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25 October 1993, Volume 13 Issue 05 Previous Issue    Next Issue

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INDUSTRIALIZATION OF SATELLITE COMMUNICATION Yang Jiachi Yang Zhaode Chen Yingcai (Chinese Academy of Space Technology,Beijing) 1993, 13 (05):  1-5.  Abstract ( 1980 )   Save In this article,a briefhistory of satellite communication deve-loped by China is reviewed.The present situation and effects of chinese satel-lite communication are particulaty described.On the basis ot investigation ofdomestic market,the satellite communication transponders quantity needed bydomestic users in 1988—2001 is predicted. Related Articles | Metrics

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RESEARCH OF LARGE ASTRONOMICAL TELESCOPE Ma Pinzhong (Nanjing Astronomical Instrument Research Center,Academia Sinica) 1993, 13 (05):  6-14+60.  Abstract ( 1848 )   Save The paper describes a 4.3m Optical-Infrated telescope.Throughvacuum pipe communication of 4.3m telescope and 2.16m telescope,CCD imagingprocess and optical interfering measurement have been made.The concentratinglight power has been enhanced to that equivalent to 4.8m teleseope and itsresolution enhanced to that equivalent to 10m telescope. Related Articles | Metrics

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TRUNCATION ERROR OF COMPUTATION FORMULA OF SOLAR ABSORPTANCE Qiu Jiawen (Lanzhou Institute of Physics) 1993, 13 (05):  15-20.  Abstract ( 3067 )   Save The truncation error ot the computation formula of solar absorp-tance,used in engineering,has been analyzed and discussed in detail.Thetormulae of truncation error have been derived mathematically.And the compu-tation example has been given.The results obtained are of reference value tothe measurement of the optical and thermal performances of satellite thermal—control coatings and solar selective coatings. Related Articles | Metrics

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X BAND MICROWAVE CHANNEL OF DIGITAL TRANSMISSION USED IN REMOTE SENSING SATELLITE Lei Changquan (Xi'an Institute of Space Radio Technology) 1993, 13 (05):  21-28.  Abstract ( 1758 )   Save This paper describes emphatically the single and binary channelmicrowave transmitting system used in remote sensing satellite,and discussesbriefly up-converter and frequency multiplier in this system,and also showsthat the binary channel microwave transmitting system can raise the code rateot channel transmission. Related Articles | Metrics

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A PARTICLE DETECTOR SYSTEM FOR SATELLITE Lou Binqiao (Beijing University) 1993, 13 (05):  29-31.  Abstract ( 1534 )   Save This paper presents a design of a particle detector system forsatellite,The range of electron energy is 0.5～4 MeV.The range of protonenergy is 5～60Me V.The weight of the system is about 300g.The powerconsumption is 600mW and the reliability is high. Related Articles | Metrics

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DEVELOPING TRENDS OF SPACE ELECTRONIC TECHNOLOGY Chen Shiping (MIEE) Wang Yifei (Xi'an Institute of Space Radio Technology) 1993, 13 (05):  32-37.  Abstract ( 1590 )   Save In this paper the state-of-art of TT&C,satellite communica-tion and broadcasting,spaceborne remote sensing and location technologyis described briefly and their developing trends are also discussed. Related Articles | Metrics

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ON FOUNDATION CONSTRUCTION OF CDAS STATION AERIAL Han Dingjiu (CAST,Beijing) 1993, 13 (05):  38-44.  Abstract ( 1861 )   Save This paper have,first,introduces the technology condition andaccuracy of deformation in a 20 meters aerial foundation construction of CDASstation,and the erection precision in eivil engineering construction.Then,itgives the data and results ot the test during the construction,such as indexot subsidence control,resonance irequency and concentricity.Finally,it alsogives an analysis of the subsidence and the resonance frequency.The experience obtained from the constructiou of aerial toundation willbecome a reference for other ditlerent kinds oi aerial toundation construction inthe future. Related Articles | Metrics

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RELIABILITY ESTIMATION OF INFORMATION OBTAINED BY SPACECRAFT Zhang Dianhu Yang Baoan (Northwestern Polytechnical University,Xi'an) 1993, 13 (05):  45-49.  Abstract ( 1663 )   Save Meteorological astronautical system is a meteorological systemwhich consists of one or several spacecraft.Meteorological astronautical systemprovides meteorological observation information in regions or in the world forusers.In order to estimate reliability of information obtained from meteorologicalastronautical system,reliability of information obtained from one or several spa-cecraft has been estimated respectively in this article,meanwhile informationestimation matrixes have been obtained.Finally,the estimated value of lowerlimit of credibility is discussed. Related Articles | Metrics

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AIR-BORNE TEST OF WIDE FIELD LINEAR ARRAY CCD CAMERA FOR SATELLITE USE Lin Kexiang Liu Fuan Wang Rensong (Xi'an Institute of Space Radio Technology) 1993, 13 (05):  50-54.  Abstract ( 2136 )   Save In satellite remote sensing,using wide field linear array CCD ca-mera and high resolution CCD camera as a combination of sensors is a feasibleapproach.The former is used for coarse observation oi the earth resources in-formation and the later for fine observation.The development of the wide fieldCCD camera for satellite use and its air-borne test result on board small sizepilotless aircraft are presented.In system design,main consideration is givento geometric resolution and radiation resolution.The problem of items,suchas swath and recovery period etc,are also discussed.The camera is installed ona two axes stabilization platform to obtain good air-borne test result. Related Articles | Metrics

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A NEW FAST POLYGONAL LINEAR APPROXIMATION ALGORITHM Li Wende (Beijing University of Aeronautics and Astronautics) Xu Yuqiu (Beijing Institute of Control Engineering) 1993, 13 (05):  55-60.  Abstract ( 2354 )   Save A new fast polygonal approximation algorithm is presented.Itcombines two techniques of dominant poinis detection algorithm by corner detection and polygonal approximation algorithm.By comparing the algorithm withother algorithms,it was found that the proposed algorithm has features of feweroutput dominant points more accurate positions of dominant points and higherspeed. Related Articles | Metrics

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A PROPOSAL FOR UPGRADE OF MICROWAVE SYSTEM IN LANDSAT GROUND STATION Lu Peiye (Chinese Remote Sensing Satellite Ground Station) 1993, 13 (05):  61-65+28.  Abstract ( 1673 )   Save This paper disccuses a proposal to perform the upgrade recei-ving station for receiving Landsat-6.After finishing this work,it willbe compatible with data reception of not only Landsat-5,Landsat-6,SPOT,but also ERS-1,JERS-1,the Resource Satellite-1 that will he lau-nched soon by chinese,and the other satellites that down links from8025MHz to 8400MHz by using suitable demodulator. Related Articles | Metrics

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NFLUENCE OF 24h HEAD-DOWN BED-REST ION PHYSIOLOGICAL FUNCTION OF HUMAN Shen Xianyun Huang Huaming Chen Shigui Xiang Qiulu Meng Jingrui (Institute of Space Medico-Engineering,Beijing) 1993, 13 (05):  66-71.  Abstract ( 1901 )   Save In order to observe the dynamic features of physiological functionof human body during the initial stage of space fligh and to study the mecha-nism of “space adaptation syndrom”,the heart rate,respiration,head and legbody surface temperatures and EEG were observed in 12 subjects during head-down 6°bed-rest.All the indices were recorded in a physiological data aquis-sition and processing system for out bed-rest laboratory.Analysis items includethe trend of heart rate,body temperatures,respiration and EEG during 24hbed-rest.R-R spectrum and EEG power spectrum.The results showed that some important physiological functions such asheart rate,respiration and EEG,were still remained circadian during head-down bed-rest,But some extent disorders were appeared,i.e.(1)The twohumps of heart rate rhythm which appear in normal condition were disappearedor indistinct,and the phase of heart rate rhythm was shift.(2)The circadianrhythm of body temprature was changed.The rhythem in head surface tempe-rature disappeared and the surface temperature in leg increased significantlyduring the intinial several hours,after then decreased,and the fluctuationwas remarkable.(3)The power in α band decreased and the power in δand θ band increased during bed-rest.The biorhythmic analysis indicated adecrease of circadian rhythm stability and showed a phase shifting.The resu-lts of R-R spectrum and and EEG power spectrum showed that the regulationof heart and brain and cerebral cortical activities were changed during 24hbedrest. Related Articles | Metrics