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- First, the locally optimal control laws are derived for each modified equinoctial orbital element. 研究了近地小推力转移轨道的制导问题,给出了一种基于局部最优控制律的自主制导算法。
- The brief note gave the orbital elements of the hypothetical planet. 那张纸上写了那颗假想行星的轨道参数。
- If you want to do this kind of work, you should get yourself acquainted with the meaningof orbital elements. 如果你打算进行搜索,你必须知道有关轨道根素的基本知识。
- The positions of the other objects (asteroids, comets) are calculated by it's osculating orbital elements. 的立场，其他物体（小行星，彗星）的计算方式是，它的密切的轨道要素。Therefore the positions of these objects are accurate only for a small period of time.;因此，职位这些物体是准确的，只有一小部分的一段时间。
- This paper investigates the least maneuver velocity through the tolerable apolune and other lunar orbit elements. 另外，第一次近月制动失败后，卫星飞行大约15小时将飞离月球影响球。
- Abstract Based on Gauss perturbation equation, the variation equation of orbit elements under both J2 and atmosphere perturbation is derived. 摘要 基于高斯摄动方程，推导了卫星在同时考虑J2摄动和大气阻力摄动情况下的轨道要素变化方程。
- The secular influence of solar mass-loss on the orbital elements of meteor steams is examined by using the method of celestial mechanics of variable mass in this paper. 将作者在变质量天体力学所得理论结果应用于太阳质量损失对流星群轨道根数变化的长期效应上。
- Abstract The variation equation of the satellite orbit elements under both J2 and drag perturbations was derived based on the Gauss perturbation equation. 摘要 基于高斯摄动方程，推导了卫星在同时考虑J2和大气摄动情况下的轨道根数变化方程。
- As long as the first differential of the orbital elements with respect to time is made, the S, T, and W decomposition of perturbing forces (excluding the earth's central gravitation) can be obtained. 它只需对轨道根数求一次时间微分，便可求得摄动力的S、T、W分解(不含中心引力)。
- In a printer, the removable type element. 印刷机上可拆卸的打印部件。
- The tidal solutions obtained from SLR and satellite altimetry are used to compute the secular changes in the Moon's orbit elements and the Earth rotation rate in the ecliptic reference system. SLR和卫星测高的潮汐解被用来计算月球轨道根数相对黄道坐标系的长期变化和地球自转速率的长期变化。
- The spacecraft is in orbit around the moon. 该航天器在绕月球轨道运行。
- Aiming at this situation,satellite motion was described by nonsingular orbit elements and the corresponding impulsive control model for a near round reference satellite formation is derived. 针对高斯摄动方程在描述近圆轨道时其近地点幅角和平近点角存在奇异性的问题,采用非奇异轨道要素描述卫星轨道运动,推导了适用于近圆参考轨道编队的非奇异轨道要素脉冲控制模型。
- He's in his element when playing badminton. 他打起羽毛球来真是得心应手。
- This heater needs a new element. 这个加热器需要一组新电阻丝。
- I'm out of my element in political discussions. 我不喜欢参加政治讨论。
- Maintenance of PC is in my element. 我对电脑的维修保养很在行。
- The space shuttle will orbit a weather satellite. 太空梭将把一个气象卫星送入运行轨道。
- The launch vehicle lifts the satellite into orbit. 太空火箭将人造卫星送入运行轨道。
- Sulphur was not identified as an element until1810. 1810年以前还没有认出硫是一种元素。
