as I understand it, you can get more value out of the accellerometer than that<br><br>in the simplest case, we know a gps can be off by a certain percent. say you leave the phone still for a long time, you could average the error and get more precise over time (yeah, there'll be some skew... but we can trust the law of averages to help us out some)
<br><br>now, say you were aware of the motion of the device, you could still account for that motion in the averaging process (A-meter says I've gone 2 feet, gps says I've gone 3... pretty safe to say I'm between those)
<br><br>one of the real weaknesses of the accellerometer(INS) are long-term integration errors, and the biggest weakness of gps is short term precision... put the two together and they complement each other REALLY well. our (US) military has been using this combination for years with really great(horrible?) results... it'd be great to put this to a peaceful use as well
<br>-- <br>Jeff<br>O|||||||O<br><br><div><span class="gmail_quote">On 1/25/07, <b class="gmail_sendername">Marcus Bauer</b> <<a href="mailto:marcus.bauer@gmail.com">marcus.bauer@gmail.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
On Thu, 2007-01-25 at 20:00 +0100, Ortwin Regel wrote:<br>> The only situation where I can see the<br>> accelerometer being really useful is where Apple is using it: For<br>> changing the screen orientation of things according to how you hold
<br>> the phone.<br><br>An accelerometer is a nice to have for navigation too. When losing the<br>GPS signal, i.e. in a tunnel, you can go on doing dead reckoning.<br><br>And it helps to get the vector map data coordinated with the GPS
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