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

Magnus Danielson magnus at rubidium.dyndns.org
Fri Jul 10 12:23:24 EDT 2015


Yes, and the 10th Block IIF is 4 days from launch.
We can expect there to take some time before it is brought into the 
constallation.

It's only with Block III that we can expect this extended set of PRN 
codes to be supported and used.

Cheers,
Magnus

On 07/10/2015 03:23 PM, Azelio Boriani wrote:
>  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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