You don't really need a new network. Just one satellite to pickup the signals from the existing satellites, and re-transmit their time signal on a single encoded, yet easier to pickup, frequency. So it could just be one satellite.
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You don't really need a new network. Just one satellite to pickup the signals from the existing satellites, and re-transmit their time signal on a single encoded, yet easier to pickup, frequency. So it could just be one satellite.