In The Software Radio Frequency Hopping Jamming And Anti-jamming Waveform Design

Along with the development of frequency hopping interference and anti-interferencetechnology, the quality of frequency hopping communication is of utmost importance tomodern war. During modern information war, the first attacking target is to obtain andcontrol enemy’s information and to interfere with enemy’s communication. Therefore,information anti-interfere processing is an effective way for resisting enemy’sinformation jamming.This paper using a military digital frequency hopping station with frequency range of30MHz to88MHz, aims to conduct simulation analysis on audio interference, barragejamming, partial-band jamming and frequency domain notch suppression in frequencyhopping communication system. Then according to simulation and demand parametercomparison result, conduct a performance test of fixed frequency and SCAencapsulation on frequency hopping, then verified by C++language. This paper ismainly focused on the following three aspects:First, theoretical analysis and simulation on audio interference, follower jamming andbarrage jamming. This paper deduces for data channel and compensation channel,taking BFSK modulation. Under the circumstance of SNR of0dB,5dB and10dB,with AWGN channel and BFSK modulation, respectively conduct matlab simulation ondata-communication channel under the interference of single-tone jamming, multi-tonejamming, follower jamming and partial-band jamming.Second, theoretical analysis and simulation of frequency domain notch suppressionon frequency-hopping jamming. In the case of0dB SNR, frequency domain notchsuppression technology is used in simulation on single-tone jamming, multi-tonejamming, and partial-band jamming. And signal-to-jam ratio curves under notching infrequency domain are obtained. The bit error rate curve shows: for audio interference,the bit error rate reaches0.0441with notching in frequency domain,0.053higher thanthat of non-interference, which means that notching in frequency domain can get goodanti-jamming effect; for partial-band jamming, the bit error rate reaches0.1, and it is notsuitable for notching in frequency domain.Finally, component designing and testing. Specific as: waveforms offrequency-hopping jamming and anti-jamming, together with software component aredesigned, and applied factory is created; in the case of fixed frequency, waveform test isrespectively conducted under the circumstance of non-audio interference, audiointerference and frequency domain notch suppression; then complete C++languageverification for waveform component.The analysis result shows that utilizing the USDR software radio platform developedby National Key Laboratory of Science and Technology on Communications, toimplement the frequency hopping waveform development under SCA specification, the digital frequency-hopping voice communication between two SCA platforms can bewell realized. On USDR platform, frequency-hopping interference and anti-interferencemodule is of vital importance for customer to develop various waveform components, tofast handover for communication modes, and to realize configurable and portablefrequency hopping communication. In addition, its excellent anti-jamming performanceand confidentiality ensure its good adaptability both in military communication andcivil communication application.