Synchronous Distributed Adaptive Frequency Hopping Communication System And Its Simulation Study, Based On Dynamic Dual-band Hopping

Dynamic Double Freqency Hopping Synchronization (DDFHS) is a frequency hopping synchronization program, specifically designed for Distributed Adaptive Frequency Hopping Communication System (DAFHCS)with high security, high interference immunity, high stability, good scalability and good operability. In this dissertation, using Matlab/Simulink, we designed a kind of DAFHCS which based on DDFHS and call it Double Freqency Hopping Communication System (DFHCS).According to the characteristics of DAFHCS and combined with the technical points of DDFHS,the synchronization control protocol and the adaptive interference avoidance protocol which based on DDFHS are proposed. Accordingly, we designed the synchronous control module, automatic interference avoidance module and other Basic frequency hopping communication module,then, using these modules, we form a complete DFHCS.The DFHCS use a parallel demodulators structure to achieve the timing control of double frequency hopping and the real-time update of frequency hopping code.In order to test the performance of synchronization and the bit error rate, we use broadband blocking jamming, partial band interference and multi-frequency continuous wave interference as the test environment. The simulation results show that DFHCS is technically achievable, the establish process of synichronization is simple, rapid, and safe.According to the different types of interference, the system can automatically enter the appropriate mode, that makes it enjoy a strong anti-jamming capability, consistent with the requirements of modern military communications systems.