Two-Dimensional Discretized Coherent Noise Jamming Method to Wideband LFM Radar

Abstract

Abstract-For coherent jammers to wideband linear frequency modulation (LFM) radar, the ratio between jamming energy and signal energy is always constant. To enhance the jamming to signal ratio (JSR), a two-dimensional (2D) discretized coherent noise jamming (2D-DCNJ) method is first proposed in this paper, where the covering area of the noise jamming results in 2D imaging is limited to a certain shape and further discretized to centralize the jamming energy. Moreover, the idea of weighting is applied to 2D-DCNJ to control the distribution of jamming energy, which can present some particular deceptive characteristics. The relationship between jamming results and modulated noise is analyzed, based on which the procedure of generating the jamming signal is detailed, and the JSR performance is compared with the previous ones. Finally, the validity of the proposed method is demonstrated via numerical simulation.

Analysis of Characteristics and Suppression Methods for Self-Defense Smart Noise Jamming

“…In recent years, with the development of digital radio frequency memory(DRFM) [4,5] technology, a jammer can rapidly intercept radar signals, modulate them, and forward them. For this reason, many new jamming styles have emerged, including shift-frequency jamming [6,7], interrupted sampling and repeater jamming (ISRJ) [8][9][10], and smart noise jamming [11][12][13][14][15][16]. The above-mentioned jamming methods are all coherent with radartransmitted signals and can obtain gain from matched filtering and pulse compression processing [17].…”