Seems like a lot of unknowns.  You would have to
have sensors monitoring the sensors.

Do you lose too much by just maintaining a lifetime worst-case number, or
maybe some kind of probability function?



On 9/23/2011 3:45 PM, Poul-Henning Kamp wrote:

And then it gets nasty:
        Vehicle Thermal balance model
                a function of:
                Vehicle configuation
                Vehicle orientation
                Nearby objects (sun, planets, moon)
                Wavelength

        Clock model:
                a function of:
                vehicle temperature,
                bus voltage
                gravity
                magnetic fields from craft
                vibration (micrometeorites, think: Hipparcos)
                clock age
                random clock internal events




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