Fast Generation of Deceptive Jamming Signal Against Space-Borne SAR

Due to advantages, such as its low power consumption and higher concealment, deceptive jamming against the space-borne synthetic aperture radar has received extensive attention during the past decades. To reduce the computational complexity in the deceptive jamming operation, this article proposes a new approach to generate the jamming signal efficiently. Based on the Taylor series expansion and approximation, we derive the recursive formula, which can be used to calculate the current system function of jammer (JSF) from that in the previous pulse repetition interval. After the calculation of the initial JSF, the deceptive jamming signal can be quickly generated through the recursive algorithm. Then the validity and effective region of the algorithm is estimated through the theoretical analysis of the slant distance error. Finally, the simulation results confirm the superior effect of the proposed algorithm. Compared with the segmented modulation algorithm, the most commonly used fast algorithm for deceptive jamming, this algorithm improves the focusing performance slightly, while reducing the computational complexity by at least 6.25%.