Re: GPS 2R-M1 FINALLY LAUNCHED

On Wed, 28 Sep 2005 21:02:29 -0000, gavin@xxxxxxxxxxx (Gavin Scott)
wrote:

>Sam Wormley <swormley1@xxxxxxxxx> wrote:
>
>> Ref: http://www.ion.org/vol101/vol10.htm
>> Status of Additional Civil Signals
>[...]
>> A constellation of at least 24 space vehicles having the L5 signal is not
>> expected before about 2014.
>
>Yet the first manufacturer to incorporate support for L2 and/or L5 in
>their receiver chipset (assuming the antenna systems for L1 can be
>made usable at the new frequencies) so that they can advertise that
>they're "all frequency" or "L2/L5 ready" will have a distinct advantage,
>so I predict you'll be able to buy such a receiver long before it
>will be really useful, and I'm sure people will start whining about
>not being able to use the L2 signal within minutes of it coming
>online :-)
>
You can buy L2C compatible receivers right now. Trimble R8, Leica
System 1200 (1220 and 1230 only), Topcon/Javad (most models), probably
others (these are the only three I have used). For the Trimble, I
think L2C will be a big change as their L2 tracking is currently
pretty weak (do not recover code, use cross-correlation from L1).
Then you will see Trimbles performing like the Leicas, Ashtechs,
Topcons.

L2C-capable is certainly an advertising point for Trimble and Javad
right now.

I am not aware of anybody offering L5 (even Javad/Topcon who offer the
moon with every receiver). While we will see some L2C signals within
a few months (they say there will be six months of testing the IIRM
satellite), L5 is still at least 6 years away.

On the receivers which recover Y(W)-code on L2 which I have used,
tracking is typically 30 seconds or less. I expect that it will be
much quicker with L2C since there will be very little processing
required.

steve

>The GPS manufacturers will love this since they can sell at least two
>new generations of receivers to everyone over the next few years.
>

.

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