机载长合成孔径时间海面运动舰船高分辨SAR成像算法

doi:10.12305/j.issn.1001-506X.2026.02.08

Abstract

Abstract:

In order to solve the problem of low imaging resolution of inverse synthetic aperture radar （ISAR） due to insufficient rotational components, and synthetic aperture radar （SAR） imaging defocusing caused by non-cooperative motion for maritime moving ship, a high-resolution SAR imaging algorithm is proposed for maritime moving ships with long synthetic aperture time. Firstly, ship target detection and signal separation are completed based on the sub-aperture imaging. Then, range and Doppler adaptive correlation search between sub-apertures are used to achieve signal collection. During the ship signal collection process, range alignment and translation error compensation are synchronously applied. Finally, the matched Fourier transform based method is used to estimate moving ship rotation parameters, achieve rotation error supplementation, and complete high-resolution SAR imaging of long synthetic aperture time ship targets. Experimental results and comparative analysis demonstrate that the proposed method achieves high-resolution imaging of moving ships on the sea surface, effectively focusing point targets. Compared with conventional methods, the scattering point details of ship targets are significantly richer, verifying the effectiveness of the proposed method.

Key words: ship imaging, long synthetic aperture time, target detection and signal extraction, target signal collection, match Fourier transform, sub-aperture

CLC Number:

Kai CHEN, Yongbo ZHAO, Rengli LIU, Haitao DENG, Long SUN. High resolution SAR imaging algorithm for maritime moving ships with airborne long synthetic aperture time[J]. Systems Engineering and Electronics, 2026, 48(2): 456-465.

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参数	数值
载频/GHz	10
带宽/MHz	400
采样率/MHz	480
脉宽/μs	10
PRF/Hz	400
平台速度/（m/s）	50
飞行高度/m	4000
中心作用距离/km	50
方位向3 dB波束宽度/（°）	2.5

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High resolution SAR imaging algorithm for maritime moving ships with airborne long synthetic aperture time

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