空间高速小尺寸碎片目标二维分集融合成像方法  

Two-dimensional diverse imaging method for high-speed space debris with small size

作　　者：宋大伟[1] 尚社[1] 李小军[1] 罗熹[1] 孙文锋[1] 范晓彦[1] 李栋[1] 

机构地区：[1]中国空间技术研究院西安分院空间微波技术国家级重点实验室,陕西西安710000

出　　处：《红外与激光工程》2016年第A02期71-76,共6页Infrared and Laser Engineering

基　　金：重点实验室基金(9140C530302150C53003)

摘　　要：从碎片目标的回波散射特性入手,将频率分集技术融入到目标的高分辨成像算法中。频率分集技术可以有效地克服碎片目标的角闪烁效应,提高回波的平均信噪比,有利于对空间碎片目标的检测和成像;同时,空间高速小尺寸碎片目标高分辨二维图像带宽需求过大、难以实现,采用低分辨信号实现高分辨成像,信号带宽远小于ISAR成像算法,同时考虑了目标高速运动引起的等效积累转角对成像的影响,通过对等效转动速度的估算,修正匹配滤波器,使之满足转台成像条件,完成目标高分辨二维成像。最后,利用文中提出的方法对喇叭形空间碎片进行建模与成像仿真,仿真结果表明,文中提出的方法可以在成像时间内有效地克服角闪烁起伏,获取目标高分辨率二维图像。According to the signal model of space debris, the frequency diversity technology was reconciled in the imaging method. The frequency diversity can suppress the angle glint of debris, and the average signal-to-noise ratio of echo will be improved. Meanwhile, the demand of bandwidth of two-dimensional imaging of high-speed space debris with small size was too wide to realize, then the low-resolution signal was used to the high-resolution imaging, the bandwidth was much smaller than the need of ISAR, and the influence of the equivalent integration angle caused by high-speed was considered,through the estimation of the equivalent rotating speed, the matched-filter was corrected, which can match the need of rotating imaging and accomplish the imaging. Finally, a simulation of trumpet debris was modeled and made by the method projected in this paper. The result indicates that the method can suppress the angle glint of debris during the time of imaging, and the high resolution image is achieved.

关 键 词：空间碎片 角闪烁 高分辨成像 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]