[talk-au] new toy found by son

John Smith deltafoxtrot256 at gmail.com
Thu Oct 1 13:03:13 BST 2009


2009/10/1 James Livingston <doctau at mac.com>:
> On 01/10/2009, at 8:53 PM, John Smith wrote:
>> I tried to use it to augment GPS data but the math ended up doing my
>> head in so I'm not sure how much use this would be compared to a 4 or
>> 5Hz GPS logger alone unless someone is super duper at velocity math
>> that is.
>
> It wouldn't be too hard, just double-integrate the acceleration to
> produce a plot of your relative position.
>
> Attaching it to the stand and end points of the GPS trace should
> remove the zeroth order accumulation errors, and then you can start to
> play around with more fancy things using intermediate GPS data to
> adjust for non-linearities in the accelerometer readings. I did pretty
> much this in one dimension for a physics prac a few year ago at uni :)

Here's the link to what I was playing with before, feel free to fill
in the missing blanks, starts about here:

http://forum.xda-developers.com/showthread.php?t=484610&page=12




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