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Bill,

> You speak of a brute-force attack on the satellites.  In fact the signals
> are relatively weak, and therefore targets for jamming.

This is not easy if possible at all.
I remember the attempts of the Soviets to jam all
foreign Russian-language broadcasts in 1970-s.
(Voice of America, BBC, Free Europe and German wave).
Someone counted that they spent on this 10 times as much
as the cost of the broadcasts was. And they failed,
even in the major cities. People were listening these brosdcasts
everywhere
with ordinary (Soviet made) receivers.

It is much harder to jam a signal coming
from the sky on very short waves.
(Roughly speaking, you have to send the jamming signal from
the same direction, but this is clearly impossible).

Destroying a US military satellite will probably mean
a full scale war with the US, which I think is unlikely.
A more plausible scenario is the US making GPS non-available
to "the public", if threatened by missiles guided by the same GPS.

Alex.

   

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