M e r i d i a n I I U s e r M a n u a l
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C H A P T E R F O U R
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M e r i d i a n I I U s e r M a n u a l
H T T P S I N T E R F A C E
WGS-84 Last Position Fix
Latitude,
These fields show information for the most recent position fix. The WGS-84
Longitude,
latitude and longitude in degrees, minutes, seconds format and the height above
Height
the WGS-84 reference ellipsoid in meters is shown. Refer to
Appendix D -
Installing the GPS Antenna, About WGS-84
.
PDOP, HDOP,
DOP stands for Dilution-of-Precision.
VDOP, TDOP
Out-of-Range
The out-of-range counter may be non-zero when Meridian II has been moved
Count
more than 1 km from its previous location without being placed in UNKNOWN
mode. (See the
setgpsrefpos
command.)
GPS-UTC Almanac Info
These fields show the IS-GPS-200 almanac parameters which are used to relate GPS time to UTC.
LS, LSF
These fields contain the current leap second and future leap second values.
WNLSF, DN
These fields show the GPS week number and day number of week at the end of
which the future leap second will take effect. This could be in the past if a leap
second insertion has recently taken place. Leap second events occur every few
years on either June 30 or December 31.
A0, A1,
These fields show the parameters for calculating the small residual offset
WNt, tot
between the GPS master clock ensemble and UTC(USNO). This is typically
less than 10 nanoseconds.
Current
This is the current value of the GPS-UTC offset, which includes leap seconds
(GPS-UTC)
plus the small residual offset explained above. Time and date of most recently
received satellite transmission containing this data is also shown.
GPS Ionosphere Almanac Info
The information shown here is the broadcast GPS almanac parameters for the Klobuchar ionospheric
delay model. Two sets of model parameters are shown. The first (alpha) is the most recently received
set. The second (beta) is the previously received set. The GPS week number and time of week are
also shown.
Real-Time Ionospheric Corrections (Optional)
This section is for the optional RTIC. If your Meridian II does not have RTIC, then this section will
not be shown. For more information on RTIC see
Chapter 11 - Real-Time Ionospheric Corrections
.
Configuration
Clock Calibration Clock calibration is used to advance or retard the clock in order to correct for
GPS Receiver delay and any propagation delay due to GPS antenna cable.
It may also be used to compensate for the inherent time offsets that may exist
with external hardware such as distribution amplifiers, etc. Calibration range is
±500,000 nanoseconds.
Summary of Contents for Meridian II
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