In uk.transport.london message ,
Sun, 20 Apr 2008 01:42:16, Clive D. W. Feather clive@on-the-
train.demon.co.uk posted:
In article , John Rowland
writes
How do the receivers cope with dozens of satellites

31

all broadcasting on the
same frequencies? Time splicing?

As I understand it, the signals are not on a single frequency but
rather jump around a set of adjacent frequencies ("spread spectrum").
Each satellite uses a different pattern of jumps repeating every
millisecond, so you can tell which satellite you're picking up by
recognising the pattern, and the different patterns mean that two
satellites are never (or hardly ever) on the same frequency at the same
time.

ftp://tycho.usno.navy.mil/pub/gps/gpssy.txt, "GPS SIGNAL
CHARACTERISTICS". Let us hope that their technology is better than
their spelling.

--
(c) John Stockton, nr London, UK. Turnpike v6.05.
Web URL:http://www.merlyn.demon.co.uk/ - w. FAQish topics, links, acronyms
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Dates - miscdate.htm moredate.htm js-dates.htm pas-time.htm critdate.htm etc.