Frequency Hopping System And Its Networking Technology Research

With the drastic frequency competition of communication, the usual communications with fixed frequency suffer from a serious threat. To ensure reliable communication capability, hopping communication system emerges. Frequency hopping communication technology has excellent anti-jamming performance and the multiple access network capacity. It has not only been widely used in military communication, but also in civil mobile communication, and its effect has become increasingly evident.This paper conducts an in-depth study of frequency hopping communication system, which includes depth discussion of the design and selection of the frequency hopping sequence, the frequency synthesizer design and realization, the frequency hopping synchronization and the frequency hopping network technology. The RS sequences have been chosen as a pseudo-random frequency hopping sequence, and the RS sequence production method has been introduced. Under Quartus II Integrated Development Environment, the concrete realization to the RS frequency hopping sequences production has been carried on. The correlation performance of the results to it has been validated under the Matlab environment, and the good autocorrelation characteristic of RS sequence has been confirmed. Based on the working principle and characteristics of Direct Digital Frequency Synthesizer, the principle functions of Direct Digital Frequency Synthesizer has been designed and carried in FPGA. From the aspects of the carrier wave synchronization, the bit synchronization, the frame synchronization and the network synchronization, the technology of the frequency hopping synchronization have been analyzed and discussed detailedly. And this paper detailedly discusses the method of realization of the carrier wave and bit synchronization, and designs and realizes the bit synchronization clock extraction under Quartus II IDE. And it detailedly expatiates the frame synchronization and the network synchronization methods. Finally this paper analyses the mode of frequency hopping communication networking, and discusses the procedure of frequency hopping communication networking.