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首页> 外文期刊>Journal of guidance, control, and dynamics >Geometric Analysis and Design Method for Discontinuous Coverage Satellite Constellations
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Geometric Analysis and Design Method for Discontinuous Coverage Satellite Constellations

机译：间断覆盖卫星星座的几何分析与设计方法

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摘要

A new geometric approach for discontinuous coverage constellations in circular orbits is presented. Satellite constellations for zonal coverage with revisit times of more than one to two orbital periods are considered. The method is based on two-dimensional maps of visibility properties. The space dimensions are the right ascension of the ascending node (in the Earth-centered inertial frame) and the time. A new geometric pattern named a coverage belt is introduced. The coverage belt with sawtooth boundaries is formed by visibility intervals for a satellite at consecutive revolutions and the two-dimensional space is divided into two parts, with the revisit time near to and more than one orbital period, respectively. The revisit times for the satellite constellations are analytically computed as the sum of two terms: 1) the revisit time between straight-line envelopes of adjacent sawtooth coverage belts, and 2) the relative shift of the teeth in the belts. The last term is more than one and less than two orbital periods. Various types of interfaces between coverage belts are considered. Qualitative aspects of the solutions for well-known Walker-type constellations are discussed. Results are validated using extensive computer simulation and known solutions. Numerical examples of constellations with three to four satellites for discontinuous coverage of a specified latitude band are presented.
机译：提出了一种用于圆形轨道上不连续覆盖星座的新几何方法。考虑重访时间超过一到两个轨道周期的区域覆盖的卫星星座。该方法基于可见性属性的二维图。空间尺寸是上升节点（在以地球为中心的惯性系中）和时间的正确上升。引入了一种新的几何图案，称为覆盖带。具有锯齿形边界的覆盖带由卫星在连续旋转时的可见性间隔形成，并且二维空间分为两部分，重访时间分别接近和超过一个轨道周期。卫星星座的重访时间可通过以下两项计算得出：1）相邻锯齿覆盖带的直线包络线之间的重访时间，以及2）带中齿的相对移动。最后一项是一个以上且少于两个的轨道周期。考虑了覆盖带之间的各种类型的界面。讨论了著名的Walker型星座解决方案的定性方面。使用广泛的计算机模拟和已知解决方案来验证结果。给出了具有三到四颗卫星的星座的数值示例，用于不连续覆盖指定的纬度带。

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