论文标题
射弹对颗粒介质的影响
Radar for projectile impact on granular media
论文作者
论文摘要
从防止自然灾害（如滑坡和雪崩）到化学和土木工程行业的能源效率的提高，了解颗粒状材料的集体动态是与我们日常生活密切相关的基本问题。使用最近开发的多静电雷达系统，以$ 10 $ \，GHz（X频段）运行，我们探索了跟踪弹丸在颗粒介质内移动的可能性，重点介绍了检测和重建过程中可能的不确定性来源。一方面，具有连续波雷达的粒子跟踪提供了极高的时间分辨率。另一方面，准确获得示踪轨迹仍然存在挑战。我们表明，通过在获得的原始信号中纠正智商不匹配可以解决一些挑战。因此，可以通过亚毫米空间分辨率获得示踪轨迹。这样的进步不仅可以在雷达粒子跟踪上阐明，而且可以在与智商不匹配有关的问题的各种情况下进行启示。
From the prevention of natural disasters such as landslide and avalanches, to the enhancement of energy efficiencies in chemical and civil engineering industries, understanding the collective dynamics of granular materials is a fundamental question that are closely related to our daily lives. Using a recently developed multi-static radar system operating at $10$\,GHz (X-band), we explore the possibility of tracking a projectile moving inside a granular medium, focusing on possible sources of uncertainties in the detection and reconstruction processes. On the one hand, particle tracking with continuous wave radar provides an extremely high temporal resolution. On the other hand, there are still challenges in obtaining tracer trajectories accurately. We show that some of the challenges can be resolved through a correction of the IQ mismatch in the raw signals obtained. Consequently, the tracer trajectories can be obtained with sub-millimeter spatial resolution. Such an advance can not only shed light on radar particle tracking, but also on a wide range of scenarios where issues relevant to IQ mismatch arise.
