NavList:

Richard,

It's my understanding that civillian Recievers can only process the C/A code in the L1 signal not the P(Y) code in the L1 and L2 Frequency?

That's why when I take my ship to sea, (where I expect to perhaps sail outside of DGPS range) I actually load up the encryption code so that my PPS receiver will process the P(Y) code in both the L1 and L2 carrier waves, allowing for corrections caused by Ionospheric and Atmospheric errors.

Am I incorrect? Are currect SPS recievers capable of using the P(Y) code?  If so, why is the "Crypto" still issued, and why does it make a difference?  Any clarification you provide I'd like to share with my collegues...and I'm about to eagerly read your paper to which you provided a link.

Thanks
Pete

Richard wrote 
> The underlying P-code (before encryption with the W-code
> to produce the Y-code) is the same on both L1 and L2 and
> civil receiver manufacturers have for years used this
> feature in dual-frequency receivers to provide the civil
> community with capabilties far superior to those typically
> required in military applications. As an example, at UNB
> we developed a machine control system with 2-centimetre
> accuracy.

----------------------------------------
Upgrade your account today for increased storage; mail forwarding or POP enabled e-mail with automatic virus scanning. Visit our member benefits page at https://members.canada.com/benefits.aspx for more information.