[time-nuts] GPS from a window seat

[Robert Atkinson]

Well Jim brought up cars, 
I did look at using a GPS as a speed sensor for a car some time ago. The 1000kPH limit (and 1s update rate) stopped that idea. The car finally hit over 1227kph average. We used wheel speed and pitot pressure in the end (plus external time & distance).
 
Robert G8RPI

--- On Fri, 2/10/09, Predrag Dukic <stijena at tapko.de> wrote:


From: Predrag Dukic <stijena at tapko.de>
Subject: Re: [time-nuts] GPS from a window seat
To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
Date: Friday, 2 October, 2009, 6:53 AM







In fact, I think those limitations come from DoD.....

(to insure GPS cannot be used for some home made missile)




At 21:27 1.10.2009, you wrote:
> > Check the specs on your GPS...  many consumer GPS units will not work at
> > airplane velocities/altitudes.   GPS manufacturers don't want you using a
> > non aviation certified unit for airplane navigation  (plus they get big
> > bucks for the aviation units).
>
>The limitations implemented is either 60kft or (sometimes both) 1k knots.
>Both of these are out of reach for (current) commercial airliners. What
>GPS receivers did you test that used stricter limitations?
>
>--
>
>    Björn
>
>PS a random link to the CoCom limitations
>
>     http://en.wikipedia.org/wiki/CoCom
>
>DS
>
>
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