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

[Magnus Danielson]

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