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High-fidelity gravity modeling applied to spacecraft trajectories and lunar interior analysis.

机译：高保真重力建模应用于航天器轨迹和月球内部分析。

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摘要

As the complexity and boldness of emerging mission proposals increase, and with the rapid evolution of the available computational capabilities, high-accuracy and high-resolution gravity models and the tools to exploit such models are increasingly attractive within the context of spaceflight mechanics, mission design and analysis, and planetary science in general. First, in trajectory design applications, a gravity representation for the bodies of interest is, in general, assumed and exploited to determine the motion of a spacecraft in any given system. The focus is the exploration of trajectories in the vicinity of a system comprised of two small irregular bodies. Within this context, the primary bodies are initially modeled as massive ellipsoids and tools to construct third-body trajectories are developed. However, these dynamical models are idealized representations of the actual dynamical regime and do not account for any perturbing effects. Thus, a robust strategy to maintain a spacecraft near reference third-body trajectories is constructed. Further, it is important to assess the perturbing effect that dominates the dynamics of the spacecraft in such a region as a function of the baseline orbit. Alternatively, the motion of the spacecraft around a given body may be known to extreme precision enabling the derivation of a very high-accuracy gravity field for that body. Such knowledge can subsequently be exploited to gain insight into specific properties of the body. The success of the NASA's GRAIL mission ensures that the highest resolution and most accurate gravity data for the Moon is now available. In the GRAIL investigation, the focus is on the specific task of detecting the presence and extent of subsurface features, such as empty lava tubes beneath the mare surface. In addition to their importance for understanding the emplacement of the mare flood basalts, open lava tubes are of interest as possible habitation sites safe from cosmic radiation and micrometeorite impacts. Tools are developed to best exploit the rich gravity data toward the numerical detection of such small features.
机译：随着新兴任务提案的复杂性和大胆性的增加，以及可用计算能力的迅速发展，高精度和高分辨率重力模型以及用于开发此类模型的工具在航天力学，任务设计的背景下越来越有吸引力和分析，以及一般的行星科学。首先，在轨迹设计应用中，通常假定并利用目标物体的重力表示来确定航天器在任何给定系统中的运动。重点是探索由两个小型不规则物体组成的系统附近的轨迹。在这种情况下，最初将主体建模为巨大的椭球，并开发了构造第三身体轨迹的工具。但是，这些动力学模型是实际动力学状态的理想表示，并且不考虑任何干扰效应。因此，构造了将航天器保持在参考第三体轨迹附近的鲁棒策略。此外，重要的是评估作为基准轨道函数的在该区域中主导航天器动力学的扰动效应。可替代地，可以以极高的精度知道航天器围绕给定物体的运动，从而能够推导出该物体的非常高精度的重力场。随后可以利用这些知识来深入了解人体的特定属性。 NASA GRAIL任务的成功确保了现在可获得月球的最高分辨率和最精确的重力数据。在GRAIL调查中，重点是检测地下特征（例如母马表面下方的空熔岩管）的存在和程度的特定任务。除了对了解母马洪水玄武岩的位置具有重要意义外，开放式熔岩管也很受人们的关注，因为它们可能是不受宇宙辐射和微陨石撞击影响的栖息地。开发工具的目的是最好地利用丰富的重力数据对此类小特征进行数值检测。

著录项

  • 作者

    Chappaz, Loic P.R.;

  • 作者单位

    Purdue University.;

  • 授予单位 Purdue University.;
  • 学科 Aerospace engineering.;Planetology.
  • 学位 Ph.D.
  • 年度 2015
  • 页码 281 p.
  • 总页数 281
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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