Neo1973 Update!

Ian Stirling OpenMoko at
Sun Jun 17 16:54:56 CEST 2007

Richard Bennett wrote:
> ------- Forwarded message -------
> From: "Richard Bennett" <richard.bennett at>
> To: openmokolist.50.minime at
> Cc:
> Subject: Re: Neo1973 Update!
> Date: Mon, 04 Jun 2007 14:10:46 +0200
> On Mon, 04 Jun 2007 11:31:50 +0200, <openmokolist.50.minime at>
> wrote:
>>> the GPS daemon would need to be updated to allow for kallman filtering
>>> using those accelerometers, so that the GPS apps could continue pointing
>>> the phones location inside tunnels and stuff
>> Unfortunately not. As already pointed out on that list, the
>> accelerometers error would add up itself.
>> Besides: Its only two accelerometers. You can do 2-dimensional
>> 'navigating' with that, no more. No tilting/rotating.
> In the talk posted to google video they say they have 2 x 3D
> accelerometers to allow detecting rotation as well.

With perfect accelerometers, yes.
With real ones, buildable into the phone, no.
The signal you get for roll about the gravity axis is tiny, and quite noisy.

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