An Improved Digital False-Target Image Synthesizer Method for Countering Inverse Synthetic Aperture Radar

Abstract

Digital false-target image synthesizer (DIS) has been proposed as a deceptive jamming method for countering inverse synthetic aperture radar (ISAR) with an RF imaging false-target capability. However, to efficiently generate jamming signal in real time, a specific-designed generator is unavoidable for the implementation of this algorithm, where parallel and pipeline processing are both included because jamming signal is generated according to each range bin. This paper proposes an improved two-stage DIS method (T-DIS). The implementation of the T-DIS can be effectively simplified by separating the modulation process of a repeat jammer into two stages: the offline stage and the real-time stage. The modulation signal can be easily extracted from the modulation-matrix buffered in the offline stage. Only an element-by-element matrix multiplication between the modulation signal and the intercepted ISAR signal is needed in the real-time stage. In contrast to the conventional DIS method, the proposed algorithm exhibits simplicity and flexibility significantly, which reduces the computation time and hardware constraints. Experimental results of scattering model of the Yak-42 plane and real data illuminate the validity of the proposed method.