Hi

The big(er) deal with some systems is that they offer encrypted services. If 
you happen to have 
access to the crypto version, that’s going to help you. As long as you are 
using “public” (and thus
fully documented) modes … not a lot of difference. The same info that lets 
anybody design a 
receiver lets people design a spoofing system. 

Bob

> On Aug 14, 2017, at 11:54 AM, John Hawkinson <jh...@mit.edu> wrote:
> 
> So, what I wonder: to what extent (if any) are GPS, GLONASS, and Galileo 
> sufficiently different that it is challenging to spoof all three in the same 
> way? Is there any reason why it is more than 3 times the work to spoof all 3?
> 
> Is there something clever receivers can do, with awareness of all three 
> services, that makes them harder to spoof (beyond checking the services 
> against each other)?
> 
> --jh...@mit.edu
>  John Hawkinson
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