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基于调制盘的红外制导导弹严重威胁战机的生存,需要开展机载红外对抗技术研究以保护战机的自身安全。以旭日升型调幅式调制盘为例,介绍了调制盘的工作原理,分析了中波红外激光干扰调制盘的机理,使用MATLAB模拟了不同幅度、频率、相位的调制脉冲信号对调制盘系统的干扰情况。结果表明:干扰光强度与目标辐射强度之比从1提高到10时,方位角误差由3.6°变为14.4°,失调角误差由2.4°变为10.8°。当干扰信号角频率与调制盘载波频率接近时,方位角误差变为151.2°,失调角误差变为28.4°。单纯增加干扰光的强度对实现干扰贡献不大,会增加调制盘系统接收信号的强度,易暴露目标。幅值缓变的干扰信号虽然能使调制盘导引头的接收信号出现偏差,但不会让目标完全摆脱导弹跟踪,而角频率接近载波频率的干扰信号会使导引头接收不到准确信号,最终实现干扰。
Infrared-guided missiles based on modulating disks seriously threaten the survival of fighter aircraft, and the research on airborne infrared countermeasure technology needs to be carried out to protect the fighter’s own safety. This paper introduces the working principle of modulating disk and analyzes the mechanism of interfering modulating disk with medium-wavelength infrared laser. Using MATLAB to simulate the modulation pulse signals of different amplitude, frequency and phase, Interference situation. The results show that when the ratio of disturbance light intensity to target radiation intensity increases from 1 to 10, the azimuth error changes from 3.6 ° to 14.4 ° and the misalignment angle error changes from 2.4 ° to 10.8 °. When the interfering signal angular frequency is close to the modulating disk carrier frequency, the azimuth error becomes 151.2 ° and the misalignment angle error becomes 28.4 °. Simply increase the intensity of interference light to achieve little contribution to interference, will increase the intensity modulation dish system receives the signal, easy to expose the target. Although the amplitude of the distorted signal interference modulation disk seeker received signal deviation, but will not let the target completely get rid of the missile tracking, and the corner frequency interference signal near the carrier frequency will seeker can not receive the exact signal , The ultimate realization of interference.