[time-nuts] 1 pps correction

[Azelio Boriani]

And here:
www.cnssys.com/files/PTTI/PTTI_2006.pdf

Anyway, using a Dallas/Maxim DS1023-100 delay line (and a microprocessor,
of course) you read the @@Hn data from the iLotus M12M and apply the
correction to the delay line. Of course the delay line cannot anticipate
the PPS, so that you have to set a "zero" at the center of the delay line
total span. This fixed delay can, in turn, be nulled out using the M12M
capability to displace its PPS with respect to the UTC. Please, read the
M12M user manual and the DS1023-100 datasheet

<
http://www.ilotus.com.sg/~ilotus/sites/all/themes/zeropoint/pdf/m12m/M12M%20-%20User%20Guide%20(Ver%201.0.0).pdf
>

datasheets.maxim-ic.com/en/ds/DS1023.pdf


On Sat, Mar 31, 2012 at 3:48 PM, Azelio Boriani <azelio.boriani at screen.it>wrote:

> You can use a digital delay line to correct in hardware the PPS. The
> method is illustrated in the usual .PDF I always recommend:
> www.gpstime.com/files/tow-time2001.pdf
>
>
> On Sat, Mar 31, 2012 at 3:26 PM, Martyn Smith <martyn at ptsyst.com> wrote:
>
>> Hello,
>>
>> I’m a bit new to GPS receivers.  I’m reading all about sawtooth
>> correction of the 1 pps output signal, on the ilotus M12M or M12+.
>>
>> I understand that correction can either be hardware controlled or
>> software controlled.
>>
>> Does anyone make a low cost stand alone board to carry out this
>> correction?
>>
>> I.E something that takes the raw 1 pps and serial data from the GPS
>> receiver and produces a cleaner 1 pps output?
>>
>> I’ve seen that the peak to peak jitter is reduced from something like 27
>> ns to < 10 ns.
>>
>> Is this a reduction of just the jitter, or is the actual accuracy to UTC
>> also improved by this amount.
>>
>> Regards
>>
>> Steve Jones
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>