| The issue of how to protect regular work from interference caused by aggressive devices has become a big problem. Frequency-hopping (FH) has great advantages of anti-jamming, low interception, anti-fading as well as the application in multi-address networking. So, FH has been widely used in modern military communication, especially in tactial anti-jamming radios.The synchronization is one of technologies in FH communication, and it is the key link to establish synchronization quickly and reliably in FH communication. Based on the research of frequency hopping (FH) communication system, a new synchronization method-dynamic double frequency synchronization method is proposed. This method adopts distributed FH sequence controlled by chaotic, hopping with double frequence and frequency presets and acquisition, supports multi-user FH communicaton with distributed construction of WLAN. It has the strong ability of quick transmitting baud rate, anti-jamming, relay transmission and no switching in both transmitting and receiveing signals. A model of FH communicaton system is established through Matlab's Simulink. According to Logistic system, universal algorithm is adopted to produce chaotic sequences. DDS is chosen as the frequency synthesizer, and the assignment of addresses is realized by combing FDMA with CDMA .It is compared with traditional FH synchronization scheme. The results show that the synchronization method is simply accomplishing, and anti-jamming to broadband can reach 10-3 when frequency hopping gian is 3. This sheme is an ideal scheme for construction of tactical FH radio. |
PDF Full Text Request