Shape estimation of space debris using single-range Doppler interferometry
Shape estimation of space debris using single-range Doppler interferometry
复制标题
DOI：
10.1109/36.752218
复制
发表时间：
1999-03-01
影响因子：
8.2
通讯作者：
Sato, T
中科院分区：
文献类型：
--
作者：
Sato, T
地球轨道上留下的卫星和火箭物体的空间碎片碎片的形状估计 - 是评估碎屑与操作航天器碰撞的可能性的重要任务。提出了一种方法，用于成像大小小于雷达的范围分辨率的空间碎片，它称为单范围多普勒干涉法（SRDI），与常规多普勒干涉法相比，它重建了二维（2-D）图像根据高范围分辨率和多普勒分辨率，提出的方法利用了空间碎片通常遵循其主要旋转运动的事实轴。可以通过在一个自旋期间迁移多普勒频谱图来获得目标的二维图像。通过数值模拟对所提出的SRDI方法的特征进行了检查，对于由孤立的各向同性散射中心组成的靶标，可以以一半的雷达波长的分辨率重建一个清晰的图像，这等同于常规RDI（或ISAR）（或ISAR） ）仅当雷达的范围分辨率比目标的大小好得多时才适用。从导电主体获得的图像以相应的主要反射为主导，尽管可以大致估算身体的大小。
Shape estimation of space debris-fragments of satellites and rocket bodies left in earth's orbit-is an important task in evaluating the possibility of debris colliding with operational spacecraft. A method is proposed for imaging space debris whose size is smaller than the range resolution of the radar, It is called single range doppler interferometry (SRDI) in contrast to the conventional Doppler interferometry, which reconstructs the two-dimensional (2-D) image based on high range resolution as well as Doppler resolution, The proposed method makes use of the fact that space debris usually follows a simple spin motion around its major axis. A 2-D image of a target can be obtained by migrating the Doppler spectrogram over one spin period. The characteristics of the proposed SRDI method are examined by means of numerical simulation, For targets that consists of isolated isotropic scattering centers, a clear image can be reconstructed with a resolution of half the radar wavelength, which is equivalent to the conventional RDI (or ISAR) technique that is applicable only when the range resolution of the radar is much finer than the size of the target. The image obtained from a conductive body is dominated by strong scattering centers with corresponding major reflections, although the size of the body could be roughly estimated.