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25 April 1992, Volume 12 Issue 02 Previous Issue    Next Issue

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EFFICIENCY OF DISTORTED REFLECTOR ANTENNA Qi Yihong (State Key Laboratory of Millimeter Waves,Southeast University,Nanjing) 1992, 12 (02):  .  Abstract ( 1778 )   Save Based on the field correlation theorem,the efficiency expres- sion of distorted reflector antenna is deduced,which is valid for the slowly varying surface distortions,and its relation to Rutz's formula is dis- cussed.It provides a more accurate expression of electromagnetic—structural relationship for reflector antenna design. Related Articles | Metrics

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A CONTOURED BEAM ANTENNA DESIGN FOR CHINESE COMMUNICATION SATELLITE ON Ku BAND Zhong Ying Yi Nianxue Bu Binlong (Xi'an Institute of Space Radio Technology) 1992, 12 (02):  .  Abstract ( 2274 )   Save A design method of contoured beam antenna covering all Chi- nese territory is described for Chinese communication satellite on Ku band. By considering available technique and technology level of China,three feasible conceptions are presented;with the three conceptions,how to select geometry dimensions of the offset parabolic reflector,how to arrange feed locations of multiple beam antenna and how to optimize amplitude and phase excitation coefficients of the feeds are discussed progressively;at last, contour coverage patterns of the three conceptions are shown,and the comparison of advantage and disadvantage among the three conceptions are made. Related Articles | Metrics

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A Six-CANNELS CONTIGUOUS MULTIPLEXER AT Ku-BAND Wu Xuda (Xi'an Institute of Space Radio Technology) 1992, 12 (02):  .  Abstract ( 1604 )   Save A Ku-band,TE_(113) mode,6-channels contiguous multiplexer has been realized by using foreshortened 7-order quasi-elliptic doubly termi- nated filter.The measured results of the experimental model show that the design method used is feasible. Related Articles | Metrics

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ACCURACY OF AUTONOMOUS ORBIT DETERMINATION FOR NEAR EARTH SATELLITE BY USING GPS Yang Weilian (Beijing Institute of Spacecraft Systems Engineering) 1992, 12 (02):  .  Abstract ( 1610 )   Save This paper discusses the accuracy of autonomous orbit deter- mination for near-earth satellites by using GPS and related issues.At first, a relation between the orbit accuracy and the equivalent 3-dimension posi- tion accuracy is established,the potential orbit accuracy which can be obtained by C/A-code users is calculated then by using this relation.Results show that a ten-meter level orbit accuracy can be achieved for onboard C/A-code users. Related Articles | Metrics

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FOUR CONFIGURATION COMPARISION FOR DEVELOPING CHINESE SPIN STABILIZATION COMMUNICATION SATELLITE Bao Miaoqin (CAST,Beijing) 1992, 12 (02):  .  Abstract ( 1703 )   Save A comparison among four different configurations based on DFH-2A technology has been made for developing Chinese spin stabiliza- tion communication satellite,after analysing development approach used abroad.The development strategy of furture developing plan for this kind of satellite is main factor in configuration selection. Related Articles | Metrics

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STUDY ON DESIGN TECHNIQUES OF RECONFIGURABLE DISTRIBUTED FAULT-TOLERANT COMPUTER SYSTEMS Wang Dongsheng Zhang Hanying (Beijing Institute of Control Engineering) 1992, 12 (02):  .  Abstract ( 1486 )   Save This paper studies the design techniques of reconfigurable distributed fault-tolerant computer systems for space station.These tech- niques include:the methods of distributing,concurrence and reconfiguration to improve reliability and throughput of the system,application of reusable software base and development tools. Related Articles | Metrics

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GEOMETRIC RELATIONS OF NON-GEOSYNCHRONOUS SATELLITE TO THE SUN Zhang Zhaoxian (Shanghai Institute of Technical Physics,Chinese Academy of Sciences) 1992, 12 (02):  .  Abstract ( 2531 )   Save In this paper,formulae are given for the determination of projection of the critical points at which a nongeosynchronous satellite or- bit is just shone by the sun on a celestial sphere,the incident angles of the sunlight at all the planes of the satellite and the instruments on board,as well as the orbit sections and the probabilities,with which the internal colder blackbody of a satellite-borne infrared spectrometer is irradiated by the sun. Finally,as an example,calculation has been made for an infrared spectro- meter on board a polar orbit meteorological satellite.The results may be of reference value to the design of some parts of the spectrometer and to the selection of launching window for polar orbit meteorological satellites. Related Articles | Metrics

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SKIN TEMPERATURE AND HEAT FLOW OF HEAD-NECK REGION UNDER DIFFERENT AMBIENT TEMPERATURES Pang Cheng Gu Dingliang Wang Xianzhang Yu Xunbing Wu Jianmin (Institute of Space Medico-Engineering,Beijing) 1992, 12 (02):  .  Abstract ( 1739 )   Save Change patterns of skin temperature and heat flow in the head- neck region under the conditions of different ambient temperature have been observed and obtained.On the basis of experimental results,suggestion of amendment is given on the data about the heat dispersal calculated from original formulas.The paper provides a physiological basis for the engine- ering design of cooling devices in the head-neck region of a space suit. Head-neck,Heat transfer,Temperature,Test,Analyzing. Related Articles | Metrics

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VFAS ADAPTIVE SOFTWARE SYSTEM ON VIEW FACTORS Fu Zhenxuan (Beijing Institute of Information and Control) Li Xilun Yao Weidong (Beijing Institute of Spacecraft System Engineering) 1992, 12 (02):  .  Abstract ( 5923 )   Save Based on VF01 and VF02,VFAS system has made a great progress in reducing the user's man-hour and improving the accuracy of the calculation results.The calculation of viewfactor among different surfa- ces now may be changed into that among any different nodes,and the shadowing between nodes can be decided automatically by the system. Related Articles | Metrics

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CHANGES OF REG DURING 4h HEAD-DOWN BED-REST Shen Xianyun Xiang Qiulu Meng Jingrui (Institute of Space Medico-Engineering,Beijing) 1992, 12 (02):  .  Abstract ( 1704 )   Save In order to examine the adaptive capacity of humanbody for bearing weightlessness (WL),the 4h head-down 15° bed-rest was used to simulate WL.The tolerance time and the changes of REG during bed-rest for 38 subjects were observed.The result is that the regular changes of REG which reflect the state of brain circulation are found during the tes- ting and it associated with the subjects' tolerance time.The results indicated that the method of short time head-down bed-rest is an effective approach to examine the adaptive capacity of subjects for bearing WL and the REG is a valuable index. Related Articles | Metrics

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ANALYSIS OF DEPLOYMENT MOTION OF SATELLITE SOLAR WING Chen Liemin (Beijing Institute of Spacecraft Systems Engineering) 1992, 12 (02):  .  Abstract ( 1829 )   Save Solar wing is the main component of various applied satellites. The analysis of its deployment motion on orbit plays an important role in satellite design.This paper presents a simple and rapid calculation method which is suitable for engineering application, Related Articles | Metrics