Abstract
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%.
Highlights
S YNTHETIC aperture radar (SAR) is an effective way for high-resolution imaging
Because the JSF is derived by the analysis of ΔRx,y(ta), i.e., the slant distance difference between the jammer and the fake scatterer, which is independent of the operational mode, the algorithm can be applied to almost SAR operational modes, including stripmap, spotlight, scanning, and even TOPS
We assume the total number of pulses received during the jamming process is N, according to the SAR imaging principle, RCMres is about the slant distance error after RCM correction (RCMC)
Summary
S YNTHETIC aperture radar (SAR) is an effective way for high-resolution imaging. Unlike the traditional optical remote sensing methods, SAR has the ability to penetrate camouflage and perform high-resolution earth observation under complex weather conditions at all-time [1]. YANG et al.: FAST GENERATION OF DECEPTIVE JAMMING SIGNAL AGAINST SPACE-BORNE SAR [14]–[16], and approach of multiple receivers [17], [18], etc., reduces the computational complexity by approximating the distance equation, which will cause the loss of imaging quality to a certain extent The latter, including the inverse Omega-K algorithm [19], frequency-domain premodulation [20], frequencydomain three-stage algorithm [21], etc., needs to perform 2-D Fourier transform and Stolt interpolation on the template, which is relatively precise but has obstacles in practicality due to some defects, such as the additional requirement for the azimuth bandwidth parameters and the determination of the azimuth time, etc.
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