| With the fast development of the electronic jamming, the security and reliability of the communication-link is meeting with a big challenge, and then it requires higher anti-jamming performance of missile. The jamming is the contrary of the anti-jamming as well as the spear and the shield. To improve the performance of anti-jamming, it should be deeply researched on the communication jamming system. With the project"Research on estimation of anti-jamming performance in'human-in-the-loop'data link for the guidance systems based on image", the typical communication jamming system is researched and simulated in this paper, which includes analysis of anti-jamming performance of different communication systems, mainly discusses the effect of jamming on transformation link for image and instruction.There are two ways to jam the transmission of the information. One is to jam on the information layer, calling Blanket Jamming, which is to destroy the structure of the signal and reduces the SNR, and the other is on the single layer, calling deception jamming, which provides mendacious information to disturb the receiver. It is mainly researched about the principle of monochromatic interference, multi-frequency interference, narrowband interference and frequency-swept interference and how to produce these interference signals based on researching on jamming of amplitude modulation, jamming of frequency modulation and pseudo noise sequences modulation. And all ways mentioned above are simulated based on matlab.The effect evaluation of all kinds of the jamming is also analyzed in the paper. When discuss the effect of the jamming, the parameter discussed should be paid more attention to. That the value of the power or the value of the density of the power compared is important. For example,to the direct-sequence spread-spectrum (DSSS) communication system, the broadband jamming will not get a better effect than the narrowband jamming with the equal value of power. |
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