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Re: Foxhunting via satellite - additional



Also see 

Transmitter Hunting: Radio Direction Finding Simplified By Joseph D. Modell
http://books.google.com/books?id=RfzF2-fHJ6MC&pg=PA308&lpg=PA308&dq=%22oscar+6%22+location+finding&source=web&ots=Oq0NbQRgRY&sig=M5MQrC9otMPcCjrWT5hXh-tK5cI


73 Trevor M5AKA

--- Trevor <m5aka@yahoo.co.uk> wrote:

> First demonstrated on OSCAR-6 see 
> 
> (WO/1999/041723) APPARATUS AND METHOD FOR LOCATING MISSING PERSONS, ANIMALS,
> AND OBJECTS 
> http://www.wipo.int/pctdb/en/wo.jsp?IA=WO1999041723&DISPLAY=DESC 
> 
> "Animal tracking tags using Ultra High Frequency (UHF) Transmitters provide
> long-range tracking through orbiting satellite receivers by using very low
> data
> rates. The low data rates allow the use of very narrow bandwidths to
> communicate the animal's identification and to determine the animal's
> position
> by measuring the Doppler shift of the transmitter's carrier. This technique
> was
> first demonstrated using the OSCAR 6 amateur radio satellite and has been
> used
> to locate Emergency Locator Transmitters (ELT) from downed aircraft and
> hikers.
> Unfortunately, narrow band systems can only service a limited number of
> tags."
> 
> 73 Trevor M5AKA
> 
> 
> 
> 
> 
> 
>       ___________________________________________________________ 
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> http://uk.promotions.yahoo.com/forgood/environment.html
> 



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