A lot of the ballistic GPS systems are actually GPS transponders attached to 
the back of the shell.  They just retransmit the received GPS signal spectrum 
to a remote receiver.  Much cheaper and more robust than slinging a full GPS 
receiver.  Google TIDGET for more info... 

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At the high-end of the spectrum of the technology is the gun-barrel  
launched artillery shell with crystal oscillator built-in, that has to 
withstand  
and operate with 10,000 to 20,000 g acceleration!
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