space navigation
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.
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.
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.
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.
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.
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.
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.
10.The targeted readership of Digital Communication World includes: managers and technical personnel in administrative departments of various levels of the Ministry of Information Industry, Ministry of Radio, Film and Television, Ministry of Aviation and Space, and defense industry; users of proprietary networks of maritime, transportation, petroleum, coal, water conservancy and public security; Communication operators, equipment manufacturers, equipment providers, system integrators, network service providers and users; Equipment manufacturers, operators of satcom, navigation and positioning, and earth observation; Enterprises of radio and television, all departments of radio, film and television at prefecture or county level, and relevant institutions and operators; and experts, scholars, technical and engineering personnel, teachers and students of science research institutions, R&D organizations and universities.
