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Krzysztof Kajkowski napisał(a):
<blockquote
cite="mid193a0cf50703090124h79bc49ddq6eb3ed2906447c36@mail.gmail.com"
type="cite">2007/3/9, Bartlomiej Zdanowski AutoGuard Ltd.
<a class="moz-txt-link-rfc2396E" href="mailto:b.zdanowski@autoguard.pl"><b.zdanowski@autoguard.pl></a>:
<br>
<br>
<blockquote type="cite"> I asked my colleagues who are GPS devices
specialists and they said that
<br>
this is all wrong.
<br>
</blockquote>
<br>
Did they talked about AGPS
(<a class="moz-txt-link-freetext" href="http://wiki.openmoko.org/wiki/Hardware:AGPS">http://wiki.openmoko.org/wiki/Hardware:AGPS</a>)?
<br>
</blockquote>
They did about technology itself not about marketing terms (as Wiki
says):<br>
> AGPS is purely a marketing term.<br>
Hot start has nothing to do with it. GPS is still very inaccurate. It's
very powerful if you focus on task that Object (human, car, plane etc.)
that carries GPS receiver does. <br>
Lets assume that an Object is a car and you have accurate GPS maps. Car
equipped with GPS receiver drives only through road and not surrounding
buildings and side-walks that's sure. So now even if reading does not
point somewhere on the road software can compute new position
(depending on car's speed and direction) to correct red GPS position to
put car on the road. Understand this?<br>
If person should walk on side-walk, with current area map you can
correct GPS inaccurate reading to compute new position on side-walk
instead somewhere near on road, in build or in surrounding bushes.<br>
<br>
I work for company that develops devices for car and person tracking.
We do the stuff as written above to correct GPS readings.<br>
A car that is parked in front of our office equipped in GPS receiver
collects data about it position. Even if is parked in the same place
for all day, with a clear sky above (a many satellites visible), raw
GPS <br>
readings show that it hangs around all day in range of a few tens of
meters and sometimes a hundred of meters. And I can assure the we use
good GPS receivers.<br>
<br>
The problem is very complicated.<br>
<br>
<div class="moz-signature">-- <br>
<b>Bartłomiej Zdanowski</b><br>
Programista<br>
Dział Rozwoju Produktów<br>
AutoGuard & Insurance Sp. z o.o.<br>
<br>
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