Results 151 to 160 of about 18,179 (315)

The Principle and Application of Maser Navigation [PDF]

open access: yesarXiv, 2008
The traditional celestial navigation system (CNS) is used the moon, stars, and planets as celestial guides. Then the star tracker (i.e. track one star or planet or angle between it) and star sensor (i.e. sense many star simultaneous) be used to determine the attitude of the spacecraft. Pulsar navigation also be introduced to CNS.
arxiv  

mtPCDI: a machine learning-based prognostic model for prostate cancer recurrence

open access: yesFrontiers in Genetics
BackgroundThis research seeks to formulate a prognostic model for forecasting prostate cancer recurrence by examining the interaction between mitochondrial function and programmed cell death (PCD).MethodsThe research involved analyzing four gene ...
Guoliang Cheng   +6 more
doaj   +1 more source

THE DEVELOPMENT OF NAVIGATION SYSTEMS IN CIVIL AVIATION

open access: yesНаучный вестник МГТУ ГА, 2017
The article describes the history of navigation systems formation, such as "Cicada" system, which at that time could compete with the US "Transit", European, Chinese Beidou navigation system and the Japanese Quasi-Zenit.The detailed information about ...
A. S. Stepanenko
doaj  

Design of double band Beidou navigation antenna with wide axial ratio beam

open access: yesZhongguo Jianchuan Yanjiu
ObjectivesIn order to effectively broaden the beam width of the 3 dB axis ratio of a Beidou antenna, this paper proposes a slotted laminated microstrip patch antenna loaded with parasitic elements.
Zhuolin DENG   +3 more
doaj   +1 more source

Design and Simulation of Regional Navigation Constellation with Optimized Mean DOP based on Hybrid GEO and IGSO Satellites [PDF]

open access: yes, 2019
In this article, achieving an optimal layout of satellite constellation has been investigated with the aim of navigation (positioning) and with the least amount of error in a region coverage. In navigation, a parameter defined as DOP specifies influences
keyvani, firooz, Torabi, Seyed Hosein
core   +1 more source

Beidou Time Synchronization Receiver for Smart Grid

open access: yesEnergy Procedia, 2011
AbstractA time synchronization system based on the Chinese GPS system i.e. Beidou or Compass for smart grid applications is illustrated. A time synchroni-zation Beidou receiver with self-designed radio frequency IC (RFIC) is presented. The receiver provides precise one pulse per second (1PPS) timing service for the smart grid.
openaire   +2 more sources

Orbital Debris Quarterly News [PDF]

open access: yes
No abstract ...
Anz-Meador, Phillip D.
core   +1 more source

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