GPS - Re: Enhanced Positioning Technology in the TomTom GO 920 T

Author

Re: Enhanced Positioning Technology in the TomTom GO 920 T

Darius

2007-12-23, 10:33 pm

On Dec 1, 11:40 pm, Nospam <nos...@nospam.demon.co.uk> wrote:
> Hi,
>
> Is the Enhanced Positioning Technology in the TT920 likely to be any
> good?
>
> Will it work or is it just a waste of money?
>
> Thanks for any thoughts
>
> --
> Nospam

I am still looking for answer to the same question.
Looking for indoor gps-off tests.
technology comes from missile control applications.

Darius

Darius

2007-12-23, 10:33 pm

On Dec 24, 3:03 am, Darius <dariusjack2...@yahoo.ie> wrote:
> On Dec 1, 11:40 pm, Nospam <nos...@nospam.demon.co.uk> wrote:
>
>
>
>
>
>
> I am still looking for answer to the same question.
> Looking for indoor gps-off tests.
> technology comes from missile control applications.
>
> Darius

EPT video from
http://www.tomtom.com/products/prod...ategory=0&Lid=4
shows nothing specific.

Ralphinator

2007-12-24, 4:33 am

"Darius" < dariusjack2006@yahoo
.ie> wrote in message
news:8dbf3bfb-b1dc-4392-8c92- 27800b88cc6d@a35g200
0prf.googlegroups.com...
> On Dec 24, 3:03 am, Darius <dariusjack2...@yahoo.ie> wrote:
>
> EPT video from
> http://www.tomtom.com/products/prod...ategory=0&Lid=4
> shows nothing specific.
>

I'm guessing it has a gyro in it, that can sense turns and such. I know
that's how the system (in an easy way) works in some of our military
vehicles when the GPS is lost. Obviously, I can't go into too much detail on
the workings.

--
Posted via a free Usenet account from http://www.teranews.com

Darius

2007-12-24, 7:33 am

On Dec 24, 8:33 am, "Ralphinator" <im...@home.com> wrote:
> "Darius" <dariusjack2...@yahoo.ie> wrote in message
>
> news:8dbf3bfb-b1dc-4392-8c92- 27800b88cc6d@a35g200
0prf.googlegroups.com...
>
>
>
>
>
>
>
>
>
>
>
>
> I'm guessing it has a gyro in it, that can sense turns and such. I know
> that's how the system (in an easy way) works in some of our military
> vehicles when the GPS is lost. Obviously, I can't go into too much detail on
> the workings.
>
> --
> Posted via a free Usenet account fromhttp://www.teranews.com

Thanks.
What TomTom says about EPT is
"
Enhanced Positioning Technology uses movement and gravity sensors to
calculate users (drivers) position,
"
So accelerometers are gravity sensors and gyros are movements (turns)
sensors.

Capacitive gravity sensorSony NW-S200 walkman - Sport function
The Walkman NW-S200 features in-built product intelligence to support
its sports counter functions. Via an integral gravity sensor

Document Type and Number:
United States Patent 4644662
Link to this page:
http://www.freepatentsonline.com/4644662.html
Abstract:
An inclinometer includes two coplanar electrodes positioned within a
chamber of a metallic housing containing a high relative dielectric
constant fluid and a gas. With the inclinometer positioned on a level
surface equal areas of the two electrodes are immersed in the
dielectric fluid creating two equal capacitors formed by the
electrodes and the metallic housing. When the inclinometer is rotated
through an inclination angle, unequal areas of the electrodes are
immersed in the fluid causing a capacitance differential that is a
measure of the inclination angle.

G Sensor
http://www.hondata.com/manuals/gsensor/gsensor.html

There must be cheap one-chip inbuilt sensor.

I am still interested how it works in indoor navigation.

Darius

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