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25 October 1992, Volume 12 Issue 05 Previous Issue    Next Issue

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STRATEGY FOR 0-LEVEL DATA GEOMETRIC RECTIFICATION Deng Guanglin Shao Meizhen (Information Engineering Institute of the PLA,Zheng Zhou) 1992, 12 (05):  .  Abstract ( 1780 )   Save Satellite attitude control parameters are needed in systematic correcting 0-level data.With enough satellite ephemeris parameters 1-level data can be got by systematic correction. In practice,it may be happened that satellite ephemeris parameters are not enough or almost none. In this paper,a new method for processing 0-level data is given.The method only uses image's inter-continuity and relativity,without any satellite ephemeris parameters.The processing results are satisfactory. Related Articles | Metrics

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ESTIMATION OF ENVIRONMENTAL FACTORS WITH INVERSE GAUSSIAN DISTRIBUTION Wang Hongzhou Ma Baohua Shi Jusheng (Beijing Institute of Technology) 1992, 12 (05):  .  Abstract ( 2217 )   Save In this paper,environmental factor estimation for the inverse Gaussian distribution with two parameters is studied and two definitions of environmental factors with inverse Gaussian distribution are proposed.Based on the above definition,the Bayesian confidence limits of the inverse Gaus- sian environmental factor are also given respectively using non-informa- tive reference prior distribution as well as the natural conjugate prior dis- tribution.An application of these results is provided. Related Articles | Metrics

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THE SYSTEM MANAGEMENT PROGRAM IMPLEMENTATION OF A RECONFIGURABLE DOUBLE-COMPUTER SYSTEM AT MODULE LEVEL Wang Shuhua (Beijing Institute of Control Engineering) 1992, 12 (05):  .  Abstract ( 1506 )   Save This paper analyses the active state number of a double-computer system which is reconfigurable at module level and compares it with other redundance configuration computer system which are spare standby at system level.The results show that the lower the redundance level is,the higher the reliability is,and the larger the active state number is. It will increase the complexity of management software. This paper introduces the design principles of management software and briefly discribes the features of some subroutiness Related Articles | Metrics

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TECHNIQUES FOR DEVELOPMENT THE CARBON/EPOXY STRINGER PREFORMS OF A CORRUGATED CYLINDER FOR SATELLITES Shi Young (Beijing Spacecrafts) 1992, 12 (05):  .  Abstract ( 1734 )   Save This paper disscuses the development of carbon/epoxy stringer preforms of a corrugated cylinder for a certain type of satellite.The change of the property of the resin matrix during curing process is studied by using a method called Dynamic Dielectric Analysis (DDA) to determine the optimum technological parameters for prebleeding of the prepreg and the precompaction of the preforms.The curing degree of the preforms is also determined using the dielectric loss curves. The forming of the preforms are carried out on a soft-hard sectional die and the preforms developed satisfy the requirements of the manufacture of the carbon/epoxy corrugated cylin- der which has passed the ground mechanical tests later. Related Articles | Metrics

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RADIATION CALIBRATION OF SCANNING RADIOMETER FOR METEOROLOGICAL SATELLITE Zhu Guangze (The Moteorology Satellite Center,SMA) 1992, 12 (05):  .  Abstract ( 1844 )   Save The radiation calibration of scanning radiometer for the meteo- rological satellite is stated in this paper,including the pre-launch calibra- tion,in-flight calibration and the absolute calibration through comparison between the data ground measured and the data transmitted from the satel- lite.It is commemted that the calibration for visible waveband can not yet be used for operation satellite currently and is in research stage still. The ra- diation calibration for geostationary satellite can only be relative one.There- fore we must find an objective target as a calibration source to resolve the problem of absolate calibration.In this way the data transmitted from satel- lite will be effective even if the calibration equipment on the satellite is failed. Related Articles | Metrics

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DEVELOPMENT OF METEOROLOGICAL SATELLITE He Zhenghua (Shanghai Institute of Spacecraft Engineering) 1992, 12 (05):  .  Abstract ( 1662 )   Save This paper sets forth the function of meteorological satellite, the features of the polar orbiting and the geostationary satellite as well as the interdependant relation between them. The features and trend of the evolution of foreign satellites are reviewed. An idea for development of chinese meteorological satellite till the early of the next century are recommended. Related Articles | Metrics

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A METHOD OF HIGHER ORDER ACCURAY FOR GENERAL NONLINEAR BOUNDARY VALUE PROBLEMS Zhou Baomin (Beijing Institute of Satellite Information Engineering) 1992, 12 (05):  .  Abstract ( 1628 )   Save We present a sixth-order finite difference method for the gener- al second-order nonlinear differential equation y″=f(x,y,y′)subject to the boundary conditions y(a)=A,y(b)=B.We establish,under appropriate con- ditions,0(h~6)-convergence of the finite difference scheme.Numerical exam- ples are given to illustrate the method and its sixth-order convergence. Related Articles | Metrics

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NO-POLLUTANT EXPLOSIVE BOLT FOR SATELLITE Wang Chuanke (Beijing Institute of Spacecraft Systems Engineering) 1992, 12 (05):  .  Abstract ( 1663 )   Save This paper presents the design process of no-pollutant explo- sive bolt for satellite,including structure principle,design calculation and determination of pollution volume. Related Articles | Metrics

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ANALOGIC EFFECT OF LOW VACUUM AND MICROGRAVITY ON NATURAL CONVECTIVE TRANSFER OF HEAT IN GASES IN SPACE DEVICES Xi Risheng Wang Kang (Lanzhou Institute of Physics) 1992, 12 (05):  .  Abstract ( 1899 )   Save The problem of natural convective transfer of heat in gases in space devices is taken to be an objective. The Rayleigh number and Knud- sen number,which are obviously expressed as the function of temperature and pressure,two independent parameters of thermodynamics,are derived. The different situation of gaseous transfer of heat in each characteristic pressure section is analyzed. The analogic effect of low vacuum and microgravity on natural convective gaseous transfer of heat in the continuous medium flow in space devices is compared. Related Articles | Metrics

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INDEPENDENT MODAL CONTROL FOR VIBRATION SUPPRESSION Li Hong (Chinese Academy of Space Technology) Yu Yunshu (Beijing Institute of Satellite Environmental Engineering) 1992, 12 (05):  .  Abstract ( 1705 )   Save The problem on vibration suppression of the cantilever beam is Independent Modal Control Method (IMSC) .The structural dynamic mo- del has been formulated for the cantilever beam bonded piezocrystal sensors and actuators.The control testing for the first bending mode of a cantile- ver beam has been performed.The experimental results indicated that the damping ratio of first bending mode is increased,damping ratios for other modes are not changed,and the system is stabilized. Related Articles | Metrics

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LOW LOSS 14/12 GHz FET MIXER Chen Mingzhang (Xi'an Institute of Space Radio Technology) 1992, 12 (05):  .  Abstract ( 1716 )   Save The principle and design method of a field effect transistor (FET) mixer are introduced. A single ended FET mixer is fabricated.The mixer operates in frenquency range 14.0～14.5/11.7～12.2GHz with-0.36dB conversion loss,5.6mW local oscillator power,less than 0.8dB loss varia- tion in 500MHz band and 14.2dB noise figure. Related Articles | Metrics