[HH] cheap navigation unit

[Drew Van Zandt]

Prius built-in nav system has internal INU with accelerometer, not just
GPS.  Also, Prius native tech _does_ have access to speedometer info.  You
can get the same data with some external toys of your own.

*
Drew Van Zandt
Artisan's Asylum Craft Lead, Electronics & Robotics
Cam # US2010035593 (M:Liam Hopkins R: Bastian Rotgeld)
Domain Coordinator, MA-003-D.  Masquerade aVST
*



On Thu, Feb 23, 2012 at 6:11 PM, Tom Metro <tmetro+hhacking at gmail.com>wrote:

> Kurt L Keville wrote:
> > ...how the Prius seemed to know where you were going after we entered
> > the Ted Williams tunnel. I assume it had a pretty good INU built-in...
>
> Inertial Navigation Unit?
>
> So you are saying it kept you on the virtual road despite having lost
> the GPS signal?
>
>
> > ...and had access to the speedometer...
>
> Any evidence to suggest it didn't just average the speed observed in the
> moments before entering the tunnel and extrapolate from that?
>
> The interesting test would be to drive into the tunnel and stop and see
> if your virtual position keeps moving.
>
> In all probability the GPS system is completely isolated from the car's
> main computer that has access to the speedometer data, but that's just
> speculation.
>
>
> > is there a free Skyhook-like system model?
>
> Yes, supposedly Google has one. It may only be free for Android apps.
>
>
> > ... I was looking at projects like
> > http://rvsn.csail.mit.edu/location/
>
> That talks about using Wi-Fi triangulation for indoor navigation.
>
> This is the same stuff they're doing the the latest Google Maps app,
> right? Where you can navigate inside malls and stores.
>
>  -Tom
>
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