摘要
微动是指目标或目标上某些部件沿雷达视线方向的小幅、非匀速运动。通过对微动目标进行逆合成孔径雷达(ISAR)高分辨3维成像,能够获得其结构和运动信息,从而为微动目标检测、跟踪、分类与识别提供重要依据,并在空间态势感知与防空反导中发挥着重要作用。由于微动目标运动形式复杂、回波非平稳性强,现有的参数化ISAR成像方法已经不再适用。针对该问题,该文提出基于散射中心航迹矩阵分解的微动目标高分辨3维成像方法。该方法首先生成距离-瞬时多普勒(RID)像序列,利用watershed图像分割方法提取RID像的散射中心支撑域,并基于最小欧氏距离准则实现航迹关联。然后,针对散射中心航迹关联时瞬时斜距估计精度受距离分辨率影响等问题,进一步提出基于现代谱估计的散射中心航迹矩阵精估计方法。最后,通过带约束的航迹矩阵分解实现微动目标的高分辨3维成像。仿真结果表明,该文所提的成像方法能够有效实现章动等复杂微动目标的高分辨3维成像。
Micromotion refers to the small and non-uniform motion of the target or several target components along the radar line of sight. Using the high-resolution three-Dimensional （3D） Inverse Synthetic Aperture Radar （ISAR） imaging, the structural information and motion status of micromotion targets can be obtained, providing essential features for the detection, tracking, identification, and classification, which play important roles in the space situation awareness and ballistic missile defense. Given the complex micromotion forms and the non-stationary radar echoes, the available parametric ISAR imaging methods are no longer applicable. To overcome this limitation, this study aims to propose a high-resolution 3D imaging method for micromotion targets based on the scattering center trajectory matrix decomposition. First, the Range Instantaneous Doppler （RID） image series is generated to extract the support region of scattering centers by the watershed method. Then, the scattering center association is achieved based on the minimum Euclidean distance criterion. Considering the insufficient accuracy in the instantaneous slant range estimation with limited range resolution, a method for refined estimation of the trajectory matrix based on the modern spectrum analysis is proposed. Finally, the high-resolution 3D imaging of the micromotion targets is obtained by the trajectorymatrix decomposition with constraints. The simulation results have demonstrated that the proposed method could effectively obtain high-resolution 3D imaging of the targets in complex micromotions such as nutation.
作者
惠叶
白雪茹
Hui Ye;Bai Xueru(National Laboratory of Radar Signal Processing,Xidian University,Xi＇an 7100711 China)
出处
《雷达学报（中英文）》
CSCD
北大核心
2018年第5期548-556,共9页
Journal of Radars
基金
国家自然科学基金(61631019
61522114)~~
关键词
逆合成孔径雷达(ISAR)
微动
3维成像
距离-瞬时多普勒(RID)像序列
航迹关联
Inverse Synthetic Aperture Radar （ISAR）
Micro-motion
Three-Dimensional （3D） imaging
Range- Instantaneous Doppler （RID） image series
Trajectory association
