[amsat-bb] Re: Foxhunting via satellite
m5aka at yahoo.co.uk
Wed Oct 10 13:34:44 PDT 2007
First demonstrated on OSCAR-6 see
(WO/1999/041723) APPARATUS AND METHOD FOR LOCATING MISSING PERSONS, ANIMALS,
"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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