A 2D radar imaging method of space debris based on Doppler information
A 2D radar imaging method of space debris based on Doppler information
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DOI：
10.1117/12.658367
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发表时间：
2005-11
期刊：
影响因子：
--
通讯作者：
Hui Tang;Weidong Hu;Wenxian Yu
中科院分区：
文献类型：
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作者：
Hui Tang;Weidong Hu;Wenxian Yu
空间碎片的形状和尺寸估计是空间碎片观测的一个重要问题。一般来说，空间碎片是长长的，并遵循绕主轴的简单滚动旋转运动。本文利用其自身的形状和运动特点，提出了一种利用低分辨率雷达对空间小碎片进行二维雷达成像的方法。该方法利用时频分析技术获得目标上所有散射中心的时瞬时多普勒分布，然后根据方位角重新排列分布，得到目标的横向-方位角分布，最后重新分配横向-方位角分布中各点的功率，获得目标图像。进一步分析了参考中心相对雷达匀加速运动对成像的影响，并提出了相应的解决方案。仿真结果验证了该方法的有效性，目标图像具有近似波长的分辨率。
Shape and size estimation of space debris is an important issue of space debris observation. Generally speaking, space debris is prolate, and follows a simple roll rotation motion around the major axis. In virtue of its own shape and motion features, a two-dimensional radar imaging method of small space debris employing low resolution radar is proposed in this paper. The method recurs to time-frequency analysis technology to obtain the time-instantaneous Doppler distribution of all Scattering centers on the target, and then rearranges the distribution according to aspect angles to acquire target's cross range-aspect angle distribution, and finally reassigns respective points' power in the cross range-aspect angle distribution to gain target image. Furthermore, the paper analyzes the impact of reference center's uniform accelerated motion relative to radar on imaging, and presents corresponding solutions. Simulation results reveal the validity of the method, and target image has a resolution of approximate wave length.