NavCom SF-3050 Rev.I - Manual (Page 65)

SF-3050 GNSS Product User Guide – Rev I
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
Nav Mode: Various indications of nav mode, for example, StarFire
Dual:RTG; 3D: Dual freq; Non differential: 3D: Dual freq, etc.

Constellation: GPS or GPS/GLONASS

Correction Age: The age of the current aided navigation correction in
seconds. This value changes depending on the correction source and the
correction interval. A few seconds is okay, but many seconds indicate the
fix is degrading over time, and becoming less and less accurate.

Age Limit: The maximum amount of time in seconds the received correction
will be used in case of an outage or drop in the reception of corrections.
The maximum age limit is 100 seconds. The default is 300 seconds for
SBAS (WAAS, EGNOS, MSAS, GAGAN) and RTCM type 1 or 9. The
default is 1200 seconds for RTG (StarFire).
 Error Estimate

Position FOM: The position Figure Of Merit is the estimated uncertainty in
the navigation solution. FOM is the same as the One sigma error estimate.
Refer to the Sapphire Technical Reference Manual (see Related
Documents in the forematter).

Time FOM: 10x TDOP

DOP: Dilution of Precision. A class of measures of the magnitude of error in
GPS position fixes due to the orientation of the GPS satellites with respect
to the GPS receiver. There are several DOPs to measure different
components of the error: GDOP (Position and Time), PDOP (Dimensional
Position), HDOP (Horizontal Position), VDOP (Vertical Position), and TDOP
(Time).
 Antenna Offset: If applicable.
 Solid Earth Tide
: Displays earth’s deformation vector in three dimensions, north, east
and vertical.
 Channel Status
The Channel Status screen provides instantaneous diagnosis of signal quality and
performance for the tracked satellites in three constellations: GPS, GLONASS, and
SBAS.