机动平台大斜视压缩感知SAR成像方法

doi:10.3969/j.issn.1001-506X.2020.10.07

Abstract

Abstract:

To reduce the data volume of the synthetic aperture radar (SAR) imaging system and improve its platform adaptability, a novel frequency-domain approximated observation based high-squint compressed sensing SAR imaging method mounted on maneuvering platforms is proposed. First, a slant range model based on the equal-squint-angle curve is constructed to accurately describe the spatial variability of imaging parameters for the ground scattering point. Then, the range-azimuth decoupling and the spatial-variant range cell migration correcting are realized by introducing the range walk correction function and the high-order time-domain disturbance factor, and the spatial variability of the azimuth compression parameters is corrected by constructing the phase filtering factors in the time and frequency domains. Finally, the complex approximation message passing (CAMP) algorithm is used to obtain fast and high-precision reconstruction of the sparse and non-sparse scene. This method improves the precision of the approximated observation operator by correcting the spatial variability of the imaging parameter, and achieves the high-squint compressed sensing SAR imaging of the extended scene on maneuvering platform. The simulation results support the theoretical analysis and illustrate the effectiveness of the proposed method.

Key words: synthetic aperture radar (SAR) imaging, compressed sensing, maneuvering platform, high-squint

CLC Number:

TN957

Yanheng MA, Gen LI, Xuying XIONG, Jianqiang HOU. High-squint compressed sensing SAR imaging mounted on maneuvering platform[J]. Systems Engineering and Electronics, 2020, 42(10): 2197-2206.

Figures/Tables 13

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References 21

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仿真参数	取值
载频/GHz	17
距离带宽/MHz	200
合成孔径时间/s	3
脉冲宽度/μs	5
脉冲重复频率/kHz	1.5
斜视角/(°)	60
平台高度/km	4
中心斜距/km	13
速度/(m/s)	(150, 0, -35)
加速度/(m/s²)	(2.2, 1.2, -0.8)

采样率	成像方法	IRW	PSLR/dB	ISLR/dB
1	PIO-MF-SAR	5.48	-13.24	-9.83
	PIO-SR-SAR	4.93	-22.01	-23.68
	PIO-NSR-SAR	5.21	-16.81	-14.11
0.25	PIO-MF-SAR	5.46	-13.44	-6.58
	PIO-SR-SAR	4.90	-22.41	-24.44
	PIO-NSR-SAR	5.08	-18.71	-17.52
0.09	PIO-MF-SAR	5.45	-13.04	-4.16
	PIO-SR-SAR	4.88	-22.48	-24.93
	PIO-NSR-SAR	4.98	-20.35	-19.27

成像方法	点目标	IRW	PSLR/dB	ISLR/dB
PIO-MF-SAR	3	6.24	-12.90	-10.3
	5	5.48	-13.24	-9.86
	7	4.68	-13.01	-10.23
RIO-MF-SAR	3	15.21	-0.84	-1.48
	5	5.48	-13.24	-9.86
	7	5.21	-7.06	-7.37

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High-squint compressed sensing SAR imaging mounted on maneuvering platform

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