On Mon, Nov 10, 2008 at 5:27 PM, Strauss, Karl F <[EMAIL PROTECTED]> 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.
Depending on your application requirements, I wonder if an OCXO (Oven Controlled Crystal Oscillators) in a ruggedised packaging might be suitable for your needs. For example one well-known frequency source vendor, Symmetricom offers a number of OCXO packagings that may be suitable for satellites. <http://www.symmetricom.com/products/frequency-references/high-reliabilityruggedized-frequency-sources/> Another option would be a Rubidium (Rb) frequency standard. A lot depends on your "accuracy" definition and requirements. Does it need to be accurate relative to UTC / UT / TAI? Depending on your application, dealing with details like leap seconds may not be worth staying in sync with UTC / GPS. Or do you need a stable local clock (within the SV)? Are you concerned with accuracy / stability over a short period of time (e.g. 1 second) or a longer period of time (e.g. 1 day / month / etc.)? _______________________________________________ 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.
