A loud protest you say? Do you not realise we are at war after all.


----- Original Message -----
From: "David Sarraf" 
To: 
Sent: Monday, September 24, 2001 6:01 PM
Subject: War-time GPS


The GPS time signal is used to synchronize transmissions of packets from the base
stations to the mobile phones.  This keeps the phone and base station synchronized to
minimize collisions with packets from other phones using the same base or cell.
Proper time synchronization between bases is important to avoid dropouts when handing
off a phone from one base station to another.

There would likely be a loud protest if the GPS signal was degraded so much that it
caused the cell system to quit working.  Conversely, it is unlikely that the cell
phone folks would build a system on something that was by definition selectively
available.  Perhaps even the degraded signal is good enough for them.  If so I would
think it is also good enough for seismographic data logging.

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