Abstract
Cross-eye jamming is an angular deception jamming technique against monopulse radar. Multiple-element retrodirective cross-eye jamming (MRCJ) as an improved method, uses a retrodirective antenna array with multiple antenna elements in a cross-eye jammer and can obtain better jamming performance. However, the practical MRCJ system employing a linear antenna array becomes ineffective when the threat radar appears in the antenna array’s end-fire direction. To meet multiple threats from different directions and provide continuous jamming, MRCJ employing a circular antenna array (C-MRCJ) is proposed after defining the modulation direction of system parameters. Optimal configuration of C-MRCJ providing stable jamming performance is discussed. The number of the jammer loops is analyzed under considerable jamming performance and moderate hardware cost.
Highlights
Cross-eye jamming is an electronic countermeasure (ECM) technique which deceives the monopulse radar with a significant angular error
To provide continuous cross-eye jamming, we further propose a modified C-Multiple-element retrodirective cross-eye jamming (MRCJ) based on a priori information of Direction Of Arrival (DOA) of radar waves by defining the modulation direction (MD) of jammer loops
C-MRCJ and L-MRCJ is that the factor affecting the value of cross-eye gain is not the same, which is the ratio of base-lengths of jammer loops for L-MRCJ and is the angular separations between the jammer loops for C-MRCJ
Summary
Cross-eye jamming is an electronic countermeasure (ECM) technique which deceives the monopulse radar with a significant angular error. The performance of a retrodirective cross-eye jamming system can induce an angular error into monopulse radar that even breaks the radar’s lock. To provide effective protection in whichever direction the potential threat signal transmits, the idea of using multiple independent jammer loops to cover a 360◦ angular region was mentioned naturally by Neri in [21], where a different single jammer loop is chosen to confront the threat from different directions This “switch” approach providing continuous jamming with a single jammer loop gives up the superiority of additional degrees of freedom and still suffers from the limitations associated with a two-element cross-eye jammer. To provide continuous cross-eye jamming, we further propose a modified C-MRCJ based on a priori information of Direction Of Arrival (DOA) of radar waves by defining the modulation direction (MD) of jammer loops. The other notations will be given in appropriate locations in the paper
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