SAR移频欺骗干扰距离主瓣展宽问题解决方法

doi:10.12305/j.issn.1001-506X.2026.04.08

Abstract

Abstract:

In large-scene jamming scenarios, due to the bandwidth limitations of SAR processing, wide-range frequency shifts can result in bandwidth loss in the jamming signal, leading to range mainlobe broadening, degradation of false target imaging quality and reduced fidelity of deception jamming. This broadening also causes variations in imaging quality with respect to frequency offset, reducing the fidelity of the jamming. To enhance the fidelity of large-scene frequency-shift deception jamming, this paper proposes a bandwidth extrapolation method based on signal extension, addressing the range mainlobe broadening caused by frequency shift. Firstly, the jammer obtains the intermediate-frequency (IF) signal using a dechirp reception method. Then, a Kalman predictive filter is designed to extend the IF signal in the time domain. Next, the extended IF signal undergoes frequency-shift modulation. Finally, up-conversion generates the bandwidth-extrapolated jamming signal. Simulation results demonstrate that the proposed method significantly improves the range resolution of false point targets with large range offset and the imaging quality of false scenes, thereby effectively resolving the range mainlobe broadening issue in SAR frequency-shift deception jamming.

Key words: synthetic aperture radar (SAR), frequency-shift deception jamming, range mainlobe broadening, bandwidth extrapolation, signal extension, Kalman predictive filter

CLC Number:

TN 957.5

Tianyou HUANG, Huifu LIN, Chao YANG, Tao LAI, Qingsong WANG, Haifeng HUANG. A method for resolving range mainlobe broadening in SAR frequency-shift deception jamming[J]. Systems Engineering and Electronics, 2026, 48(4): 1174-1185.

Figures/Tables 20

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References 30

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参数	数值
载频/GHz	9.6
带宽/MHz	50
脉宽/μs	20
距离向处理带宽/MHz	60
脉冲重复频率/Hz	3509
斜距/km	500
天线孔径/m	6
天线主瓣宽度/rad	0.0052

SNR/dB	PSLR/dB	ISLR/dB	IRW/m
未作处理	−12.755	−3.336	7.001
−10 dB	−12.779	−3.353	7.009
10 dB	−15.144	−11.434	3.581
30 dB	−12.785	−10.260	3.280

误差	PSLR/dB	ISLR/dB	IRW/m
未作处理	−12.755	−3.336	7.001
初始状态无误差	−12.785	−10.260	3.280
初始状态10%误差	−12.777	−10.277	3.282
初始状态20%误差	−12.770	−10.271	3.282

误差	PSLR/dB	ISLR/dB	IRW/m
无误差	−12.785	−10.260	3.280
相位差$ {\text{π}} /4 $	−9.990	−8.727	3.254
相位差$ {\text{π}} /2 $	−6.462	−5.472	3.163

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A method for resolving range mainlobe broadening in SAR frequency-shift deception jamming

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