Anti-jamming of chaotic signals

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