An improved multiplication modulation deception jamming method for countering ISAR

Abstract This paper proposes a dechirping multiplication modulation jamming method for countering ISAR. The wideband linear frequency modulation (LFM) signal is converted into a single-tune signal after the dechirping and extraction process. We use the high resolution range profile (HRRP) of the target as the template and it is performed a fast Fourier transform to generate the modulation signal. Then the radar signal is multiplied by the modulation signal pulse by pulse to derive the baseband jamming signal. At last the jamming signal is conducted Chirp transform to derive the jamming signal in wideband formation. In contrast to the conventional convolution method, the proposed algorithm not only reduces the hardware complexity and computation load, but also exhibits a simply and flexible structure which can be implemented in FPGA. Both the simulation result and the measured data illuminate the validity of the proposed method.