Hi Karl: Tom Clark may be the person who can answer that question.
I seem to remember that the very first GPS satellites had antennas only aimed at the Earth, but because many satellites now use GPS for a number of functions they also radiate some signal away from the Earth. In addition there's the question of getting a license for a military grade GPS receiver. Note that civilian grade GPS receivers have limits on elevation, speed, acceleration and jerk which prevents them working in military aircraft, missiles and space environments. It may be that the your satellite already has a GPS receiver for some other purpose so that you only need access to the 1 PPS or 10 MHz output? Have Fun, Brooke Clarke http://www.prc68.com Strauss, Karl F wrote: > I've been tasked (or was it I was volunteered?) to do some basic design & > definition work on an ultra-stable master frequency system for a proposed > instrument that is currently planned to be in an Earth-trailing orbit. > Given the first order accuracy requirement of 1 part in 1E-10, my first > thought was to grab the GPS timing signal. > > Sorry for the newbie questions here: a) Do all satellites in the > constellation broadcast a signal into space (as opposed to, say, bouncing > off some ionospheric boundary layer); and b) is there some website/technical > paper describing expected signal strength for these space-radiated signals? > > Again, apologies to all for the Newbie Q's. Hopefully this will be a fun > topic of discussion > > Thanks > > Karl > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
