[time-nuts] Speaking of Costas loops

J. Forster jfor at quikus.com
Wed Jul 3 14:55:11 EDT 2013


A 'bent pipe' or retroreflector doubles any Dopplar from range rate.

-John

================



> On Wed, 3 Jul 2013 08:29:02 -0400
> Bob Camp <lists at rtty.us> wrote:
>
>> There are two batches of GPS / WAAS sats up there:
>>
>> 1) The ones with numbers above 100 that are geosync and that only do
>> WAAS
>>
>> 2) The ones with numbers <= 32 that do nav. These are not geosync.
>>
>> I believe the only ones with corrected / high stab clocks on board are
>> those in the second group. The stuff in the first group aren't dedicated
>> sats, just leased transponders on conventional multipurpose geosync
>> birds.
>
> I don't know about WAAS, but AFAIK the EGNOS signals are generated on
> ground using Cs references and retransmitted by the satelites using
> a "bend pipe". Ie. the signals should be of time-nut quality even without
> high accuracy frequency standards in the birds themselves.
>
> (Sorry, i'm not able to find where i read about that, so no references
> today)
>
> 			Attila Kinali
>
> --
> The people on 4chan are like brilliant psychologists
> who also happen to be insane and gross.
> 		-- unknown
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