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25 December 1991, Volume 11 Issue 06 Previous Issue    Next Issue

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FURTHER DISCUSSION ON OPTIMAL TRANSFER BETWEEN TWO CIRCULAR ORBITS BY DUAL IMPULSE Li Dayao (Beijing Institute of Space Machine and Electricity) Li Dazhi (Nantong Medical college) 1991, 11 (06):  1-10.  Abstract ( 1690 )   Save This paper deals with the optimal transfer between two circularorbits by dual impulse according to the theory of optimization.The mathe-matical formulation and the solving equations of this problem are given.Solutions for several special examples are obtained. Related Articles | Metrics

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STUDY ON LIGHTWEIGHT MIRROR FOR SPACE OPTICAL INSTRUMENT Pei Yuntian (Shanghai Institute of Technical Physics,Chinese Academia of Science) Liu Zhengxing (Shanghai Traffic University) 1991, 11 (06):  11-16.  Abstract ( 1848 )   Save The necessity of lightening the weight of the mirror for spaceoptical instrument is stated in this paper.The selection of material andstructure of lightweight mirror is also discussed.The deformation oflightweight mirror resulting from the external forces acting on it iscalculated using the finite element method.Finally the performances of theweight-lightened mirror are described. Related Articles | Metrics

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ANALYSIS AND SIMULATION OF NONLINEARITY OF TRANSPONDER ON BOARD GEOSTATIONARY METEOROLOGICAL SATELLITE Zhang Wei Jia Qing (Xian Institute of Space Radio Technology) 1991, 11 (06):  17-26.  Abstract ( 1643 )   Save This paper presents analysis of nonlinearity and its resulitedintermodulation(IM)effect of the amplifier of the satellite transponder.Polynomial approximation and Artificial Neural Network(ANN)simulationdata have been obtained from the singlecarrier power transfer curve of thetested amplifier.Comparisons have been made between the results,showingthat the nonlinearity analysis and simulation method presented in thisarticle using ANN concept is of theoretical importance and practical valueto the nonlinear problem resolution. Related Articles | Metrics

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SURVEY ON COMPENSATION METHOD FOR SYSTEMATIC ERRORS OF LARGE REFLECTOR ANTENNA Qi Yihong (Southeast University,Nanjing) Li Yinghong (Xian Inst.of Space Radio Engineering) Xu Guohua Song Guoxiang (XIDIAN University) 1991, 11 (06):  27-31.  Abstract ( 2136 )   Save This paper briefly describes the concept of systematic errorsand random errors for reflector antenna.Two kinds of compensation methodfor large reflector antennas are introduced,i,e,the array feeds compen-sation method and the refocusing and subreflector matching method.The keypoint of mechano-electrical unification design for reflector antennas is brie-fly described. Related Articles | Metrics

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POSSIBILITY OF FLYING DIRECTLY INTO INTERPLANETARY TRANSFER ORBIT FROM SPACE STATION Zhu Renzhang (Beijing Institute of Spacecraft Systems Engineering) 1991, 11 (06):  32-36+10.  Abstract ( 1799 )   Save With development of the space technology it is possible toapply the space station as a launch base for spaceerafts of interplanetaryflight.From the point of view of energy requirement it is of benefit to makefull use of the hyperbolic velocity excess to put the spacecraft directly intothe transfer orbit for the other planet after the spacecraft takes off fromthe space station and flies away from the orbit of space station. Related Articles | Metrics

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STATISTICAL ANALYSIS OF RELIABILITY OF DAM BEARINGS FOR TEN-YEAR SIMULATION TEST Huang Kewei (Lanzhou Institute of Physics) Wang Chengwei (Northwest Normal University) 1991, 11 (06):  37-44.  Abstract ( 1647 )   Save A ten-year life test of DAM bearings was finished in highvaccum.The paper analysed the reliability of DAM bearings according tothe long term test,and gave some statistical results of reliability of themwith different reliable lifes and confidence levels. Related Articles | Metrics

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IMPROVED EXPERIMENT USING SIMULTANEOUS PHYSICAL RETRIEVAL METHODS Li Guangqing Zhang Wenjian Dong Chaohua (Satellite Meteorology Center,Beijing) 1991, 11 (06):  45-50+44.  Abstract ( 1646 )   Save Simultaneous physical retrieval methods(SPRM)is one of themost prevalent methods in satellite atmosphere remote sensing in U.S.A..It has been getting perfect with the advance of the development in theoryand practice.Our numerical comparison test is to fit it in satellite dataretrieval process and in application of meteorological operation and scienti-fic studies.It can be simply called an improved SPRM(ISPRM).The ac-curacy of ISPRM is obviously better than the SPRM's,demonstrated by alot of retrieval test results of NOAA-10 meteorological satellite soundingdata. Related Articles | Metrics

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LABORATORIAL INVESTIGATION ON EFFECT OF OXYGEN PLASMA ON SPACE MATERIALS Yu Zhizhan Wang Jingyi Zhang Jingqin (Lanzhou Institute of Physics) 1991, 11 (06):  51-56.  Abstract ( 1822 )   Save Tests of some space materials on resistivity against atomicoxygen were carried out by using our radio frenquency oxygen plasmareactor.These materials involves aluminized kapton,polytetrafluoroethylene,polyester film,polyimide,silastic,carbon/epoxy composite,kevlar,as well asAg,Cu,Al foid and optical solar reflector.Mass loss rate,surfacespecific resistance,solar absorptivity(α_s)and infrared radiance(ε)afteroxygen plasma exposure were measured.Furthermore,experimental resultsand feasibility were discussed. Related Articles | Metrics

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SPACE BLOOD STASIS AND IT'S COUNTERMEASURE Shen Xianyun (Institute of Space Medico-Engineering,Beijing) 1991, 11 (06):  57-61+56.  Abstract ( 1846 )   Save According to experimental results and related oversea materials,this paper proves that the disorder of blood circulation of humanand animal during weightlessness and simulated weightlessness is verysimilar to the changes accompanied by the discase called“blood stasis”in Chinese medicine.The writer puts forward the opinion that the Chinesemedicine herbs used to invigorate the blood circulation and eliminate theblood stasis have great capability to prevent the blood circulation disorderduring space flight. Related Articles | Metrics

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METHODOLOGY STUDY ON TRANSFORMATION OF DATA BASE STRUCTURE AND DATA Shan Heqing (Beijing Institute of Satellite Information Engineering) 1991, 11 (06):  63-67.  Abstract ( 1611 )   Save This paper presents the transformation programs of bothstructure and data of the relational data base system on microcomputer tothose on UNISYS 2200/401 and on MAPPER.The paper focuses on realization methods,design strategies as well astechnical routes and difficulties.Finally system construction,system functionand outline diagram are given. Related Articles | Metrics