Remember, that if you have 4 receivers you get X, Y, Z and T of the
source, and in this case T will be the phase-drift of the rocket. So, if
logged with sufficient precision, the stability of the on-board clock
may not become as important as the fact that it is there and has
reasonably good phase-noise. That however, might be an issue for
sounding-rockets, but can be addressed to some degree by mounting.
Cheers,
Magnus
On 03/28/2015 01:25 PM, Peter Reilley wrote:
Some crystal oscillators specify their sensitivity to G forces.
Here is one:
http://www.abracon.com/Precisiontiming/AOCJYR-24.576MHz-M6069LF.pdf
Available here:
http://www.digikey.com/product-detail/en/AOCJYR-24.576MHZ-M6069LF/535-12627-
1-ND/4989033
Others specify shock and vibration limits but say nothing about
frequency stability.
Pete.
-----Original Message-----
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Chris
Albertson
Sent: Friday, March 27, 2015 9:55 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Need advice for multilateration setup
On Fri, Mar 27, 2015 at 10:29 AM, Chuck Harris <cfhar...@erols.com> wrote:
The biggest problem I see is the crystal oscillator in the rocket is
going to notice the G forces during acceleration in a pretty big way.
But all of the ground stations will see the same frequency shift on the
rocket's transmitter. I think this can be backed out in processing.
Someone needs to write the equations and post them here.
_______________________________________________
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.
