[time-nuts] Correcting measured PPS values with receiver sawtooth correction values

[Bob kb8tq]

Hi

Well … since you asked …. ummm… F9P:

Run a second  type of receiver ( Furuno GT-87 maybe)
Measure it
Sawtooth correct it
Compare corrected receiver A to corrected receiver B

Sure am glad that I’m too far away to be hit by that rock that just got tossed my way :)

Bob


> On Feb 15, 2019, at 2:33 PM, Mark Sims <holrum at hotmail.com> wrote:
> 
> I am adding the ability to Lady Heather to apply receiver sawtooth correction values to measured PPS values... this requires having a receiver that outputs sawtooth values as the main input device and connecting a TICC/counter measuring the receiver PPS output as an auxiliary input device.
> 
> There are six different ways of calculating the corrected PPS value:  add/subtract the previous/current/next sawtooth value from the measured PPS value.   The combination that works properly depends upon the receiver and counter.   It is easy to find the correct combination by trying each one and seeing which one produces the "best" results ("best" being determined by which one had the lowest corrected PPS span, average, sdev, variance, etc).
> 
> For all the receivers that I have tested there is only one combination that jumps out as being the correct one.   However, for the new Ublox F9P, there are two combinations that produce virtually identical measurements and statistics (add current sawtooth or subtract previous sawtooth).  Any ideas on how to determine which combination is the "correct" one?
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.