| 1. | Constellations and their orbit control techniques
星座与星座轨道控制技术 |
| 2. | However classical methods could not meet these requirements in some cases
经典的轨道控制和轨道确定方法有时无法满足这些要求。 |
| 3. | With the diversification and complication of space mission requirements , it is necessary for orbital control and orbital determination to meet these requirements
随着航天任务需求的多样化和复杂化，卫星的轨道控制和轨道确定提出了新的要求。 |
| 4. | The control of the trajectory is the core technique in horizontal well technique , while trajectory design and optimal design are the two key techniques
井眼轨迹控制是侧钻水平井技术的核心，而轨道设计与优化设计又是轨道控制技术的两大关键技术之一。 |
| 5. | These results provide theory and tool for the design and realization of further study the satellite orbit control system ; ( 2 ) discuss the satellite attitude and position / attitude tracking control problems
这些研究成果对于进一步研究人造卫星轨道控制系统的设计和实现提供了理论和工具。 ( 2 )讨论了人造卫星姿态跟踪控制和位姿(即位置和姿态)跟踪控制问题。 |
| 6. | Precision controls of primary propulsion , orbit control , high precision attitude control and stationkeeping on micro - satellites are required , which appeals for more advanced in orbit propulsion technologies , with low volume and weight , high isp
对于微、小卫星上的主推进，轨道控制，高精度姿态控制等任务，要求应用于微、小卫星的推进技术具有重量轻、体积小、比冲高等特点。 |
| 7. | With advantages of simple and reliable in structure , high isp and easy control over a wide range of thrust , pulsed plasma thruster （ ppt ） is very suitable for micro - satellite ' s orbit control and high precision attitude control
脉冲等离子体推力器（ ppt ）具有结构简单可靠，比冲高，推力在较大范围可控的特点，适合用于微、小卫星轨道控制和小卫星高精度姿态控制，其研究和应用得到了重视。 |
| 8. | The crucial technologies of highly - displacement well mainly include torque / friction and wellbore trajectory control tool , and these technologies require rock bit have the following characteristics : having gage protection ability , long axletree lifespan , wear - resisting shirt - tail and head o . d . , and high - temperature - resistant sealed system , etc
大位移井的关键技术主要有扭矩摩阻和井眼轨道控制工具，这些技术要求钻头具有以下特点：具有良好的保径能力，轴承寿命长，掌尖和掌背部位耐磨损，密封系统耐高温等。 |
| 9. | This thesis deals with the following results with regard to the control systems of satellite : ( 1 ) on the basis of global geometry theory , deprive the representation of state equation for the satellite orbit control system under the geometric restraint , show that the geometrical structure of geometric restraint affect on satellite orbit control system , and study the connection between the equilibriums state of the control system and the geodesies of the geometric restraint
对于人造卫星控制系统的研究，本论文的主要工作表现在以下几个方面： ( 1 )基于整体微分几何理论推导出人造卫星轨道控制系统在几何约束下的整体化方程，展示了几何约束条件对人造卫星轨道控制系统的影响。并且讨论了具有几何约束的人造卫星轨道控制系统的平衡态与几何约束条件之间的关系。 |
| 10. | This paper improved these methods based on the requirements 0 there are two methods for conventional orbital control : one is algebra method which deals with the problems by optimization based on orbit geometry characteristics the first method is applied when we adopt impulsive control , but in the multiobjective cases the method has its limitation
传统的轨道控制一般基于两种方法，一种是代数优化方法，这种方法与卫星的轨道几何特性相结合进行分析，将轨道的几何特性和优化指标用代数方程的形式表示出来进行求解，这种方法主要用于冲量式控制。 |
