论文标题
用于初步性能分析和全球导航卫星系统星座的系统级工程方法
A System-Level Engineering Approach for Preliminary Performance Analysis and Design of Global Navigation Satellite System Constellations
论文作者
论文摘要
本文介绍了一种系统级工程方法，用于初步覆盖性能分析和通用全球导航卫星系统（GNSS）星座的设计。该分析既说明了覆盖范围的要求，也说明了星座的瞬态或灾难性失败的鲁棒性。欧洲GNSS伽利略被用作参考案例，以证明所提出的工具的有效性。该软件套件，称为GNSS覆盖分析工具（G-CAT），要求输入星座每个卫星的状态向量，并根据覆盖范围提供GNSS星座的性能。该工具提供了一个轨道传播器，态度传播器，一种算法，可从每个卫星识别地球表面上的可见性区域，并具有计数器功能来计算从地球表面的给定位置看到多少卫星。由于其计算负担低，该工具可以通过验证是否在Coplanar卫星之间的平面内角间距均匀的情况下验证是否满足覆盖范围和准确性要求来计算每个轨道平面的最佳卫星数量。
This paper presents a system-level engineering approach for the preliminary coverage performance analysis and the design of a generic Global Navigation Satellite System (GNSS) constellation. This analysis accounts for both the coverage requirements and the robustness to transient or catastrophic failures of the constellation. The European GNSS, Galileo, is used as reference case to prove the effectiveness of the proposed tool. This software suite, named GNSS Coverage Analysis Tool (G-CAT), requires as input the state vector of each satellite of the constellation and provides the performance of the GNSS constellation in terms of coverage. The tool offers an orbit propagator, an attitude propagator, an algorithm to identify the visibility region on the Earth's surface from each satellite, and a counter function to compute how many satellites are in view from given locations on the Earth's surface. Thanks to its low computational burden, the tool can be adopted to compute the optimal number of satellites per each orbital plane by verifying if the coverage and accuracy requirements are fulfilled under the assumption of uniform in-plane angular spacing between coplanar satellites.
