Hi In a ground servo'd system, there is very little need for a Cs beam clock. The medium term stability of the Rb's is plenty good enough to allow the ground segment to keep up with / correct for what ever the space clocks are doing.
Bob On May 4, 2013, at 7:31 PM, Mark Spencer <mspencer12...@yahoo.ca> wrote: > The article available for download via this URL contains some history about > development issues with Rb and Cs Clocks for GPS. It seems at one point > after the GPS system was placed into service a development program for new Cs > GPS clocks failed and by necessity there was a shift towards Rb (at least for > a period of time.) > > http://www.insidegnss.com/node/281 > > I'm also speculating that the end of the cold war may have led to less > emphasis being placed on the GPS system being able to operate for long > periods of time without ground based intervention which would have further > reduced the need to develop new and improved Cs clocks for the new GPS > satellites. (In the cold war era I recall seeing estimates of how long the > GPS system could operate without ground based attention.) > > > > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
