Research On Overall Structure And Protocols Of Dynamic Double Frequency Hopping Communication Station

Dynamic double frequency hopping communication system with high security, strong anti-interference and stability performance has important application prospects in the field of modern military communication. Based on the existing dynamic double frequency synchronization scheme and its system simulation research results, a further study on the overall structure and its protocols of the dynamic double frequency hopping station (hereinafter referred to as frequency hopping station) was made using the "top-down" design method,so the top-level design and some interface problems of the underlying modular design were solved. Firstly, the related theories of the dynamic double frequency hopping communication system which was a distributed frequency hopping communication network composed of N frequency hopping station with equal communication authority within the network was elaborated. Then based on the basic characteristics of this system, the overall structure and related data protocols of frequency hopping station were mainly studied and the top-level structure of frequency hopping station was built under the SOPC system development platform based on Nios Ⅱ with Nios Ⅱ CPU to complete the synchronization control of each subsystem (frequency hopping code generator, frequency control word ROM, direct digital frequency synthesizer, transmitter module and receiver module five function modules), which could make multiplex working mode of N+2signal reception and three sigal radiation processing channels to jump to work together. On the basis of the top-level structure design of the station, a further study on some key technologies such as the function, synchronous working principle, internal structure and external interface of each subsystem was made. Finally, based on the FPGA, some modules or units (DDS, BPSK modulation, demodulation and parallel state detection in the receiver module unit) were designed and simulated. The functional simulation debug showed that the related structure and protocols were reasonable and realizable.