| The system of frequency hopping communication has been widely used in bothmilitary and civilian fields because of its strong anti-interference ability, high securityand low probability of intercept.Firstly, this paper studies the frequency hopping pattern, improved randomtranslation alternative method to achieve a wide interval of frequency hopping, whichselected m sequence as pseudo-random sequence. Improvements simplify thealternative algorithm and enhance the uniformity of the random sequence.Secondly, a new type of mixed-speed with frequency hopping synchronizationmethod is designed, which construct a dual-frequency-hopping pattern used for systemsynchronization and voice transmission. At the sending end, the information of coarsesynchronization, slender synchronization and audio are sent in turn at the normal speed.At the receiving end, the information of coarse synchronization is received at highhopping speed in the process of scanning and capturing and synchronizationconforming. The information of slender synchronization is received at low hoppingspeed in the process of tracing and correction. And the information of audio is receivedat normal hoping speed. Then the Service synchronous frame structure optimizationdesigned in order to improve the information transmission efficiency, then the systemperformance analysis shows that the synchronous capture probability is high, theaverage acquisition time is short,strong anti-interference performance.Final selection of the AT91SAM7S256microprocessor chip and the CC2500RFchip experiment platform as the core device, the entire frequency hoppingsynchronization scheme are realized, given the test results on the hardware platformand analysis and verification of the reliability and superiority of the program. |
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