论文标题
低频盲目调查使用非固定的被动雷达与Murchison宽阔的田野阵列对低地球轨道环境
A Low Frequency Blind Survey of the Low Earth Orbit Environment using Non-Coherent Passive Radar with the Murchison Widefield Array
论文作者
论文摘要
我们已经扩展了以前的工作，将Murchison广场阵列（MWA）用作FM频带中的非连锁无源雷达系统，使用陆地FM发射器来照亮低地球轨道LEO中的物体，将MWA作为敏感的接收元件，用于雷达返回。我们已经实施了一种盲目检测算法，该算法在使用标准干涉成像技术构建的差异图像中搜索这些反射信号。从20个小时的存档MWA观测值开始，我们对狮子座进行了调查，检测到多个通行证上的74个独特的对象，并证明MWA是全球太空领域意识网络的宝贵补充。我们检测到的物体范围为977 km，小至0.03 m^2雷达横截面。我们发现30个物体是非手术卫星或上层火箭的身体碎片。此外，我们还检测到飞船飞越MWA的双子座流星和飞机的FM反射。发现LEO中对象的大多数检测都在以前可行性研究预测的参数空间内，从而验证了该应用程序MWA的性能。
We have extended our previous work to use the Murchison Widefield Array (MWA) as a non-coherent passive radar system in the FM frequency band, using terrestrial FM transmitters to illuminate objects in Low Earth Orbit LEO) and the MWA as the sensitive receiving element for the radar return. We have implemented a blind detection algorithm that searches for these reflected signals in difference images constructed using standard interferometric imaging techniques. From 20 hours of archived MWA observations, we conduct a survey of LEO, detecting 74 unique objects over multiple passes and demonstrating the MWA to be a valuable addition to the global Space Domain Awareness network. We detected objects with ranges up to 977 km and as small as 0.03 m^2 radar cross section. We found that 30 objects were either non-operational satellites or upper-stage rocket body debris. Additionally, we also detected FM reflections from Geminid meteors and aircraft flying over the MWA. Most of the detections of objects in LEO were found to lie within the parameter space predicted by previous feasibility studies, verifying the performance of the MWA for this application.
