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回归大椭圆轨道卫星轨迹保持策略与仿真 被引量:3
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作者 杨悦 吴功友 +1 位作者 白沁园 杨永安 《科学技术与工程》 北大核心 2013年第26期7711-7715,共5页
为了实现大椭圆轨道卫星星下点在一定经度范围内回归,保持对特定区域的长时间观测,对优化轨迹保持策略进行了深入研究。首先提出了必须根据共振大椭圆卫星的轨道演变规律进行轨迹保持。同时分析了大椭圆轨道卫星满足回归条件的轨道约束... 为了实现大椭圆轨道卫星星下点在一定经度范围内回归,保持对特定区域的长时间观测,对优化轨迹保持策略进行了深入研究。首先提出了必须根据共振大椭圆卫星的轨道演变规律进行轨迹保持。同时分析了大椭圆轨道卫星满足回归条件的轨道约束;其次分析了主要动力学模型的摄动规律,建立了轨道摄动对升交点赤经、半长轴以及轨迹漂移影响的计算模型;最后结合工程应用实际,给出了具体的回归大椭圆轨道的轨迹保持周期和保持策略。通过仿真实验及结果分析,表明了该策略的正确性和有效性,为回归大椭圆轨道卫星的轨道设计和测控实施提供技术参考。 展开更多
关键词 卫星 回归大椭圆轨道 轨迹保持 轨道演变
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Formation and Evolution of the Solar System as well as Expansion of the Universe and Global Climate Change
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作者 Cui-Xiang Zhong 《Journal of Earth Science and Engineering》 2014年第9期544-557,共14页
Having found some orbit variation mechanisms of natural satellites and planets, the author has revealed the formation and evolution law of the Moon. According to this law, the author has further revealed the formation... Having found some orbit variation mechanisms of natural satellites and planets, the author has revealed the formation and evolution law of the Moon. According to this law, the author has further revealed the formation and evolution law of the Solar System and other galaxies in the universe. Especially, the author has also explained why the eight planets around the Sun are prograde planets, why the orbits of the eight planets almost lie in the same plane, and why most planets rotate around their own axes from west to east. Additionally, the author could also explain the expansion of the universe as well as the cause of global climate change. 展开更多
关键词 Earth MOON Sun EVOLUTION GALAXIES kinematics and dynamics planets and satellites FORMATION stars rotation.
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Normally-Ordered Time Evolution Operator for Mass-Varying Harmonic Oscillator and Wigner Function of Squeezed Number State
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作者 唐绪兵 许雪芬 范洪义 《Communications in Theoretical Physics》 SCIE CAS CSCD 2010年第7期67-72,共6页
For investigating dynamic evolution of a mass-varying harmonic oscillator we constitute a ket-bra integrationoperator in coherent state representation and then perform this integral by virtue of the technique of integ... For investigating dynamic evolution of a mass-varying harmonic oscillator we constitute a ket-bra integrationoperator in coherent state representation and then perform this integral by virtue of the technique of integration withinan ordered product of operators.The normally ordered time evolution operator is thus obtained.We then derive theWigner function of u(t)|n>,where |n> is a Fock state,which exhibits a generalized squeezing,the squeezing effect isrelated to the varying mass with time. 展开更多
关键词 harmonic oscillator Wigner function damping mass-varying
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