Broadband Repeat Jamming of Monopulse Receivers in Missile Borne Tracking Radar
نویسنده
چکیده
Jamming of radar guided missile receivers are extremely difficult as the frequency lock and the servo lock requires no deviations in the repeater waveform of the jammer and its frequency. Broadband repeat jamming of such missile radar receiver is illustrated in this paper for effective deception in the presence of FM CW (Continuous Wave) interference signal. The modulation index of the FM jammer required for breaking the frequency lock of the monopulse receiver is determined and its variation with radar echo signal amplitude is presented. It is shown that modulation index required for jamming the receiver increases with increase in amplitude of the received radar echo. It is also verified that for particular radar echo amplitude, less modulation index is required for jamming the receiver when the modulating voltage in the FM jammer is maintained at large value. It is seen that break-lock in the receiver occurs when the FM modulation index is 8.75x10 or more for typical radar echo amplitude of 1 volt and FM modulating voltage of 5 mV and frequency of 0.2 MHz. The effectiveness of the jamming is estimated through computer simulation using Visual System Simulator.
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Estimation of Break-Lock Conditions for Effective Jamming in Missile Borne Monopulse Receivers
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