[time-nuts] Followup (still want a GPS-type NTP refclock)

[SAIDJACK at aol.com]

Let the GPS average the antenna position over a very long time.
 
On a good GPSDO one can select the number of averages, and the position  
variance before the survey is finished, and the (now very precise) position is 
 stored in memory.
 
Indoors this may take a very long time to do (weeks?), but should work too. 
 The problem indoors is multi path, one never knows where the signal is 
coming  from that is seen. Setting up signal squelch in the GPS really helps 
with that,  for example the C/No could be set to a minimum of 35dB, and 
anything below that  is ignored so only the strongest signals are used.
 
We made a customer's urban solution work that way, it effectively  deleted 
all the multipath issues he had from adjacent high-rises, since the  
multipath signal strengths yielded about 20 to 28dB C/No and were thus all  
squelched, whereas the direct signals were 35 to 50dB C/No.
 
bye,
Said
 
 
In a message dated 10/18/2012 08:26:07 Pacific Daylight Time,  
azelio.boriani at screen.it writes:

OK,  unless you have the coordinates of your antenna position... and here
comes  the difficult move: how can I have the coordinates of an indoor
antenna  that can't receive the required satellites? Starting from a
suitable  outdoor position then using precise length and angle measurements,
yes, it  can be done.