[OSM-talk] Motion sensors for navigation

[Erik Lundin]

Talking about tunnel tracking...

I have thought of a solution were you have a GPS device together with an 
electronic compass sensor. In the tunnel, the position is calculated by 
knowing the last position, the speed (either from the speedometer in a 
car or keeping the same speed as before the tunnel) and the compass 
direction. Since the error in this case increases exponentially with 
time (right?), it would help to drive through the tunnel in both directions.

/Erik

David Earl skrev:
> On 23/03/2010 12:21, John Smith wrote:
>> On 23 March 2010 21:56, David Earl<david at frankieandshadow.com>  wrote:
>>> I wonder whether they might be interested in offering us some units for
>>> testing?
>> Using inertial navigation the accuracy deteriorates considerably over time.
>>
>> http://en.wikipedia.org/wiki/Inertial_navigation
> 
> Yes, obviously. The problems we have are exactly the ones they are 
> trying to solve though - urban canyons and tunnels - where we lose the 
> GPS accuracy for a short while. I don't think they're suggesting they 
> are a substitute for GPS, just to augment it where GPS can't reach. If 
> they are looking at military applications, the accuracy has to be an 
> order of magnitude better than we would need as is their GPS.
> 
> David
> 
> 
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