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FirstGPS Starter Kit User Guide
19
Using the Starter Kit
2
2.4.5
DOPs
DOPs is the abbreviation for Dilution Of Precision numbers. These
numbers are roughly associated with accuracy: the larger the numbers
are, the less accurate the fix is.
The two most useful numbers are Horizontal DOP (HDOP),
proportional to horizontal position accuracy, and Vertical DOP
(VDOP). Position DOP (PDOP) is for three-dimensional position
accuracy, and Time DOP (TDOP) is used for time accuracy. For more
information, refer to navGetLastFix, page 66, and to the Glossary.
2.4.6
Firmware Info
Firmware Info is the firmware version of the FirstGPS library and the
firmware version of the MPM. For more information, refer to
navGetNavVersion, page 69.
2.4.7
Satellite Data
Satellite Data is the current satellite tracking information for each
IO channel:
• SV – satellite identifier (PRN). If the PRN is against a green
background, that satellite is usable for fixes.
• AMU – the signal strength (in AMUs)
• Az. – azimuth
• Elev. – elevation in degrees, if known. When elevation is
unknown, the value
90
or
–90
is displayed.
For more information, refer to navGetChStatus, page 60 and
navGetSvSelections, page 75.