.fh / Ds Radio Frequency Hopping Pattern Design And Frequency-hopping Encryption Technology

Possessing the strong ability of anti-jamming, anti-fading, anti-interception as well as the application of multiple access,frequency hopping(FH) communication is widely used in the modern military communication.As one of three essential technical factors of FH communication system,frequency hopping pattern plays great part in FH communication system.Based on practical applications,this thesis presents the FH patterns what FH/DS radio needs.For meeting the military radio needs,we encrypt the FH system with stream cipher to enhance it's security.It is a good way to guarantee information safety and improve the properties of FH sequences .Fairly good chaos map,which is of high performance and be implement easily is selected.With the introducing of appropriate perturbation aimed to change the initial conditions ,we may enlarge the chaotic sequence period under finite precision in practical applications. Mixed chaotic model is constructed by combining Logistic sequences and m-sequences in form of exclusive-OR.And we ,by adding two mixed chaotic model,constructed double chaotic system to generate the key generator,which provides with excerllent cryptographic properties.Under finite precision ,ways we always seek is easy to implement.And we encrypt the FH system with chaotic stream cipher.Simulation results show that the security properties of FH sequence have been improved and the security of information is guaranteed even the FH patterns are broken.