On 3/8/11 9:08 PM, Kevin Watson wrote:
Hi All. Thanks for responding. There are quite a few GPS receivers that will work outside of the usual commercial-grade GPS limitations, but I'm not too sure I need such a receiver. As my application is to just accuratly time-tag messages for a data recorder, my thinking is to allow a ruggedized GPSDO to stabilize on the pad before launch, and then just before launch force the GPSDO into holdover mode and act as the PTP grandmaster for the onboard computers until we reach orbit. Once on orbit I have other means to synchronize the PTP grandmaster.
I'd start by not worrying about discipline.. look up companies like Wenzel or Vectron or Q-tech and find an oscillator that is "good enough" to hold your timing performance over the environment you need.
That oscillator and some logic to make a suitable clock would probably do you.
You probably don't even have a particularly wide range of temperatures during the flight (although you probably do have a wide test range, to make sure it works)
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