Proxim RangeLAN2 7920 Manual de usuario Pagina 47

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complete a sample of the actual heading was also a factor since the compass was only
providing output data at a rate of one string per second and testing showed that there was
an indeterminate yet not insignificant compass delay while the output signal caught up
with the actual heading.
b. Where am I?
In the navread function the robots desired and actual locations are
compared and a desired heading is determined. The GPS inputs are converted to a grid
location by a simple multiplication of the degrees and minutes by a constant to determine
the distance north of the equator and by a constant and a scaling factor to determine the
distance west of the prime meridian. Once the desired and actual locations are known
trigonometry and Pythagoreans theorem are employed to determine the desired heading
to steer and the distance to the desired location. The data is then fed back to the
navigation costate which occasionally re-queries the navread function for an update on
new headings and distance.
Figure 18. Distance and Course to Steer Calculations
Prime
meridian
Equator
Distance
θ
Latitude
Difference
Longitude
Difference
Desired
Location
Actual
Location
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