Jamming of the amplitude modulation infrared seekers

The threat of the IR guidance missile is a direct consequence of extensive proliferation of the airborne IR countermeasure. According to the operation of the amplitude modulation reticle system, the principle of the laser disturbance on modulation reticle was analyzed and the numerical simulation used MATLAB based on a rising-sun reticle was done. When the ratio of jamming energy to target radiation increased from 1 to 10, the azimuth error changed from 3.6to 14.4 and the misalignment angle error changed from 2.4 to 10.8. When the jamming angular frequency was equal to the carrier frequency, the azimuth error was 151.2and the misalignment angle error was 28.4. The results show that simply increasing the intensity of the jamming light achieves little. It will increase the received signal strength of the amplitude modulation reticle system and the target will be more easily exposed. A slow variation of the amplitude will warp the azimuth information received by the seeker, but the target can't be completely out of the missile tracking. If the jamming signal's angular frequency is close to the carrier frequency of the reticle system, the seeker will can't receive an accurate signal and the jamming can be achieved.