Global Positioning System Reference
In-Depth Information
least
squarespos.m
apply
corrections
initialize the user
position as the
center of the Earth
create A matrix
(ratio between
ranges and
observations for
each satellite)
compute the
range between
the satellite and
the user
all
satellites
processed?
no
compute the
travel time of
the signal
yes
update
position
estimate
correct the
satellite position
for the Earth's
rotation effect
are all
iterations
complete?
convert the
satellite position
to topocentric
coordinates
no
yes
compute
tropospheric
correction
compute DOP
return
FIGURE A.6. Least-squares position computation flow diagram.
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