> I think you will find that this is obtained using the L2 frequency and
> data stream which I believe has a 10x data rate over the L1 data
> stream.

Not close enough for a cigar  ... available at the "L1" frequency there is
both a:

 1) C/A code (literally: Course/Acquisition) with a chip rate of 1.023 MHz
and a
 2) P code (literally: "Precision") with a chip rate of 10.23 MHz

-  but only "P code" available at L2 ...

Remember - GPS uses *spread spectrum* therefore a number of "data streams"
can exist simultaneoulsy in the same spectrum.

In fact. *all birds* share the same spectrum each utilizing a different
'code' ...

RF Jim



----- Original Message -----
From: "Alan B. Pearce" <A.B.Pearce@RL.AC.UK>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, September 30, 2002 3:14 AM
Subject: Re: [OT]: GPS current consumption


> > their error reading is around centimeters, since they have the
> > error correction algoritm (random error sent down on purpose -
>
> I think you will find that this is obtained using the L2 frequency and
data
> stream which I believe has a 10x data rate over the L1 data stream.
>
> The L1 frequency and data stream is just a "rough get you in the ball park
> quickly" fix and is the only data stream available to the open market.
>

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