Enhanced geopotential field modelling as basis for the establishment of precise height systems (Geo-H)

增强的位势场建模作为建立精确高度系统（Geo-H）的基础

• 批准号: 468696263
• 负责人: Professor Dr. Roland Pail
• 金额: --
• 依托单位: Deutsches Geodätisches Forschungsinstitut
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/468696263?language=en
• 关键词: Enhanced; geopotential; field; modelling; basis

A current challenge of Geodesy is the implementation of an integrated Global Geodetic Reference Frame (GGRF) that supports the coherent determination and monitoring of the Earth’s geometry, rotation, and gravity field changes with high accuracy worldwide as defined by the International Association of Geodesy (IAG) and declared by the United Nations Resolution on a GGRF for Sustainable Development in 2015. The main objective of the project Geo-H is to develop the methodological foundation for the realization of modern geopotential-based height systems in agreement with the definitions of a global International Height Reference System (IHRS) as a main requirement to advance towards the GGRF. Based on the expertise of the “Ingenieurinstitut für Astronomische und Physikalische Geodäsie” (IAPG) and the “Deutsches Geodätisches Forschungsinstitut der Technischen Universität München” (DGFI-TUM) on high-resolution gravity field and regional geoid modelling, we aim at (1) quantifying with high reliability the error budget of the physical height determination,(2) developing new concepts and methods towards improved geopotential solutions and their accuracy assessment, and (3) providing scientific guidelines and a roadmap for the realization of globally consistent geopotential-based height systems. The project is built on three cornerstones: (1) Error budget analysis from the validation of regional geopotential (geoid) models by means of comparison to independent observations and the identification/reduction of systematic errors associated to different geoid modelling methods. (2) Improvement of stochastic models, spectral combination and optimal weighting of gravity data of different resolutions to implement rigorous error propagation analyses in the determination of geopotential (geoid) models. (3) Compilation of a scientific concept for the establishment, maintenance, and long-term sustainability of geopotential-based height systems, with emphasis in the establishment of the global IHRS. Methodologies, developments and findings of Geo-H will be placed on international level as baseline methods, to be used as guidelines for science and administration in the realization of the IHRS, and more general, in the realization of geopotential-based height systems.

目前大地测量学面临的一个挑战是实施一个综合的全球大地测量参考系（GGRF），该参考系支持在全球范围内高精度地确定和监测地球几何、自转和重力场变化，该参考系由国际大地测量协会（IAG）定义，并于2015年由联合国关于GGRF促进可持续发展的决议宣布。Geo-H项目的主要目标是为实现与全球国际高度参考系统（IHRS）定义一致的基于地球位势的现代高度系统开发方法学基础，这是向全球高度参考系统推进的主要要求。基于德国<s:1>天文与物理研究所Geodäsie （IAPG）和德国Geodätisches科技研究所Universität机械研究所（DGFI-TUM）在高分辨率重力场和区域大地水准面建模方面的专业知识，我们的目标是：(1)高可靠地量化物理高度确定的误差预算；(2)开发新的概念和方法来改进地球势解及其精度评估。(3)为实现基于地球势的全球一致高度系统提供科学指导和路线图。该项目建立在三个基础之上：(1)通过与独立观测的比较，对区域大地水准面模型进行验证的误差预算分析，并识别/减少与不同大地水准面建模方法相关的系统误差。(2)改进随机模型、谱组合和不同分辨率重力数据的优化加权，在确定大地水准面模型中实现严格的误差传播分析。(3)构建基于地势的高度系统的建立、维护和长期可持续性的科学概念，重点是建立全球IHRS。Geo-H的方法、发展和发现将在国际一级作为基准方法，作为实现《国际卫生条例》的科学和行政准则，更一般地说，用于实现基于地球势的高度系统。