脉间捷变频SAR快速补偿频域成像处理算法

打开文本图片集

中图分类号： TN974 文献标志码：A DOI：10.12305/j.issn.1001-506X.2025.03.12

Fast compensation frequency-domain imaging processing algorithm for inter-pules frequency agility SAR

CHEN Shilong1，²，LIU Lin1，2，*，WANG Xiaobei1 ，ZENG Hansen1，²，LIU Yabo 1，2 ，LIU Xiangl （1.Aerospace Information Research Institute，Chinese Academy of Sciences，Beijing 10oo94，China; 2．School of Electronic，Electrical and Communication Engineering，University of ChineseAcademyofSciences，Beijing10oo49，China）

Abstract：Synthetic aperture radar （SAR）inter-pulse carrer frequency agility technology actively increases thecomplexityand uncertainty of radar waveforms byrandomly varying the signalcarrier frequency between pulses，effectively countering active deception interference.However，frequency agility between pulses can introduce Doppler frequency modulationagility，resulting in the inabilityto compress in theazimuth direction.To addressthis，a rapid compensation frequency-domain imaging processing approach is proposed.By considering the changes in phase history between pulses and the characteristics of intra-pulse linear frequency modulation，phase spatial variation with range after range pulse compresson is avoided. It achieves rapid imaging while suppressing range sidelobes and enhancing the detection of weak targets by accurately compensating the main lobe and approximately compensating the sidelobes in the range direction.The computational complexity of this scheme is comparable to traditional fixed waveform SAR imaging. Simulation data processing demonstrates the effectivenessand anti-interference performanceof this approach by obtaining imaging results for point and area targets under active deception interference.Furthermore，the proposed processing scheme efectively improves the peak sidelobe ratio and integrated sidelobe ratio of point targets by 12dB and 10dB ，respectively，compared to traditional fixed waveform processing.

Keywords：synthetic aperture radar（SAR）；anti-interference；inter-pulse frequency agile signal； frequency domain imaging；active deception interference

0 引言

合成孔径雷达（syntheticapertureradar，SAR）作为现代侦察的重要手段，在电子对抗中被广泛应用。（剩余15279字）