21
GPS solutions are usually computed with respect to
Universal Time Coordinated (UTC) which used to be
called GMT (Greenwich Mean Time). The time is
computed at longitude 0 which passes through
England. California is 8 hours later than UTC (7 hours
during DST).
The other information shown includes the Velocity
(Speed and Direction) and the Position (Latitude and
Longitude) except that altitude is missing.
The rest of the text is concerned with the quality of the
fix itself. The Status reports that the GPS has a 3D
solution which means it is computing a solution in all
three axes which requires at least 4 satellites. In
addition it is showing a HDOP, Horizontal Dilution of
Position and a PDOP (Point DOP).
Dilution of Position is a unitless number that represents
how good the solution is based on the current satellite
positions. For horizontal DOP any number less than
2.0 is very good. PDOP provides a number that
includes both horizontal and vertical accuracy and 3.0
as shown above is a good number for this. This
computation is based strictly on the arrangement of
satellites as shown on the screen. Numbers above 6.0
Summary of Contents for BLUETOOTH GPS
Page 1: ...Bluetooth GPS ...
Page 28: ...28 Part Code WPM01 July 2004 ...
