Research Of Communication Technology For Frequency Hopping Privacy

Frequency hopping communication is a communication manner by controlling the carrier frequency hopping randomly. It has features such as anti-interference, resistance to intercept, code division multiple access and frequency sharing performance, etc. It has been widely used in modern military communication and civil mobile communication. With limited confidential performance, FH communication would need an encryption technology.In this paper, we studied FH communication system, such as the performance analysis of the FH signal, the baseband modulation technique which the FH adopted, synchronous technology, especially FH coding. On the other hand, we studied the principles and design methods for a block cipher and chaotic cryptography.We researched and analyzed FH pattern encryption,then according to the characteristics of FH system,a chaotic block encryption algorithm combining with logistic mapping is proposed,which is suitable for FH coding. And a FH pattern encryption scheme is designed based on this algorithm.Finally, based on this FH pattern encryption scheme, we designed and implemented a high-speed FH confidential transceiver. Transmitter and receiver design scheme was present, with analysis of its performances. And we designed detailed implementation schemes for FH pattern generator, RF frequency synthesis and FH information encryption. Then the FH system's performance was tested and analyzed.