> > And a $80 GPS puck giving meter position accuracy is too expensive ?

> No this is not too expensive. Where would I find one? What are they like
> to integrate? The vehicle is autonomous so this would be a great
> solution.

What is being referred to is the use of ANY GPS receiver to give you
positional accuracy of from 1m to 10m without reference to the base station.
(They access the GPS satellite constellation instead).
GPS receivers are available in NZ form eg DSE from about $NZ300 up BUT
almost any GPS module or receiver with an output would do. Many receivers
have a 4800 baud serial output which is very easily read by a
microcontroller to determine (amongst other things) speed, position in 3
dimensions and time of day.

If you want to use a UHF link - you can buy a pair of UHF transceivers from
eg DSE for about $NZ120. These will probably achieve a range of 2 to 3 km if
placed on a pole with a clear line of sight. Range is much less if hand held
and with obstructed sight lines. NZ max allowed power output is
substantially greater than that allowed in some other countries.



        RM

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