[time-nuts] Jupiter GPS receiver

Bjorn Gabrielsson bg at lysator.liu.se
Thu Jan 5 15:56:17 EST 2006


Alberto di Bene <dibene at usa.net> writes:

> Just curious on another topic : I have seen advertized GPS boards with 20-channel
> capability, Given that, at least based on my direct experience, even with a clear
> horizon you rarely have 12 satellites in view, what does buy you having that
> capability available?  

In case the correlator banks are strictly assigned to a receiver
channel, multiple channels could assist in looking for a specific
satellite signal. Now vith 30 (29?) live satellites having 12 normal
satellites and one or two SBAS (WAAS/EGNOS/MSAS) sats are not
uncommon. In general the more correlators you have the quicker
acquisition / reacq. you will have.

Having a stationary scenario, with a good antenna placement, surveyed
position and looking only for good timing performance. Whats the
benefit of 12 channels over 6? You are already having 5 reduntant
channels... 

With the present positioning measurement noice on good receiver down
in the some dm range - focusing on translating that receiver noise
also to the PPS signal, is more important. On the other hand. Sub 1us
noise PPS pulse is good enough for my NTP use... 





More information about the time-nuts mailing list