[time-nuts] SE880 GPSDO

Bruce Griffiths bruce.griffiths at xtra.co.nz
Tue Apr 26 16:25:55 EDT 2016


On Tuesday, April 26, 2016 02:40:14 PM Attila Kinali wrote:
> Ciao Ilia,
> 
> On Tue, 26 Apr 2016 02:24:04 +0200
> 
> Ilia Platone <info at iliaplatone.com> wrote:
> > Just for informations, as I must build the board from scratch, does this
> > design is good to implement into the datalogger?
> > I mean, for the second RTK purpose, does this u-blox module satisfy my
> > requirements (link below)?
> > http://www.opendigitalradio.org/lea-m8f-gpsdo
> 
> I cannot say. I don't know what your requirements are and thus
> cannot say what a good design choice is.
> 
> Yes, the LEA-M8F does support the output of satellite phase data.
> Yes you can use that for RTK. BTW: this is stated in the documentation
> for the module. You just need to read it.
> 
> BTW2: is this a hobby project or is this a work project?
> 
> 			Attila Kinali
Specs are:

1) Relative position of any pair of clocks located up to 2km apart has to be 
known to within 3cm or so. Post processing is OK, however differential Earth 
tides between the clock locations may need to be considered.

2) The difference in the time offset between any pair of clocks located up to 
2km apart shall not vary by more than 200ps (1ns time stamp quantisation) or 
2ns (10ns timestamp quantisation) over an 8 hour period (at night).
Post processing of data to fit wander etc is not practical as the SNR is too 
low to support this.


Bruce


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