[time-nuts] OT - DC-10 gyros
DaveH
info at blackmountainforge.com
Fri Mar 29 03:49:35 UTC 2013
Just an idea -- if 440 Hz would work, there are a lot of electronic tuning
fork circuits out there.
Here is one:
http://www.spaennare.se/tfork.html
You could choose another crystal frequency or divide-by ratio if it needs to
be 400.00
Add a phase-shift circuit to get the other two phases (if needed),
amplifiers and you are good to go.
Dave
> -----Original Message-----
> From: time-nuts-bounces at febo.com
> [mailto:time-nuts-bounces at febo.com] On Behalf Of bg at lysator.liu.se
> Sent: Thursday, March 28, 2013 05:48
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] OT - DC-10 gyros
>
> Hi Bill,
>
> > Well, I can come up with something topical, read on. :)
>
> [snip]
>
> > Topical in a more abstract way, strapdown systems really are very
> > interesting. They require precise integration of the rate
> output over
> > time to derive velocity and position, and really weren't
> practical until
> > the 70's when small enough computers existed to do the requisite
> > calculations. (I worked on the nav system for the Trident
> missile back
> > in my Draper Labs days).
>
> Well, for the analysis of your gyro performance, time-nuts are already
> equiped with one of the tools used - the Allan Variance.
>
> http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=4404126&tag=1
>
> There is also the relation
>
> GPS & oscillator -> GPSDO
>
> where in the navigation field
>
> GPS & 3x gyro + 3x accel -> GPS stabilised inertial
> navigation
> system
>
>
> --
>
> Björn
>
>
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