[time-nuts] Number of GPS sats in the sky?

Magnus Danielson magnus at rubidium.dyndns.org
Fri Jul 10 01:20:24 EDT 2015


Well, you would think so...

There is 37 PRN codes, of which the top 5 is for testing.
However, in the modern ICD:
http://www.gps.gov/technical/icwg/IS-GPS-200H.pdf
you will find that there is an extended set of PRN codes, and for the 
C/A code the modulation is the same, just that the transmitted PRN is 
shifted. This extended system can hold 64 active birds in the constellation.

Cheers,
Magnus

On 07/10/2015 03:19 AM, Mark Sims wrote:
> The GPS system is pretty much limited to 32 active satellites.   There are currently 29 satellites broadcasting usable navigation data.   Plus some WAAS signals from geosynchronous orbit.    		 	   		
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