• 基本释义

1.This paper introduces the new radiom et ric technologies adopted at Deep Space Network (DSN)of NASA, USA. Also,it di scusses the realistic significance of these technologies for the development of China deep space navigation technology.
本文介绍了美国航空航天局所属深空网 (DSN)在无线电跟踪测量方面已采用的新技术的应用情况 ,探讨了这些技术对于我国发展深空导航技术的实际意义。收藏指正
2.Boron carbide has important applications in the fields of refractory,engineering ceramics, nuclear industry, space navigation,owning to the excellent properties of high melting point,high hardness,low density,and good neutron absorbability,chemical corrosion resistance as well.
B4C具有高熔点、高硬度、低密度等优良性能,并具有良好的中子吸收能力和抗化学侵蚀能力,因而广泛应用于耐火材料、工程陶瓷、核工业、宇航等领域。收藏指正
3.Through much research into methods on autonomous orbit determination of deep-space explorer, an autonomous optical navigation scheme based on UD and EKF was proposed to determine the circling orbit state in time, in which star sensor and navigation camera are used in measuring special angles between planetoids and explorer.
通过对深空探测器绕飞段自主轨道确定方法的研究,提出利用星敏感器及光学导航相机,通过对小行星附近多颗小天体夹角的测量并存储,同时结合几何关系,来实时确定飞行器轨道状态的一种基于UD分解的扩展卡尔曼滤波的光学自主导航的方案,并给出其UD分解构造算法;收藏指正
4.In deep space exploration,it is difficulty for continuous navigation and communication in all weather,and it is especially impossible for our country to construct a global deep space network.
针对我国难以全天候24小时对探测器连续测控和通信,以及建立全球性深空网络困难的问题,提出利用地球静止轨道卫星编队进行深空导航的构想。收藏指正
5.the theory and practice of navigation through air or space.
航行天空与太空的理论与实践。收藏指正
6.The mechanism of text feature extraction was studied based on the factor analysis. The text features were extracted by identifying the latent conceptual structures,and they can be used to improve the skew intersection on the vector space models. The mechanism of visualization navigation was exposed based on the conceptual structures in the text which hierarchically display the content of texts according to users′ interests.
文本挖掘是从非结构化的文本中发现潜在的概念以及概念间的相互关系·鉴于中文文本的特点 ,提出了基于因子分析的文本特征抽取机制·通过识别文本中潜在的概念结构来抽取特征项 ,而且有助于改善向量空间模型中各个分量间的斜交现象·同时给出了基于概念的信息导航机制 ,按概念层次和上下文环境展现用户所关心的内容收藏指正
7.a vehicle designed for navigation in or on water or air or through outer space.
为了航海、水运、空运或太空而设计的交通工具。收藏指正
8.That suggests that GPS satellite navigation, capacity for mobile television and storage space for hundreds of music tracks will also be standard features before long.
这表明GPS卫星导航系统、支持手机电视、数百首音乐的存储空间在不久以后也会成为标准配置。收藏指正
9.Some variable gains of control adjustment orders used in the control system of strapdown inertial navigation systems(SINS) are calculated by using the parameter space method.
针对捷联惯性导航系统 ,利用参数空间划分法计算了在不同调节规律下不同区域的增益的数值 .收藏指正