Journal
IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS
Volume 59, Issue 4, Pages 3588-3605Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAES.2022.3228513
Keywords
Jamming; Synthetic aperture radar; Time-frequency analysis; Radar polarimetry; Radar imaging; Phase modulation; Microwave filters; Barrage jamming; deceptive jamming; multiple phases sectionalized modulation (MPSM); nonlinear frequency-modulated (NLFM) signal; synthetic aperture radar (SAR)
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In this article, a new jamming method against synthetic aperture radar (SAR) based on the nonlinear frequency-modulated (NLFM) signal is proposed. Compared with the traditional linear frequency-modulated (LFM) signal, the NLFM signal has a time-frequency structure that mismatched with the linear matched filter of SAR, resulting in a stronger and more flexible jamming effect.
The traditional methods of jamming against synthetic aperture radar (SAR), which are implemented based on linear frequency-modulated (LFM) signals, are currently unable to meet the needs of electronic countermeasures. Compared with the LFM signal, the frequency of the nonlinear frequency-modulated (NLFM) signal varies nonlinearly with time. Because of this time-frequency structure, the NLFM signal is naturally mismatched with the linear matched filter of SAR; thus, a stronger and more flexible jamming effect is produced. In this article, the NLFM signal is used in the SAR jamming field for the first time, and a smart jamming method against SAR based on the NLFM signal is proposed, which can produce the following two jamming effects: barrage and deceptive. First, the shaping factor is defined to generate the expected NLFM signal. The shaping factor controls the jamming range in the fast time direction for barrage jamming. For deceptive jamming, a jamming method involving piecewise weighting is proposed. The shaping factor is used to control the defocusing degree of false targets. Subsequently, the pulse compression results of the jamming signal are deduced, and the influence of different parameters on the jamming effect is theoretically analyzed. Experimental results based on simulation show that the method can control the jamming range and effect in the fast time direction while achieving a flexible deceptive jamming effect.
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