[talk-au] new toy found by son

Liz edodd at billiau.net
Thu Oct 1 12:38:50 BST 2009


On Thu, 1 Oct 2009, James Livingston wrote:
> 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 :)
>
adrian is somewhat disappointed, as this toy would have provided the 
accelerometers needed for his uni project, but it is only now available, with 
the due date being "soon".
he did have access to accelerometers in the freerunner but they didn't 
actually provide what he needed (and he borked his freerunner)

he was hoping that gps+accelerometers+gyros would provide accurate cheap 
mapping of mtb trails





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