Technique of Signal Spectrum Analysis and Frequency-Hopping Masking Encrypt Based on Chaotic Sequence

When disturbance process of periodic signal occurs, Nonlinearity system produce bifurcation behavior which new frequency spectrum derives from every time. After infinite bifurcations , System turns into chaotic status and frequency spectrum become abundant [1]. The paper analysis the frequency spectrum of the Nonlinearity system and present application design method of chaotic Masking Encrypt technique of frequency-hopping using ergodicity , well relativity and white noise statistic character of chaotic sequence which Duffing equation produces.