| Based on the RF signal processor and Graphics language - LabVIEW, cw radio fuse recognition and simulative jamming technology are introduced in this paper. The work of this paper provide a reference for laboratory to study the jamming and anti-jamming of fuse. According to the principle of simulative jamming experiment, the structure of this paper is as follows:(1) Interception of the fuse signal. Based on the NI RF signal receiving module, the center frequency and the bandwidth of the fuse signal are acquired by the method of searching receiver. And then the signal is down converted to fixed interim frequency and digitally processed and so on. All those are prepared for the follow-up recognition and jamming of signal.(2) Recognition of the modulation type. Based on decision-making theory, a automatic modulation recognition module is established by LabVIEW to accomplish a recognition of the signals which include DSB, FM, 2ASK, 2FSK, 2PSK, LFM(Liner-frequency modulation) and PRCPM(pseudo random code phase modulation).(3) Extraction of feature parameter. The demodulation and parameter recognition of LFM and PRCPM signals are studied based on the right signal recognition. The LFM signal is demodulated by the method of the orthogonal demodulation, the modulation parameters such as the frequency offset, the modulation signal cycle are acquired. The PRCPM signal is demodulated by the method of the correlation demodulation, based on the PN code's feature parameters extraction algorithm of m-sequence properties, the cycle and the pseudo-code sequence are acquired.(4) Production of the jamming signal. Deceiving jamming and suppressing jamming are discussed and the jamming results are acquired. For the deceiving jamming, reconstructed modulation signal is cycle delayed as a jamming signal, For the suppressing jamming, jamming waveform database is established. From the established database jamming waveform is chose and jamming parameters are set to jam the fuse. |
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