Don't forget that you can measure a flying object from the ground. I can
imagine 3 measurement points, each of them are pointing to the same object
(by laser for example) and then calculating the altitude and position
(therefore the speed) by trigonometrics.

Tamas


On 3/26/07, Alan B. Pearce <A.B.Pearce@rl.ac.uk> wrote:
>
> >> For a few thousand  the surveyors here in the states are
> >> supposed to get accuracy down to inches.
> >>
> >
> >Yes, but to get that kind of accuracy they leave their GPS
> >receivers listening for hours averaging out the errors over
> >time. Not the case here.
>
> I always understood they were licensed to use the high accuracy data
> stream,
> not the normal one used for consumer GPS. They certainly cannot wait
> around
> for ages to get an average done.
>
> --
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>



-- 
unPIC -- The PIC Disassembler
http://unpic.sourceforge.net
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist