雷达科学与技术2025，Vol.23Issue(5)：551-562,12.DOI:10.3969/j.issn.1672-2337.2025.05.009
基于相对速度的单通道机载聚束SAR动目标干扰抑制算法
Single-Channel Airborne Spotlight SAR Moving Target Interference Suppression Algorithm Based on Relative Velocity
摘要
Abstract
Airborne spotlight synthetic aperture radar(Spotlight SAR)is a high resolution imaging mode of SAR.The basic principle is to achieve decimeter-level high-resolution imaging by continuous observation of fixed areas.This high-resolution imaging has extremely important applications in military and civilian fields,especially in target interpre-tation and recognition.However,with the improvement of resolution,in the long-term observation process,the moving target in the observation area will produce longer and more complex defocus and offset signals.When these signals cover important objects such as urban buildings,the effect of image interpretation and target recognition will be significantly reduced.In view of the above problems,two methods of moving target interference suppression are proposed in this paper.The first method is to combine the relative velocity with the range Doppler algorithm(RDA),and adjust the rela-tive velocity parameters iteratively so that the defocused moving target can be refocused.In each iteration,the refocusing effect of the moving target is tested and judged by the maximum amplitude index.After the refocusing is completed,the refocused moving target is separated by the mask,and the original moving target echo signal is recovered by the inverse echo operation.Finally,by subtracting the recovered moving target echo from the original echo signal,the echo signal of the static scene can be obtained,and then the range Doppler algorithm is used to realize the imaging of the static scene.The second method is a moving target interference suppression method based on image sequence.The method obtains an image sequence by segmenting the sub-aperture,detects and generates a mask in the sub-aperture image sequence to re-move the defocusing moving target signal,and then accumulates the processed image sequence complex data to generate a high-resolution static scene image.In this paper,semi-physical synthetic data are used for experiments,and evaluated by correlation and coherence operations.The experimental results show that the first method can effectively separate the moving target from the static scene echo and the effect is better than the second method.关键词
相对速度/距离多普勒算法/动目标聚焦/回波分离Key words
relative velocity/range Doppler algorithm(RDA)/moving target focusing/echo separation分类
电子信息工程引用本文复制引用
申文杰,王佩悦,王彦平,林赟,李洋,白泽朝,蒋雯,赵新亚..基于相对速度的单通道机载聚束SAR动目标干扰抑制算法[J].雷达科学与技术,2025,23(5):551-562,12.基金项目
国家自然科学基金(No.62131001,62201011) （No.62131001,62201011）
国家重点研发青年科学家项目(No.2023YFB3905200) （No.2023YFB3905200）
北京市教委科研计划项目资助(No.KM202210009004) （No.KM202210009004）
北方工业大学毓秀创新项目资助(No.2024NCUTYXCX210) （No.2024NCUTYXCX210）
