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Study of Some Strategies for Disposal of the GNSS Satellites

机译：GNSS卫星处置的若干策略研究

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摘要

The complexity of the GNSS and the several types of satellites in the MEO region turns the creation of a definitive strategy to dispose the satellites of this system into a hard task. Each constellation of the system adopts its own disposal strategy; for example, in the American GPS, the disposal strategy consists in changing the altitude of the nonoperational satellites to 500 km above or below their nominal orbits. In this work, we propose simple but efficient techniques to discard satellites of the GNSS by exploiting Hohmann type maneuvers combined with the use of the 2(omega) over dot + (Omega) over dot approximate to 0 resonance to increase its orbital eccentricity, thus promoting atmospheric reentry. The results are shown in terms of the increment of velocity required to transfer the satellites to the new orbits. Some comparisons with direct disposal maneuvers (Hohmann type) are also presented. We use the exact equations of motion, considering the perturbations of the Sun, the Moon, and the solar radiation pressure. The geopotential model was considered up to order and degree eight. We showed the quantitative influence of the sun and the moon on the orbit of these satellites by using the method of the integral of the forces over the time.
机译：GNSS的复杂性和MEO区域中几种类型的卫星，使确定策略的创建成为了一项艰巨的任务。系统的每个星座都采用自己的处置策略；例如，在美国GPS中，处置策略是将非运行卫星的高度更改为高于或低于其公称轨道500 km。在这项工作中，我们提出了一种简单而有效的技术，即通过利用Hohmann型机动技术并结合使用点上的2（Ω）+点上的（Ω）（近似于0共振）来增加GNSS的轨道偏心率，从而丢弃GNSS卫星促进大气折返。结果以将卫星转移到新轨道所需的速度增量表示。还介绍了与直接处置策略（霍曼型）的一些比较。考虑到太阳，月亮和太阳辐射压力的扰动，我们使用精确的运动方程。认为地势模型的阶数为8级。我们使用时间力的积分方法显示了太阳和月亮对这些卫星轨道的定量影响。

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