Thanks for the response Björn. Also thanks to Didier Juges for pointing
out that this has been covered on a previous thread. I'll go and find it
in the history.
Unfortunately the device will be used in urban areas so some multipath &
obstruction of skyview is expected. I've just done some testing on my
OCXO and it has a maximum sensitivity of about 5 ppb / *g*, which is
notable, but shouldn't present a problem. I've yet to explore the
vibration effects - thanks for pointing my attention to the motion
effects on the OCXO itself, its an aspect I'd otherwise have overlooked.
Daniel
[email protected] wrote:
Hi Daniel,
Hi,
I've recently completed a GPSDO using the pps output of a uBlox Antaris
TIM4 GPS module to discipline a 10MHz OCXO. I'm now investigating the
motion effects (acceleration/uniform velocity) on the accuracy of the
time-pulse and hence on my frequency output.
Are you moving around in areas with little obstruction for the GPS antenna
towards the sky? Then I would first look at the dynamics inpact on your
OCXO.
I've been unable to find any detailed information on the relationship
between the accuracy of the pps output and the effects of having the
receiver in motion (i.e. in a car/boat, at velocities far below the
modules operating limit of 515m/s) - I'd appreciate some input on this
matter. Does motion cause increased jitter?
Tilting/accelerating your GPS oscillator might possibly yield an effect.
Other than that there is no theoretical advantage keeping your receiver
stationary. All its measurements are done against satellites moving at ca
4km/s.
--
Daniel Davson
HW Design Engineer
Peralex Electronics (pty) ltd.
Peralex House, 5 Dreyersdal Rd,
Bergvliet 7945, South Africa
Tel: +27 21 710 7446
Disclaimer: http://www.peralex.com/disclaimer.html
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