Anti-jamming of chaotic signals

Abstract

It is found that the amplitude-modulation disturbance can make the chaotic output signals of Chua's (1986) circuit jump into a limit cycle. This is because the limit cycles usually encircle the chaotic orbits in the phase portraits of the Chua's circuits. The four jamproof methods adopted in our physical experiments are the limiter for clipping the sum of the chaotic signal and the disturbance signal, the adjustment of the linear resistance R which controls the slope of the load curve of the nonlinear resistance in Chua's circuit, the restarting of the Chua's circuit for retrieval of the chaotic state, and the circuit shielding measures.