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

Azelio Boriani azelio.boriani at gmail.com
Fri Jul 10 09:23:51 EDT 2015


>From <http://www.gps.gov/systems/gps/space/>
Block IIA: 3 operational
Block IIR and IIR(M): 19 operational
Block IIF: 9 operational
so they should be 31 satellites working.

On Fri, Jul 10, 2015 at 7:20 AM, Magnus Danielson
<magnus at rubidium.dyndns.org> wrote:
> 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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