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25 October 1991, Volume 11 Issue 05 Previous Issue    Next Issue

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MECHANICAL SOLAR ARRAY AND ANTENNA FOR THE CHINESE DFH-3 SATELLITE SYSTEM Qi Faren (CAST) L.Laux M.Reindl N.Nathrath H.G.Schnell (MBB,Germany) 1991, 11 (05):  1-7.  Abstract ( 2367 )   Save In July 1987 a cooperation contract between China GreatWall Industry Corporation and MBB was signed for the procurement of ma-jorelements of the Chinese C-band communication satellite DFH-3.Development and manufacture of the mechanical solar array and the com-munication antenna form part of this contract,related technical and prog-rammatic aspects are described.The design of the mechanical solar array isbased on flight proven technics.With this experience and a computer aideddesign optimization the severe mass and stiffness requirements could be satis-fied.The communication antenna for the coverage of the People's Republic ofChina is a specific development for DFH-3.Combined transmit/receive func-tion and full polarization multiplexing are the major features that have beenrealized by a polarization sensitive reflector assembly fed by two 7-hornarray clusters,each accommodated by a support structure.An extensive testprogramme proves compliance of electrical and structural performances withthe specifications. Related Articles | Metrics

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ESTIMATION OF ENVIRONMENTAL FACTORS FOR THE GAMMA DISTRIBUTION Wang Hongzhou Ma Baohua Shi Jusheng (Beijing Institute of Technology) 1991, 11 (05):  8-15.  Abstract ( 1571 )   Save Environmental factor estimation for the gamma distributionwith two parameters is studied here.In consideration of the characteristicsof the gamma distribution and the definition of environmental factors forthe exponential distribution and the convenience of data converting,the de-finition of environmental factors for the gamma distribution is proposed.In according to this definition,lower and upper confidence limits of environ-mental factors are derived by classical,Bayesian and Fiducial methods,andsome approximate confidence limits are also given.A practical example isprovided. Related Articles | Metrics

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MODEL AND SIMULATION FOR STAR BACKGROUND PROPORTION-INTEGRATION GUIDING METHOD Guo Zaozheng Lu Fengning (Beijing Institute of Satellite Information Engineering) Kang Jiaren (Beijing Institute of Precision Machineele-ctricity) 1991, 11 (05):  16-24+40.  Abstract ( 1612 )   Save In this paper,a model of “star background proportion-integ-ration guiding method” concerning the rendezvous of moving object withhigh speed out of the atmosphere.It includes CCD star image processing,guiding stars and object recognition,mathematical description of guidingmethod etc.Finally brief analysis of the simulation results is given. Related Articles | Metrics

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EXTRACTING INTRINSIC IMAGES IN COLOR IMAGE Huang Yuming (Beijing Institute of Control Engineerig) Xu Guangyou (Qing Hua University) Ye Peijian (CAST) 1991, 11 (05):  25-28.  Abstract ( 4469 )   Save The position and the color of a light source affect the image ofan object,and ideal results can't be obtained by usual segmentation algorithmdue to the appearence of highlights.The Dichromatic Reflection Model is usedto divide a color image into two intrinsic images——matte image and highl-ight image.The matte image is the original image with the highlights remo-ved,reflecting the invariance of the object and being not affected by theenvironmental factors(such as the position and the color of the light sour-ce);but the highlight image is just an image of highlights,reflecting theenvironmental factors,and providing information for shape from gloss.The color image in this paper refers to that of a monochrome object gene-rated by color CCD camera under monochrome light(not the light with singlewavelength). Related Articles | Metrics

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LONG-TERM IN-ORBIT PERFORMANCE OF THERMAL CONTROL SUBSYSTEM OF TWO COMMUNICATION SATELLITES Guo Jiurong (Beijing Institute of Spacecraft System Engineering) 1991, 11 (05):  29-33+64.  Abstract ( 1535 )   Save This paper briefly describes in-orbit performance of the thermalcontrol subsystems of two Chinese communication satellites.A study is alsogiven on some problems such as thermal control coating and thermal tesst. Related Articles | Metrics

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APPLICATION OF GPS TO PRECISION SATELLITE ORBIT DETERMINATION Liu Dongsheng (Beijing Institute of Satellite Information Engineering) 1991, 11 (05):  34-40.  Abstract ( 1859 )   Save Since GPS experimental constellation was built up,several kindsof method have been developed for precise determination of satellite orbit with GPS measurement.In 1984 a experimental Global Positioning SystemPackage(GPSPAC)was carried on LANDSAT-5 for validation of the acc-uracy of GPSPAC orbit solutions.In 1982,a research team in JPL developeda type of double differenced GPS range and doppler measurements to meetsubdeeimeter accuracy demand of TOPEX.Beside the application of GPS tolow-altitude earth orbit satellite,means and accuracy analysis have beenconceived for high orbit or even geosynchronous orbit determination.Thispaper intends to introduce and review the methods mentioned above in brief. Related Articles | Metrics

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RELIABILITY DESIGN OF ELECTRONIC EQUIPMENT BASED ON COMBINATION FTA—FMEA Tan Weizhi (Beijing Institute of Spacecraft Systems Engineering) 1991, 11 (05):  41-46.  Abstract ( 1777 )   Save This paper introduces a FTA-FMEA joint method for the ana-lysis of electronic clrcuits.The reliability design is carried out based on thismethod,therefore the reliability of the electronic equipment on board space-craft is increased effectively.The method and the examples presented in thispaper arc of reference value for electronic system designers. Related Articles | Metrics

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APPLICATION OF METEOROLOGICAL SATELLITE DATA IN ANALYSIS AND PREDICTION OF TYPHOON Jiang Jixi (Satellite Meteorology Center,State Meteorologial Administration) 1991, 11 (05):  47-55.  Abstract ( 1898 )   Save This paper presents comprehensively the important applicationof meteorological satellite data in monitoring and studing the formation,and development of typhoon, locating typhoon's position and estima ingits intensity,predicting its movement and heavy rain during its landingetc.in the past three decades.The results show that meteorological satellitetakes a great role and contains a tremendous potentiality in taking precau-tion against and relief from disarster caused by typgoon. Related Articles | Metrics

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STUDY OF INFRA-RED SIMULATION TECHNIQUE FOR TRANSIENT FLUXES OF SATELLITE Ma Youli Liu Feng Yang Shuying Qian Beixing Wang Yirong (Beijing Institute of Environmental Test Engineering) 1991, 11 (05):  56-64.  Abstract ( 1658 )   Save This article briefly describes the basic requirements of simu-lation using infra-red lamps,the composition of the simulation system andthe study of subsystems for transient thermal radiation flux simulation ofsatellite.The results of simulation test for 5 different flux profiles aregiven. Related Articles | Metrics

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THE RESEARCH FOR THE EXPLORATION MEASUREMENT OF THE SITE OF SATELLITE COMMUNICATION GROUND STATION Song Shushan (Jinan Communications College) 1991, 11 (05):  65-69.  Abstract ( 1623 )   Save This article gives the explanation of the technical requirementfor the exploration measurement of the site of the satellite communicationearth station and comes to the most necessary conclusion for establishingthe station from the calculation of the azimuth and elevation angle,thepermitted microwave interference level,and from the measurement of themicrowave interference,and also from the rough calculation of the transmitcoordination distance. Related Articles | Metrics