分布式小卫星MIMO-SAR超高分辨成像方法

doi:10.19665/j.issn1001-2400.2021.02.013

Abstract

Abstract:

Aiming at the spotlight mode of the distributed small satellite multiple-input multiple-output synthetic aperture radar(MIMO-SAR),an ultra-high resolution imaging method is proposed to reduce the storage pressure and imaging load of the satellite in a multi-channel high-resolution mode.The full-aperture signal of each channel is divided into sub-aperture signals.The sub-aperture signal is deblurred,and then the large bandwidth signal is obtained by using the improved time domain bandwidth synthesis method.Then the sub-aperture image coherent fusion algorithm is used to obtain the ultra-high resolution image.Simulation results show that the improved time domain bandwidth synthesis method can synthesize bandwidth effectively,and the imaging effect of the proposed method is excellent.The validity and reliability of the method are verified.

Key words: synthetic aperture radar, small satellite, multiple input multiple output, spotlight, sub-aperture

CLC Number:

TN957

YANG Jun,ZHOU Fang. Ultra-high resolution imaging method for the distributed small satellite MIMO-SAR[J].Journal of Xidian University, 2021, 48(2): 99-108.

Figures/Tables 13

References 20

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参数	值	参数	值	参数	值
卫星个数	3	步进频率/MHz	500	子孔径个数	8
平台速度/(m·s^-1)	7 391	脉冲重复频率/MHz	5 000	中心频率/GHz	9.6
场景中心距/km	617	信号带宽/MHz	500	方位基线距离/m	500

点目标	距离向		方位向
点目标	峰值旁瓣比	积分旁瓣比	峰值旁瓣比	积分旁瓣比
P₁	-13.60	-10.35	-13.23	-9.87
P₂	-13.61	-10.37	-13.23	-9.77
P₃	-13.33	-9.75	-13.88	-10.71

Ultra-high resolution imaging method for the distributed small satellite MIMO-SAR

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