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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。
Starting from the echo scattering characteristics of the debris target, the frequency diversity technology is integrated into the target high-resolution imaging algorithm. The frequency diversity technology can effectively overcome the angular scintillation effect of the fragment target and improve the average signal-to-noise ratio of the echo, which is beneficial to the detection and imaging of the space debris target. Meanwhile, the bandwidth requirement of the high-resolution small-size space debris target high- Large and difficult to achieve, the use of low-resolution signals for high-resolution imaging, the signal bandwidth is much smaller than the ISAR imaging algorithm, taking into account the target high-speed motion caused by the equivalent accumulation of the angle of the imaging impact, through the equivalent rotational speed estimation, correction match Filter to meet the turntable imaging conditions to complete the target high-resolution two-dimensional imaging. Finally, the method proposed in this paper is used to model and simulate the flare space debris. The simulation results show that the proposed method can effectively overcome the angular flare fluctuation and obtain the target high resolution two-dimensional image within the imaging time.