Abstract: A new method is proposed for jamming the linear frequency modulation (LFM) radar, which is based on the feature of the LFM radar signals and is named weighted frequency modulated jamming. The jammer receives the radar signal and modulates it in the frequency domain. Then the modulated signal is retransmitted. It can produce false targets deceptive jamming or cover jamming according to the modulating parameters. This technique requires lower jamming power. Theoretical analysis and computer simulation justify the validity and efficiency of the new jamming technique.

Key words: electronic countermeasures, weighted frequency modulated jamming, LFM signals, sawtooth FM, false target deceptive jamming