[time-nuts] Need advice for multilateration setup
magnus at rubidium.dyndns.org
Fri Apr 3 07:19:59 EDT 2015
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.
On 03/28/2015 01:25 PM, Peter Reilley wrote:
> Some crystal oscillators specify their sensitivity to G forces.
> Here is one:
> Available here:
> Others specify shock and vibration limits but say nothing about
> frequency stability.
> -----Original Message-----
> From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Chris
> 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 <cfharris at 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.
More information about the time-nuts