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25 August 1992, Volume 12 Issue 04 Previous Issue    Next Issue

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DEPLOYMENT AND SHOCK ANALYSIS OF SPACECRAFT SOLAR ARRAY Zhou Zhicheng (Beijing Institute of Spacecraft Systems Engineering) 1992, 12 (04):  2-5.  Abstract ( 1613 )   Save This paper presents a method of shock analysis of deployablesolar array.The dynamical model is obtained using the Finite Segment Me-thod.The curves of acting forces on BAPTA and attitude angles of a satel-lite are given by using the software SDFX. Related Articles | Metrics

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POSITIONING AND NAVIGATION FOR VISUAL GUIDED ROBOT Huang Yuming (Beijing Institute of Control Engineering) 1992, 12 (04):  6-9+48.  Abstract ( 1632 )   Save Summarizing the previous work concerning qualitative naviga-tion for robots,this paper discusses systematically two qualitative posi-tioning methods—Sequence Region Positioning & Orientation Region Posi-tioning,their own properties and mutual relations,while the experimentresults are also presented. Related Articles | Metrics

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COMPRESSION AND CALCULATION OF BRANCH METRIC IN HARDWARE IMPLEMENTATION OF VITERBI DECODER Xiao Ren (Beijing Institute of Satellite Information Engineering) 1992, 12 (04):  10-18.  Abstract ( 1630 )   Save This paper takes engineering implementation as a goal,anddeals mainly with the compression of the blanch metric in the hardwareimplementation of 8-level (3-bits) soft-decision Viterbi decoder for theR=1/2,K=7 convolutional code. This paper presents a solution to theproblem and the experiment data of the Viterbi decoder prototype. Related Articles | Metrics

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RESEARCH ON APPLICATION OF REMOTE SENSING IMAGE PROCESSING TO OIL AND GAS EXPLORATION Wang Yanguang (Beijing Institute of Satellite Information Engineering) 1992, 12 (04):  19-25.  Abstract ( 1709 )   Save This paper summaries the work that has been done since 1987.It gives the background and principle of the research,the key image processingtechnique,main achievement and the prospects in remote sensing oil & gasexploration. It points out that the processing technique is a hi-tech with agreat future,all the technigues used in the research can be widely appliedto mineral resource exploration,and the final results were completed bycomputer. Related Articles | Metrics

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SPECTRAL SHAPING AND PHASE EQUALIZATION TECHNIQUES FOR SCPC SATELLITE COMMUNICATION SYSTEMS Gao Wei (Xi'an Institute of Space Radio Technology) 1992, 12 (04):  26-32.  Abstract ( 1705 )   Save Based on development of SCPC earth station in the specialsatellite communication network of the aerospace systems,the spectralshaping and phase equalization techniques are described in this paper,which are effective on compressing transmission spectrum and reducingintersymbol—interference (ISI).The measurement and operation show thatthe techniques have the evident advantage to improving the spectral effi-ciency and bit error rate performance of the system. Related Articles | Metrics

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STUDY ON LIGHTWEIGHT MIRROR OF SPACE DETAIL RECONNAISSANCE CAMERA Fu Danying (Beijing Institute of Space Machine and Electricity) 1992, 12 (04):  33-38.  Abstract ( 1654 )   Save In this paper,analysis process is introduced in which mathe-matics models of finite element method based on several lightweight pro-jects are built up and a computational analysis of stiffness under the self-weight load condition is carried on so as to obtain the distribution andvariation of the deformation field,and finally an optimum synthesis pro-ject is defined on the premise of lightest structure weight which satisfiesthe requests of mechanical,optical performances and processing technology. Related Articles | Metrics

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ANALYSIS AND DESIGN OF A CONTROL SYSTEM FOR A SATELLITE WITH FLEXIBLE SOLAR PADDLE Hou Jianwen (Shanghai Institute of Satellite Engineering) 1992, 12 (04):  39-48.  Abstract ( 2755 )   Save The influence of a kind of satellite solar paddle structureflexibility on the satellite control system stability is analyzed.Simulationand design methods of the flexible control system are given.Test resultsshow that reasonable design can reduce the influence of flexibility on thestability of satellite attitude control and increase the control accuracy. Related Articles | Metrics

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A MODEL FOR INTERFACIAL CHEMICAL BINDING ENHANCEMENT OF THIN FILM BY MeV ION IRRADIATION Yang Dequan (Lanzhou Institute of Physics) 1992, 12 (04):  49-54.  Abstract ( 1643 )   Save Theortical model,based on concepts of the formation of newinterfacial bonds,for the adhesion enhancement of thin film induced byMeV ion irradiation have been proposed in this paper.A new analyticalrelationship of the threshold doses,including ion track density,electronicstopping power and interfacial bond energy etc.has been given.It is foundthat the calculating results by using the model is in good agreement withthe experiment results reported by literatures. Related Articles | Metrics

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DISTRIBUTION OF FAILURE MODE AND MECHANISM FOR SATELLITE—BORNE SEMICONDUCTOR DEVICES Xia Hong Jiang Lidong Dai Jun Yao Jianting (Beijing Institute of Satellite Enviroment Test Engineering) 1992, 12 (04):  55-58.  Abstract ( 1760 )   Save Based on a few hundreds failure analysis reports completedwithin the period of 1987 to 1990 by Electronic Components ReliabilityCenter,CAST,MAS,a number of distribution patterns of pre—dissectionfailure modes and failure mechanisms for satellite—borne semiconductordevices have been obtained. The relevant percentages for failure modes are:logic out of control 36.3%,open circuit 22.2%,ect. The relevant percenta-ges for failure mechanisms are:aluminium corrosion 16.3%,mi(?)use 14.6%,ect.For the first time this work points out entirely and systematically thefailure modes and failure mechanisms for satellite—borne devices,wherebyprovides important basis for taking measures in satellite reliability designand optimally selecting devices and manufacturers. Related Articles | Metrics

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EMISSIVITIES OF CYLINDRO-INNER-CONES WITH A CONE OPENING Zang Weiguo (Beijing Institute of Satellite Environment Test Engineering) 1992, 12 (04):  59-66+73.  Abstract ( 1673 )   Save A mathematical model is presented for the local hemisphericaleffective emissivities of isothermal and non-isothermal cylindro-inner-coneswith a cone opening by application of the stokes theorem and contour inte-gration on the assumption that the emission and reflection are diffusive.Aprecise calculation is made for a blackbody. Related Articles | Metrics

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PROGRAMMABLE MEMORY APPLICATION IN SIMULATION SIGNAL SOURCE OF ON-BOARD SATELLITE TELEMETRY Song Liding (Yantai Inst.of Telemetry Technology) 1992, 12 (04):  67-73.  Abstract ( 1972 )   Save In the paper a new telemetry simulation signal source systemwhich consists of E~2PROM (Electrically Erasable Programmable only Me-mory) and some auxilary circuits are introduced.Firstly,according to thesignals needed by the telemetry system,the system makes programming oncomputer and generates telemetry simulation data and data format by meansof CAD.Then E~2PROM programming card writes E~2PROM the simulationdata and data format.This system implements programmable design and au-tomatic generation of telemetry simulation data stream. In fact it has beenshown that the system can overcome traditional complexity poor generalityand difficulty in modification of data and format in data stream;in addi-tion,the reliability and stability of data stream are improved largely.Itcan be used in telemetry system better. Related Articles | Metrics

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A STUDY ON SPF TECHNOLOGY FOR THIN CORRUGATED PLATE OF TB2 TITANIUM ALLOY Kan Guoli (Beijing Spacecraft) 1992, 12 (04):  74-78.  Abstract ( 2364 )   Save This paper discusses the technology for the SPF of the TB2(Ti-5Mo-5V-8Cr-3Al) titanium alloy in corrugated plate (t=0.25mm) anelement of spacecraft structure. The paper includes the discussion of theparameters of forming process and experimental equipment.The resultsshow that rough grain plate of TB2 titanium alloy has good superplasticityat 750±10℃ when no treatment of refined structure is done.Because of thedynamical recrystallization during SPF,the grain becomes smaller.Also,both the strength (σ_b) and the plasticity (δ) are better. For the thin corrugatedplate of TB2 titanium alloy,forming dies made of strainless steel(1Cr18Ni9Ti)and its plane sealing structure can meet the practical demand of SPF. Related Articles | Metrics