[time-nuts] Speaking of Costas loops (WAAS)

[Bob Camp]

Hi

If there are no receivers using the service (WAAS as a full GPS sat), it's either because:

1) Nobody knows about it 
2) It does not work

Either way why spend the money to keep it running much better than needed for WAAS simply for it to be there unused?

Bob

On Jul 10, 2013, at 8:14 PM, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:

> On 07/11/2013 01:45 AM, Bob Camp wrote:
>> Hi
>> 
>> If the WAAS  birds are run in a fashion that gives a true GPS payload performance, why not assign them a SN 32 or below and use them?
>> 
>> If the WAAS birds are not in the "right numbers", why bother to set them up and spend the bucks to make them behave like a nav sat? What's the payoff?
> 
> In the old days (receiver channels are sparse resource):
> If you devote a receiver channel to receive it, let it contribute to position while it provides the core corrections.
> 
> In todays world:
> Channels and GPS birds are many, WAAS only contribute to precision and validation.
> 
> This assuming relatively normal commodity receivers.
> 
> The fancy receivers (double-frequency, full-blown carrier-phase pseudo-ranges) had little extra use of the WAAS, except possibly somewhat quicker lock-in if not being fed from a national reference grid.
> 
> Cheers,
> Magnus
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