A study on blanket noise jamming to LFM pulse compression radar

A blanket noise jamming method based on sawtooth wave frequency shift is proposed in this paper. The characteristic of the jamming signal is analyzed in detail in frequency domain. Due to the frequency modulation, the modulated signal is dis-matched with the matched filter and the output signal's pulse width spreads. The periodic sawtooth wave determines the bandwidth of the jamming signal and the pseudo-random sequence is used to create dense noise signals. After processed by the matched filter, the jamming signal forms a rectangular blanket covering span. The amplitude of the jamming signal's main peak varies slightly and effectively raises the radar detection threshold. The simulation results validate the correctness and effectiveness of the proposed method. When the chirp rate of the LFM signal is large, the proposed method behaves better than the pseudo-random sequence modulation method and other non-coherent noise jamming methods.