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25 October 2002, Volume 22 Issue 05 Previous Issue    Next Issue

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External Design of Chinese Manned Spaceflight Engineering Wang Xiji (Chinese Academy of Space Technology,Beijing 100081) 2002, 22 (05):  .  Abstract ( 1522 )   Save When the aim of journey to and from between space and earth is realized in the "Shen Zhou"manned spaceship engineering,the next target of Chinese manned spaceflight will be chosen carefully.According to the needs of Chinese society ,the external social and engineering system environment of space station for utilizing space microgravity mass environment and spaceflight station Provided services for docking spacecraft are discussed.There are good basis on launch vehicle,launch and retrieval bases, and monitor stations in China.As"Shen Zhou"manned spaceship is developed,it is not difficulty to develop cargo spaceship.But the astronaut system for ensuring astronaut's life and work and valuable payload system for realizing spaceflight engineering is deficient.Now it is still in research,test,training,development and demonstration phase. Related Articles | Metrics

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Nonlinear Control Without Velocity Measurement for Satellite Formation Flying Zhang Yukun Dai Jinhai (National University of Defense Technology,Changsha 410073) 2002, 22 (05):  .  Abstract ( 1946 )   Save Based on the nonlinear model, the problem of control f or satellite formation flying is investigated. First the exact nonlinear dynamics equations of relative motion is derived. Then the control law without velocity measurement is designed based on a filter and the closed loop system is proven t o be globally asymptotically stable. At last, numerical simulation results are presented to illustrate the theoretical analysis. Related Articles | Metrics

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The Mean Orbit Elements and Its Application in the Satellite Constellation Design Wang Rui Xiang Kaiheng (Chinese Academy of Space Technology,Beijing 100086) Ma Xingrui (China Aerospace Science and Technology Corporation,Beijing 100830) 2002, 22 (05):  .  Abstract ( 1600 )   Save The mean orbit elements play an important role in sate ll ite orbit design and constellation simulation On the basis of the domestic and overseas research results,a simplified but practical mutual transform between os culating orbit elements and mean orbit elements is given,which has no singularit y The practice in the constellation design and simulation demonstrates that this method is well and truly useful By taking advantage of the mean orbit elements,an interesting result is also given about the circular orbits in the equator plane Related Articles | Metrics

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Design of Hardware Decompression System Based on RBC Algorithm Cheng Zijing Jiang Hongxu Zhou Xiaokuan (Beijing University of Aeronautics and Astronautics,Beijing 100083) 2002, 22 (05):  .  Abstract ( 1675 )   Save An image hardware decompression system based on the RBC algorithm is designed. Firstly,the decoding flow of RBC is described in this pap er. Secondly, a VLSI architecture realizing this decoding algorithm is proposed. Finally,the VLSI architecture is implemented in FPGAs,and decompression ASICs ar e produced.Test results show that the data processing speed of the hardware syst em made up of these ASICs is so fast that meet the requirement of real-time imag e decompression. Related Articles | Metrics

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Dynamical Modeling and Numerical Simulation of Hypervelocity Space Debris Impact Qu Guangji Han Zengyao (Beijing Institute of Spacecraft System Engineering, Beijing 100086) 2002, 22 (05):  .  Abstract ( 1639 )   Save The significance and development of the research relat ed to numerical simulation of hypervelocity space debris impact is elucidated. Then, the research content, the technical target and the exactly implemental approach of the numerical simulation in hypervelocity space debris impact are discussed. They provide technical basis and instructive principles for further development. Related Articles | Metrics

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Research on Realization of ASIC in Chinese Spacecraft Du Wenzhi Tan Weichi (Beijing Institute of Spacecraft System Engineering, Beijing 100086) 2002, 22 (05):  .  Abstract ( 1546 )   Save All available realization and characteristics of ASIC ar e analyzed and compared. Special demands to ASIC according to chinese spacecraft are presented in details. On analysis of feasibility of different ASIC realizat ion, suitable realization and development strategies of ASIC for Chinese spacecr aft proposed. The main questions from ASIC development in Chinese Spacecraft are presented. Related Articles | Metrics

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Outline of the System Simulation Technology for Remote Sensor in Space Xu Peng Huang Changning (Beijing Institute of Mechanical and Electronic in Space,Beijing 1 00076) Wang Yongtian Hao Qun (Beijing Institute of Technology,Beijing 100081) 2002, 22 (05):  .  Abstract ( 1692 )   Save The system simulation technology of remote sensor used i n space is described based on the research results.The image quality effected by the objects,background,environments(including the field of temperature and grav ity,vacuum,and radiation),and satellite platform is analyzed. Related Articles | Metrics

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Numerical Evaluation on the Suppression of Natural Convection Using Lowering Pressure Method Zhong Qi (Beijing Institute of Spacecraft System Engineering, Beijing 100086) Liu Qiang (Chinese Academy of Space Technology, Beijing 100081) 2002, 22 (05):  .  Abstract ( 1610 )   Save Natural convection is often practically suppressed or eliminated by lowering the cabin pressure in the ground test of spacecraft. Parameters affecting the optimum pressure are unknown in general, thus resulting in uncertainty of the effect of the suppression. The method determining the optimum pressure via numerical analysis is proposed in this paper. Spacecraft cabins on the ground with various pressures are simulated. Analytical results are compared directly with that of the cabin in orbit, thus figuring out the optimum pressure on the ground to simulate a flying cabin. Related Articles | Metrics

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Feasibility Study of Laser-Driven Debris Technique Dong Hongjian Huang Bencheng Wang Jihui Tong Jingyu Sun Gang(Beijing Institute of Spacecraft Environment Engineering,Beijing 100029) 2002, 22 (05):  .  Abstract ( 1524 )   Save The feasible test of laser-driven debris techni q ue is introduced.In the test,four bonding methods are compared,and the velocity of aluminum flyer is also measured in a vacuum chamber. Moreover the damage asse ssment on two protective materials is performed.The results of the test show it is necessary and also feasible to build a set of complete laser-driven deb ris devices on the ground. Related Articles | Metrics

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Research of Thermal Modeling Method and Temperature Prediction for Communication Satellite Platform Ma Huitao Hua Chengsheng (China Academy of Space Technology,Beijing 100086) 2002, 22 (05):  .  Abstract ( 1579 )   Save The thermal analysis is carried out for the communicatio n satellite platform.Through comparing the predicted results with the thermal ba lance test results and modifying the thermal model,the predicted results are alm ost at the ±5℃ range of the test results.So the thermal modeling met hod for the communication satellite platform is established,which can be also used as reference for other satellite platforms. Related Articles | Metrics

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Design and Analysis of Deployable Parabolic Truss-Mesh Reflector Antenna Wei Juanfang Guan Fuling (Znejiang University,Hangzhou 310027) Zhou Liping Wang Yong Liu Tianlin (Xi′an Institute of Space Radio Technology,Xi′an 710000) 2002, 22 (05):  .  Abstract ( 2342 )   Save A deployable parabolic reflector of truss mesh antenna i s described.The antenna has the characters of high deployed/stowed ratio,small a rea mass density and broadband frequency.It can be used for Synthetic Aperture R ader(SAR)antenna of small satellite and other S or L band antenna such as mobile satellite antenna.Deployable dimension of the parabolic reflector is 6m×2 8m. The frequency is S band with bandwidth greater than 100MHz.The antenna configura tions and structure design of the key parts are introduced,and the shape error a ssigning,thermal distortion and stiffness is analyzed.The test results of labora tory model show the structure design is practicable and feasible. Related Articles | Metrics

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An Availability Calculation Method for Common Using Distribution Jin Xing Hong Yanji Wen Ming Li Junmei (Institute of Command and Technology of Equipment,Beijing 101416) 2002, 22 (05):  .  Abstract ( 1641 )   Save Exponential distribution assumption is commonly used i n availability analysis of Markov models,but fault density and maintenance density of some components are not expressed by exponential distribution.Based on numer ical integral,a new availability calculation method is presented for exponential distribution,normal distribution,lognormal distribution and Weibull distributio n.The presented method can be easily used in availability analysis for engineeri ng components. Related Articles | Metrics