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25 August 2000, Volume 20 Issue 04 Previous Issue    Next Issue

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Finiteness of Singular Points in a Certain Kind of Single Gimbal Control Moment Gyroscope Systems Wu Zhong Wu Hongxin (Beijing Institute of Control Engineering,Beijing 100080) Chou Wusheng (Beijing University of Aeronautics and Astronautics,Beijing 100083)$$$$ 2000, 20 (04):  .  Abstract ( 1735 )   Save Single Gimbal Control Moment Gyroscopes (SGCMGs) are torque produ cing devices which are internal to a spacecraft and operate based on principles of momentum exchange.Normally,three or more SGCMGs are used in the spacecraft in order to realize 3 axis control.However,SGCMG systems do suffer from a serious drawback-singularity sometimes,and can not produce desired control torque when many SGCMGs work coordinately.In order to avoid system singularity,distribution of singular points must be studied in gimbal space for SGCMG systems.In this paper,it is proved that the correspondent singular points in gimbal space are finite to any point in angular momentum space for redundant systems which axes are mounted non coplanarly,pyramidally and symmetrily. Related Articles | Metrics

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Dynamics Analysis of the Satellite Power System Wang Yongqian Hu Qizheng Han Guojing (Beijing Institute of Spacecraft System Engineering,Beijing 100086) 2000, 20 (04):  .  Abstract ( 1642 )   Save The small signal AC models of the shunt,the battery charge regulator (BCR) and the battery discharge regulator (BDR) are developed.The equations and me thods for computing the bus dynamics are derived.A power system example is analyzed in terms of this method.In addition,the power system is also simulated by PSIM power simulation software for verifying the theoretical method. Related Articles | Metrics

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Data Fusion Method on Orbit Determination Using GEOSTAR System Zhou Hongchao Wang Zhengming (National University of Defence Technology,Changsha 410073)$$$$ 2000, 20 (04):  .  Abstract ( 1670 )   Save A third positioning parameter is requisite for GEOSTAR system.GEOSTAR system and multiple existent shooting range tracking system are synthesized.By applying data fusion method,positioning and speed parameters are achieved.Meanwhile,system error of GEOSTAR and shooting range tracking system are presented.Theoretical analysis and simulation calculation prove that the method is more precisive. Related Articles | Metrics

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The Simulation Test for Gauging Liquid Propellant Remaining on a Satellite Zhang Tianping Da Daoan Cheng Bin Li Yuhong Liu Zhidong Huo Hongqing (Lanzhou Institute of Physics,Lanzhou 730000)$$$$ 2000, 20 (04):  .  Abstract ( 1851 )   Save The ground simulation test for gauging liquid propellant remaining on a satellite is introduced.The test results obtained from the isothermal model are presented in details,mainly including the transient characteristics of the pressure and temperature,the measurement accuracy and its relation with other factors.The possibility that the accuracy is better than 1% of the total tank volume is indicated,and some related problems are discussed. Related Articles | Metrics

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An Object-Oriented Analysis Method for Liquid Rocket Engine System Huang Weidong (Naval Academy of Aeronautical Engineering,Yantai 264001) Wang Kechang Chen Qizhi (National University of Defense Technology,Changsha 410073)$$$$ 2000, 20 (04):  .  Abstract ( 1690 )   Save An object oriented analysis method for liquid rocket engine system is stu died ,and the concepts and structure of three types of generalized components named as function component,checking component and system regulator are presented.The proces ses of dividing up and sequential calculation for the actual system are described,and the mathematical description of the method is given clearly.Applying the method to engine configuration study,the general methods for engine cycle power balance calculation and static characteristic analysis are established,and the methods are also achieved by object oriented programming.The engine configuration can be analyzed accurately and quickly with these programs. Related Articles | Metrics

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Design of Combinatorial Countering Algorithm for Selecting Positioning Constellations Liu Huijie Zhang Naitong (Harbin Institute of Technology Communication Research Center,Harbin 150001)$$$$ 2000, 20 (04):  .  Abstract ( 1810 )   Save Data processing technologies are studied for satellite positioning system receiver,The optimal selection of positioning constellations is presented.That is a combinatorial optimization problem.Through further analysis,a m sequence based combinatorial countering algorithm is designed.Simulation and analysis is given for the algorithm result,Finally,the conclusion is provided. Related Articles | Metrics

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Effect of Spectral Bandwith in Infrared Earth Sensor on Design of Infrared Bandpass Filter for Satellite Huang Xingeng (Beijing Institute of Control Engineering,Beijing 100080)$$$$ 2000, 20 (04):  .  Abstract ( 1709 )   Save Based on the film system design of infrared bandpass filter for satellite, analyzes the effects of different spectral bandwith in earth sensor on absorption and transmitted of Ge substrate and PbTe cladding material,and on equivalent index of refraction and reflectance loss of filter film system.The result of the design is given.Best spectral bandwith of earth sensor for satellite is proposed. Related Articles | Metrics

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The Method of Radio Wave Refraction Correction in Movable Radar System Zhang Yu (China Research Institute of Radiowave Propagation,Xinxiang 453003) 2000, 20 (04):  .  Abstract ( 1746 )   Save The radio wave refraction correction for improving the accuracy of the na vigation and location is necessary.Both the quick algorithm of radio wave refraction correction by the ground meteorological parameters and its accuracy are presented and checked for movable radar svstem,respectively.It proves that ray dray mark method can be replaced by the quick algorithm above 4 degree.The problem of the non quick correction and low accuracy for movable radar system are resolved. Related Articles | Metrics

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The Feasibility of Determining the Orbit of Geostationary Satellites Using GPS Yu Jianglin Liu Dongsheng (Beijing Institute of Satellite Information Engineering,Beijing 100080) 2000, 20 (04):  .  Abstract ( 1874 )   Save The several methods of determining the orbit of geostationary satellites using GPS are summarized.The calculation demonstration is carried out according to the method of determining the orbit of geostationary satellites which only receive the signals transmitted by the GPS constellations.The availability of GPS for geostationary satellite in one period of 24 hours is obtained after computation,and the availability under different conditions is discussed.Upon analyzing the availability of GPS,a method is proposed to determine the orbit of geostationary satellites using GPS. Related Articles | Metrics

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Dynamics Analysis of Lager Spacecraft With Deploying Flexible Appendages Ma Xingrui (China Aerospace Science and Technology Corporation,Beijing 100830) Wang Tianshu Wang Benli Kong Xianren (Harbin Institute of Technology,Harbin 150001) 2000, 20 (04):  .  Abstract ( 1710 )   Save The several important problems such as deployment procedure of flexible appendages on complex spacecraft are analyzed,and corresponding programme and application software are introduced.Appendages deployment is analyzed by numerical simulation.The contents including attitude motion,attitude velocity,deployment and vibration of flexible appendages etc are discussed. Related Articles | Metrics

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Research on Buffer Performance Parameters of Docking Mechanism Influence on Docking Process Guan Yingzi Cui Naigang (Harbin Institute of Technology,Harbin 150001)$$$$ 2000, 20 (04):  .  Abstract ( 1768 )   Save The nature of buffer system is very important factor to determine the dynamic properties of the success of docking operation in space.Due to lack of the experiment equipments,the dynamic simulation on computer is an effective method to test and verify the parameters or evaluate the performance of the buffer system designed.In this paper,for the androgynous and peripheral type docking mechanism with electromechanical buffer system,the influence of the buffer system on the docking process is studied in help of the dynamic simulation in detail.The conclusion provides basis of the engineering design of the buffer system. Related Articles | Metrics