The paper expatiates the concepts and characteristics of invisible web,expatiates the reason of its forming in the information navigation system.
文章阐述了隐蔽网络资源的概念和特点及在信息导航中隐蔽网络形成的原因。
The content analysis based on information resources appentds knowledge to information navigation,and makes information navigation intelligent.
基于信息资源的内容分析给信息导航加入了知识指导成分,使得导航过程具有一定的智能性。
The category of the construction of literature resources of information navigation database for key disciplines in colleges and universities mainly includes information service in the worldwide web and the digitalization & virtualization of the number of books collected in the library.
建立重点学科信息导航库文献信息资源的范畴主要包括网上信息服务和馆藏数字化、虚拟化两个方面,同时需要得到有关方面的支持和帮助。
This paper proposes an accurate orbit determination technique to accurately determine orbit elements of a spacecraft equipped with a GPS receiver according to navigation messages from the receiver.
利用GPS接收机的导航信息精确确定接收机载体航天器的轨道根数。
low frequency radio-range
低频无线电导航信标
lowmedium frequency radio range
低中频无线电导航信标
omnidirectional radio range
全向无线电标距离全向无线电信标全向无线电导航信标
aural radio range
无线电导航有声信标
aeronautical radio beacon station
航空无线电信标电台
standard radio aids
标准无线电导航设备
equal signal system
等信号无线电导航系统
four course IF radio range
四航向中频无线电信标
four-course low-frequency radio range
四航道低频无线电信标
navaglobe beacon station
远程无线电导航系统航标站
aeronautical nondirectional radiobeacon
航空无指向性无线电信标
aeronautical radionavigation service
航空无线电导航业务
four-course radio range station
四航道无线电导航台
aeronautical radio aids
航空无线电导航设备
Marine Radio Navigation
船舶无线电导航海上无线电导航
For some time the German bombers had navigated largely by radio beacons.
有一个时期，德国轰炸机主要是靠无线电定向信标来导航的。
A radio network that provides aircraft with complete information on bearings.
全向导航网，全向无线电信标能给飞机提供方位方面的全部信息的无线电网
emergency position -indicating radio beacon
【航海】指示事故位置的无线电信标
