arXiv 1111.25282011-11-10astro-ph.EP

存在宇宙时绕地天体的物像连接

Object Image Linking of Earth Orbiting Objects in the Presence of Cosmics

Carolin Früh, Thomas Schildknecht

备注：: Accepted for Publication; Advances in Space Research, 2011
DOI：: 10.1016/j.asr.2011.10.021

摘要：

在对未知地球轨道物体的系列巡天中，没有先验轨道要素。在宽视场望远镜的巡天中，可能有许多未分辨的物体图像出现在系列的单个帧上。必须找到可靠的方法来将来自同一对象的对象图像彼此关联，即所谓的链接。宇宙射线事件的存在，即所谓的宇宙学，使未分辨图像的可靠链接变得复杂。目标图像的轨迹片段允许提取用于第一轨道确定的精确位置。在西班牙特内里费岛欧空局空间碎片望远镜的空间碎片勘测观测框架上使用并测试了一种两步法：第一步，在单个观测框架中应用宇宙滤波器。四种不同的过滤方法进行了比较和测试的性能。在第二步骤中，基于对象在观测系列期间在帧上线性加速移动的假设，将检测到的对象图像链接到观测系列上，该观测系列利用可以成功链接的每个对象图像进行更新。

英文摘要：

In survey series of unknown Earth orbiting objects, no a priori orbital elements are available. In surveys of wide field telescopes possibly many nonresolved object images are present on the single frames of the series. Reliable methods have to be found to associate the object images stemming from the same object with each other, so-called linking. The presence of cosmic ray events, so-called Cosmics, complicates reliable linking of non-resolved images. The tracklets of object images allow to extract exact positions for a first orbit determination. A two step method is used and tested on observation frames of space debris surveys of the ESA Space Debris Telescope, located on Tenerife, Spain: In a first step a cosmic filter is applied in the single observation frames. Four different filter approaches are compared and tested in performance. In a second step, the detected object images are linked on observation series based on the assumption of a linear accelerated movement of the objects over the frame during the series, which is updated with every object image, that could be successfully linked.

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