[time-nuts] Disciplining Rubidium

[SAIDJACK at aol.com]

Hi Bjoern,
 
1cm RMS is not bad. That would be great to use for Auto Surveying the  
Antenna position.
 
I meant integrated receivers with 1PPS or 10MHz etc output that are  based on 
Carrier Phase measurement, and are better than an M12M. I know of some  
GPSDO's that are carrier phase based, and around $8K if I remember  correctly.
 
Haven't looked into how to use Carrier Phase to generate more accurate 1PPS  
pulses, but one thing I remember (maybe incorrectly?) is that one has to get 
the  Ephemeris and Ionospheric delay measurements etc from USNO or NIST(?) or 
so  do to the post processing when doing surveying? 
 
As you can see, I am not the expert on Carrier Phase. Do you know of any  
timing receiver that uses this to generate 1PPS with E-011 accuracy 1s tau? What  
is involved in using the Carrier Phase info to improve timing accuracy?
 
thanks,
bye,
Said
 
 
In a message dated 4/24/2008 07:26:47 Pacific Daylight Time,  
bg at lysator.liu.se writes:

What is  affordable for you?

For some $330 you can get a L1 GPS receiver  outputting carrier phase
measurements at 5Hz. This receiver also have a  10MHz tcxo driving the
whole receiver. Pseudorange measurement rms of a few  dm. Carrierphase
rms below 1cm.

Btw... the Oncore VP did  carrierphase measurements.

--

Björn





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