The Spectrum System Of Frequency Hopping Based On The SDR Platform

All who use shortwave communication in the vast area hope the communication unblocked and secret.However,eavesdropping,electronic counter and channel congestion have become big problems.Conventional short-wave radios send and receive signals in the fixed frequency so that they cannot avoid the problems above.Using the frequency hopping technique All these problems could be thorougly overcomed.The frequency-hopping communication technology is one of the most rapidly developing technologies based on the environment u nder which modern information confronts increasingly fiercely.The fr equency-hopping communication has a strong anti-search, anti-seizure and anti-jamming capability.Therefor, all the countries pay great att etion to the development and application of the technology.In the c urrent conditions,Military frequency-hopping technology has been us ed widely.The-future direction of the technology is wide-broadband, high-rate and digital and the potential of the information warfare is huge.In the high frequency hopping,the synchronization is the core of the problem.Based on analyzing the spectrum, the paper realizes the frequency-hopping synchronization by testing the spectrum of the singals and realizes it on the SDR platform.The speed can reach 5000 hop per second,and the time needs 5 to 6 periods.In the realizing process,the author fully using DSP of TI company and the FPGA from the Alter company to improve the performance of the system.