[time-nuts] Computing GPS Distance Error in Time
Kasper Pedersen
time-nuts at kasperkp.dk
Mon Nov 4 18:37:01 EST 2013
On 11/04/2013 06:30 PM, Bill Dailey wrote:
> The pps on that unit is good. Compares favorably to the ublox6T. I can't say how favorably.
>
> I am working on quantifying its pps as compared to my 2 fury units and the ublox 6T.
They are pretty good, being dirt cheap nav receivers. In this plot, it
is identical to the MC-1010 (same reference design, same firmware).
http://cm.kasperkp.dk/mc1010ga.png (adev of various)
http://cm.kasperkp.dk/mc1010p.png (phase, fei5680)
The MC-1010 is using the 3339 chipset, and is GPS-only.
The MC-1010-G has the 3333 chipset, and is GPS+GLONASS.
When testing, try fast temperature shifts; I found that it would shift
the PPS much more than I expected, as if there is a rather slow filter
driving the PPS output.
>
> Have another trick up my sleeve but need a Linux kernel hacker. I don't want to go down another rabbit hole if I can avoid it.
>
I have stuck my fingers in the timekeeping code in the kernel, and
managed to get away unscathed.
If it is not too complicated, and interesting, shoot me a mail directly.
I reserve the right to decline, and the right to give up:-)
/Kasper Pedersen
More information about the time-nuts
mailing list