The availability of engineering models to estimate the risk from space debris is essential for space missions. According to current research, cumulative flux calculation is mostly carried out based on the equal-width interval discretization. The method discretizes the volume around the Earth into cells defined in earth centered inertial coordinates. The resulting debris flux onto a target object is shown to depend on the chosen size of the cells. To avoid a discretization error, this must be accounted for. In order to present reliable flux predictions for space mission, the algorithm improvement is an ongoing topic for the related research field. The aim of this study was to examine the discretization error during the cumulative flux determination process. Both the effect of interval step length and the orbital boundary are under investigation. Several typical orbits are selected as examples here and the 2018/01/03 TLE (Two Line Element) data published by the US Space Surveillance Network is used as the debris background in this paper. Furthermore, the Interval Distance-Based method for Discretization (IDD) is adopted in this paper. A position-centered flux determination method is introduced based on the IDD method. According to the example analysis, the IDD used in the flux calculation process provides results which are less affected by the interval step-size setup; and the orbital boundary has no effect on the calculation process. In other words, the discretization error is significantly reduced. The position-centered method provided a possible suggestion for the improvement of space debris environment models.

工程模型的可用来估算空间碎片带来的风险对于空间飞行至关重要。根据目前的研究，累积通量计算主要是基于等宽间隔离散化进行的。该方法将地球周围的体积离散为在以地球为中心的惯性坐标中定义的单元。显示到目标物体上的最终碎片通量取决于所选择的像元大小。为了避免离散化错误，必须考虑到这一点。为了提出用于太空任务的可靠通量预测，算法改进是相关研究领域的一个持续进行的主题。这项研究的目的是检查累积通量确定过程中的离散误差。间隔步长和轨道边界的影响都在研究中。本文以几个典型的轨道为例，本文以美国空间监视网络发布的2018/01/03 TLE（两线元素）数据作为碎片背景。此外，本文采用基于间隔距离的离散化方法（IDD）。介绍了一种基于IDD方法的位置中心通量确定方法。根据示例分析，通量计算过程中使用的IDD提供的结果受间隔步长设置的影响较小；轨道边界对计算过程没有影响。换句话说，离散化误差显着降低。以位置为中心的方法为改进空间碎片环境模型提供了可能的建议。