上海航天（中英文）2024，Vol.41Issue(3)：176-186,11.DOI:10.19328/j.cnki.2096-8655.2024.03.019
天基逆合成孔径雷达脉内脉间运动补偿及高分辨成像
Intra-pulse and Inter-pulse Motion Compensation for High-resolution Space-borne Inverse Synthetic Aperture Radar Imaging
摘要
Abstract
In recent years,space situation awareness has garnered increasing attention in both military and civilian fields.Space-borne inverse synthetic aperture radar(SBISAR)is an important tool for space situational awareness.It enables high-resolution imaging of space targets,and supports subsequent tasks such as component extraction,posture estimation,and type identification.However,in SBISAR imaging scenarios,complex and non-uniform high-speed relative motion exists between the platform and the space maneuvering targets,rendering traditional range-Doppler(RD)imaging methods ineffective.Therefore,motion compensation should be considered.In this paper,two typical motion errors are discussed,i.e.,the failure of the traditional"stop-go-stop"model under high radial velocities and the inconsistent target rotation speeds within long coherent processing intervals(CPIs),and a specific algorithm is designed for intra-pulse and inter-pulse motion compensation.First,a signal model for SBISAR imaging is established.Then,based on the minimum entropy criterion,a parameter estimation cost function is constructed to estimate the chirp rate of the echo signal,and the obtained estimation is used to construct a compensation term for intra-pulse motion compensation.Similarly,an image entropy cost function is established to estimate the rotational parameters,achieving spatial-variant phase compensation for rotational motion.The proposed algorithm can effectively address the range extension and azimuth defocusing issues by traditional RD imaging algorithms in the case of high-speed maneuvering,and enables the high-resolution imaging of space targets by SBISAR.Through the experimental analysis based on the simulation data,the effectiveness of the proposed algorithm is validated.关键词
天基逆合成孔径雷达(SBISAR)/脉内运动/机动目标/运动补偿/最小熵Key words
space-borne inverse synthetic aperture radar(SBISAR)/intra-pulse translation/maneuvering target/motion compensation/minimum entropy分类
信息技术与安全科学引用本文复制引用
江利中,罗怡宁,张邦杰,徐刚,肖磊..天基逆合成孔径雷达脉内脉间运动补偿及高分辨成像[J].上海航天（中英文）,2024,41(3):176-186,11.基金项目
国家自然科学基金(62071113) （62071113）
