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25 August 1991, Volume 11 Issue 04 Previous Issue    Next Issue

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SPACE STATION ORBIT ALTITUDE SELECTION Fan Jianfeng (Chinese Academy of Space Technology) 1991, 11 (04):  1-8.  Abstract ( 2287 )   Save There are many factors which influence the selection of spacestation orbit,such as mission requirements,radiation environment,meteoroid/debris environment,configuration of space station,vehiclecapability,launch window and logistics demands of space station.The resupply delivery system performance for space station generally tendsto favor lower orbit altitude,but the orbit maintenance requires higher alti-tude.This paper describes the effects of resupply,orbit maintenance and solaractivity on the orbit altitude,and presents the optimum operation altitudesof space station.It's also calculated two numeral examples for mannedspacecraft delivery system and shuttle delivery system.The main conclusion is that the optimum orbit altitude of space station isnot constant.It varies with the solar activity,delivery system and trafficlevels.During period of high solar activity,the orbit altitude should be adjustedupward.As the traffic levels to space station are increased,the optimumoperation altitude should be lower. Related Articles | Metrics

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DATA-EXCHANGE TECHNIQUE BETWEEN EUCLID GRAPHIC DATABASE AND ORACLE DATABASE Yang Siyi Lin Baozhen (Beijing Institute of Satellite Information Engineering) 1991, 11 (04):  9-15.  Abstract ( 1627 )   Save In this paper point out the purpose and feasibility of the data-exchange between Euclid graphic database and Oracle database,describethe details of the technical method to realize this data-exchange,softwarefunctions and program usage,and also put out the suggestion of the furtherwork. Related Articles | Metrics

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EXTRACTION OF COLOR CONSTANCY AND HIGHLIGHT FROM COLOR IMAGE Huang Yuming (Beijing Institute of Control Engineering) Xu Guangyou (Qing Hua University) Ye Peijian (Chinese Academy of Space Technology) 1991, 11 (04):  16-21.  Abstract ( 2452 )   Save The color of certain object surface has a constant feature,irrelevant to the object surface shape.But the color of the image is variablebecause of the existence of highlights.To construct a physical modelof color reflection is a way to understand the image color correctly.Thispaper describes a method of computing light source color coordinates andobject color coordinates.Based on the Dichromatic Reflection Model proposedby Klinker et al,the method first makes plane fitting in the color cube byusing K-L transform,then separates the interface reflection componentsand body reflection components.Also the limitations of practical CCD camerasare discussed and the experiment results are presented.The color imagegiven in this paper refers to that generated by a color CCD camera frommonochromatic object under monochromatic light(not the light with singlewavelength). Related Articles | Metrics

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APPLICATION OF METEOROLOGICAL SATELLITE DATA IN MONITORING EARTH ENVIRONMENT AND NATURAL DISASTERS Xu Jianmin (Satellite Meteorology Center) 1991, 11 (04):  22-28.  Abstract ( 1684 )   Save Meteorological satellite products are broadly used in monitoringclimate,water cycle,earth environment and natural disasters.This paperbriefly introduced these products,their derivation principle and application. Related Articles | Metrics

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DEVELOPMENT AND PROSPECT OF FOREIGNE SPACEBORNE RADAR Yu Tao Ju Dehang (Xi'an Institute of Space Radio Engineering) 1991, 11 (04):  29-36+49.  Abstract ( 2719 )   Save The spaceborne radar altimeter has been developed rapidly in the world since 1970s.This paper introduces the principles and the proper-ties of radar altimeters on satellite.The studies of radar altimeter,includingits background,significance,development history and current status,aresummarized,and the prospects of the development of radar altimeter onsatellite ture are discussed at last. Related Articles | Metrics

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THERMAL VACUUM TEST OF MANNED SPACEFLIGHT He Chuanda (Beijing Institute of Environmental Test Engineering) 1991, 11 (04):  37-42.  Abstract ( 2248 )   Save The paper discussed the features and the objectives of thermal-vacuum test for manned spaceflight based on the investigation of foreignexperience,15 thermal-vacuum tests divided into three types havebeen proposed.The necessity of thermal-vacuum test on a complete mannedspacecraft is also discussed;and proposal a single module or more inconnection under the simulated environment condition both inside and outsidethe module are suggested.The paper also discussed the distinguished featureand the application of manned spacecraft thermal-vacuum tests,and thespecial devices needed for astronauts that should be attached to the satellitetest facility in order to meet manned spaceflight test requirements. Related Articles | Metrics

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THE ANOMALY ANALYSIS OF METEOROLOGICAL SATELLITE AND ENLIGHTENMENTS Xu Jianping (Satellite Meteorological Center) 1991, 11 (04):  43-49.  Abstract ( 1571 )   Save Hundreds of anomalies of meteorological satellites have beenanalyzed.The main anomalies and their causes have been sunnnaried.Thereis some enlightenment for satellite development and satellite control andoperation. Related Articles | Metrics

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TETHER DEPLOYMENT UNDER RATE CONTROL Zhu Renzhang (Beijing Institute of Spacecraft System Engineering) 1991, 11 (04):  50-55.  Abstract ( 1551 )   Save t By means of the demonstration of tether deployment fromthe geostationary orbit,the selection of the parameters in the length ratecontrol is further explained.An estimation of the tether tension is given. Related Articles | Metrics

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STRATEGY FOR IMAGE RECTIFICATION OF CHINESE RETURNABLE SATELLITE IMAGES He Zhiqin Meng Bo (Beijing Institute of Satellite Information Engineering) 1991, 11 (04):  56-60+55.  Abstract ( 1648 )   Save Since the first successful launching of Chinese Returnable Sate-llits,a series of methods have been developed to rectify the geometricdistortions of satellite panoramic images.The purpose of this paper is todiscuss the strong and weak points of these methods,to propose the improve-ment of the methods and to point out when and how to use these methods. Related Articles | Metrics

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HRPT INFORMATION SIMULATOR OF METEOROLOGICAL SATELLITE Wang Hairong Fu Pengxiang (Shanghai Scientific Instrument Factory) 1991, 11 (04):  61-66.  Abstract ( 1702 )   Save This paper describes the fundamental constitution and designmethod of meteorological satellite HRPT information simulator.Because ofthe use of large scale integrated circuit EPROM in the coder,theequipnent ischaracterized by compact construction,flexible simulation and a largeamount of information.This design method is applicable to similar informationsimulators. Related Articles | Metrics

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THERMAL CONTROL DESIGN OF RETURNABLE SATELLITE IN LAUNCHING PHASE Li XiLun (Beijing Institute of Spacecraft Systems Engineering) 1991, 11 (04):  67-71.  Abstract ( 1537 )   Save This paper discusses the problem of aerodynamics heat of non-fairinged satellite.The method of heat-inertia in launching phase,is usedin thermal control design.The theoretical data,test data and flight data are identical with eachother.It shows that the design is very successful. Related Articles | Metrics