脉间捷变频SAR快速补偿频域成像处理算法

doi:10.12305/j.issn.1001-506X.2025.03.12

Abstract

Abstract:

Synthetic aperture radar (SAR) inter-pulse carrier frequency agility technology actively increases the complexity and uncertainty of radar waveforms by randomly varying the signal carrier frequency between pulses, effectively countering active deception interference. However, frequency agility between pulses can introduce Doppler frequency modulation agility, resulting in the inability to compress in the azimuth direction. To address this, 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 compression 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 effectiveness and anti-interference performance of this approach by obtaining imaging results for point and area targets under active deception interference. Furthermore, the proposed processing scheme effectively improves the peak sidelobe ratio and integrated sidelobe ratio of point targets by 12 dB and 10 dB, respectively, compared to traditional fixed waveform processing.

Key words: synthetic aperture radar (SAR), anti-interference, inter-pulse frequency agile signal, frequency-domain imaging, active deception interference

CLC Number:

TN974

Shilong CHEN, Lin LIU, Xiaobei WANG, Hansen ZENG, Yabo LIU, Xiang LIU. Fast compensation frequency-domain imaging processing algorithm for inter-pules frequency agility SAR[J]. Systems Engineering and Electronics, 2025, 47(3): 797-806.

Figures/Tables 20

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参数	值	参数	值
信号载频f_c/GHz	5.4	平台高度H/m	2 000
捷变带宽Δf/MHz	200	移动速度V/(m/s)	100
信号脉宽T_p/μs	4	天线长度D/m	1.2
带宽B_W/MHz	200	重复频率PRF/Hz	1 000
入射角R_a/(°)	45	斜视角S_a/(°)	0
方位采样点	1 024	距离采样点	2 048

算法及捷变范围	峰值旁瓣比	积分旁瓣比
RD-0 MHz	-12.78	-9.77
BP-0 MHz	-13.94	-10.77
RD-200 MHz	-25.86	-21.90
BP-200 MHz	-15.36	-16.28

算法及捷变范围	峰值旁瓣比	积分旁瓣比
RD-0 MHz	-13.58	-10.24
BP-0 MHz	-15.08	-11.40
RD-200 MHz	-13.57	-9.52
BP-200 MHz	-14.88	-5.22

捷变频调频范围/MHz	峰值旁瓣比		积分旁瓣比
捷变频调频范围/MHz	距离向	方位向	距离向	方位向
20	-13.04	-13.61	-11.19	-10.35
300	-20.54	-14.50	-15.38	-9.32
400	-15.21	-16.07	-10.29	-8.59
600	-15.21	-15.60	-10.40	-8.36
800	-16.61	-13.95	-10.88	-7.50

算法	二阶熵/dB			平均用时/s
算法	船舶	飞机	码头	平均用时/s
LFM_(RD)	7.020 7	6.323 8	9.540 4	2.35
FA-LFM_(RD)	6.974 1	6.037 6	9.509 2	2.59
FA-LFM_(BP)	6.598 0	5.727 5	9.214 2 dB	51.91

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

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