| 摘要: |
| 逆合成孔径雷达（Inverse Synthetic Aperture Radar，ISAR）的方位定标可确定空间目标横向尺寸，有利于目标几何特征提取与图像解译。该文提出一种基于成像投影的空间目标ISAR方位定标方法。首先，该方法对回波进行高质量运动补偿与图像增强处理以增强成像显示效果。然后，从ISAR成像原理出发，基于视线信息计算得到投影向量并确定成像平面。最后，将增强处理后的ISAR图像反投影至成像平面网格，从而实现方位定标并得到成像投影几何关系。相比于现有方位定标方法，所提方法避免了复杂的信号参数估计，因此方位定标精度不受回波信噪比影响。同时，该方法提供了成像投影几何关系，基于单次观测能生成多视角目标ISAR图像，有助于空间任务辅助决策。仿真数据实验对比验证了该方法的有效性和稳健性。 |
| 关键词: 逆合成孔径雷达 方位定标 成像平面 成像投影 |
| DOI： |
| 分类号:TN957 |
| 基金项目:无 |
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| A Novel ISAR Cross-Range Scaling Method for Space Target Based on Imaging Projection |
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| Abstract: |
| Inverse Synthetic Aperture Radar (ISAR) cross-range scaling can determine the azimuth size of space target, which is beneficial to target geometric feature extraction and image interpretation. In this paper, a novel ISAR cross-range scaling method for space target based on imaging projection is proposed. Firstly, the ISAR echo is processed with high quality motion compensation and image enhancement to enhance the image display effect. Then, based on the principle of ISAR imaging, the projection vector is calculated by using the line-of-sight (LOS) information and the imaging plane is determined. Finally, the enhanced ISAR image is back-projected to the imaging plane grid, so as to realize cross-range scaling and obtain the imaging projection geometric relationship. Compared with the available cross-range scaling methods, the proposed method avoids complex signal parameter estimation, so the accuracy of cross-range scaling is not affected by the echo signal-to-noise ratio (SNR). At the same time, the proposed method provides the geometric relationship of imaging projection, and can generate ISAR images of multi-view targets based on single observation, which is helpful for space mission assistant decision-making. The effectiveness and robustness of the proposed method are verified by simulation data. |
| Key words: inverse synthetic aperture radar imaging cross-range scaling image plane imaging projection |