[time-nuts] PN sequence generation using GPS

Chris Albertson albertson.chris at gmail.com
Wed Feb 23 02:06:29 UTC 2011


On Tue, Feb 22, 2011 at 3:52 PM, Hal Murray <hmurray at megapathdsl.net> wrote:

> A PPS signal from a GPS would provide a nice way to get started, but it needs
> a correction for the speed-of-light delay.  I don't know if finding that
> delay would be easier or harder than traditional methods for getting the
> receiver in sync.

Even in the best case there you have line of sight how do you know the
distance to the transmitter unless you know the location?   Then if
there is  bounces off the ionosphere or "wrong way" paths using the
longer of the two great circle paths. It gets very much harder

I think GPS can help by using it to control the transmitter and to set
the receiver frequencies but the "phase" of the frequency hop clock is
determined by the time of flight of the signal, something a receiver
can't know in advance



-- 
=====
Chris Albertson
Redondo Beach, California



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