A nonlinear dynamics method for signal identification.
When a radio frequency signal is radiated by a transmitter, the properties of the transmitter itself affect the properties of the signal. These transmitter-induced changes are known as unintentional modulation, to differentiate them from intentional modulation used to add information to the signal. The unintentional modulation can be used to identify which transmitter produced a signal. This paper shows how phase space analysis based on nonlinear dynamics ideas can be used to determine which of several amplifiers produced a signal.
Carroll
T L
TL
U.S. Naval Research Lab, Washington, DC 20375, USA. Thomas.L.Carroll@nrl.navy.mil