, measured in dB in a 1Hz
bandwidth. Typical range is 39 to 50.
FLTR
is the fault status for the GPS Receiver. This is a numeric value consisting of
four hexadecimal characters where each bit indicates a particular receiver fault.
Assertion of any of these bits will light the Alarm LED. Bit definitions are shown below,
Decoding the bits can be difficult for non-programmers. For a more user-friendly method
of reading the fault status use the
faultstat
command. For details on each system
fault see
Appendix G - System Faults
.
Summary of Contents for Meridian II
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