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情报检索与小型计算机外存贮器的配置
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作者 余光镇 《现代图书情报技术》 1982年第Z1期150-151,共2页
关键词 外存贮器 小型计算 情报检索 平均数 磁盘存贮器 磁盘容量 文献数据库 关键词 比例关系 计算的项
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Rapid satellite-to-site visibility determination based on self-adaptive interpolation technique 被引量:4
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作者 HAN Chao GAO XiaoJie SUN XiuCong 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2017年第2期264-270,共7页
Rapid satellite-to-site visibility determination is of great significance to coverage analysis of satellite constellations as well as onboard mission planning of autonomous spacecraft. This paper presents a novel self... Rapid satellite-to-site visibility determination is of great significance to coverage analysis of satellite constellations as well as onboard mission planning of autonomous spacecraft. This paper presents a novel self-adaptive Hermite interpolation technique for rapid satellite-to-site visibility determination. Piecewise cubic curves are utilized to approximate the waveform of the visibility function versus time. The fourth-order derivative is used to control the approximation error and to optimize the time step for interpolation. The rise and set times are analytically obtained from the roots of cubic polynomials. To further increase the computational speed, an interval shrinking strategy is adopted via investigating the geometric relationship between the ground viewing cone and the orbit trajectory. Simulation results show a 98% decrease in computation time over the brute force method. The method is suitable for all orbital types and analytical orbit propagators. 展开更多
关键词 satellite-to-site visibility rapid determination self-adaptive Hermite interpolation viewing cone
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