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25 October 1988, Volume 8 Issue 05 Previous Issue    Next Issue

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CALCULATION OF FAR FIELD OF LINEAR ANTENNA ON SPHERICALLY SHAPED SATELLITE Wang Jueqi WuWenliang (Institute of Space(?)raft System Engineering) 1988, 8 (05):  .  Abstract ( 1661 )   Save In this paper the far field of linear antenna on spherically-shaped satellite is calculated, and the effect of sphere radius, antenna height and operating wavelength on the pattern shape, especially the position of pattern maximum is analyzed. Related Articles | Metrics

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COMPUTATION OF AERODYNAMIC MOMENT OF CONVEX BODIES USING SCHAMBERG MODEL Li Dayao 1988, 8 (05):  .  Abstract ( 1852 )   Save The particle-surface interaction model in "hyperthermal free-molecule flow" postulated by Schamberg has been used to calculate drag coefficient of convex bodies.This paper further gives calculation formulas of aerodynamic moment of convex bodies using this model and proposes a functional expression of relationship between the half-angle of beam φ_0 and the angle ofincidence θ_i. Related Articles | Metrics

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ANALYSIS OF THE GEOMLTRIC DISTORTIONS ON SATELLITE PANORAMIC IMAGES He Zhiqin Meng Bo (Beijing Institute of Satellite Information Engineering) 1988, 8 (05):  .  Abstract ( 1399 )   Save Factors which influence the geometric precision of satellite panoramic images, such as, the errors of satellite state parameters, the errors of orbit parameters, and the differences of elevation on the ground, are disscussed, and the mathematic methods to calculate the effect of all the errors mentioned above are given in the paper. Related Articles | Metrics

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ANALYTICS ON THE TRANSIENT TEMPERATURE FIELD OF SATELLITE Pan Zengfu (Beijing Institute of Spacecraft System engineering) Ma Shiming (Beijing Institute of Satellite Information Engineering) 1988, 8 (05):  .  Abstract ( 1473 )   Save The several typic transient temperature problems in the thermal design of a geostationary communication satellite are discussed in this paper. Stiff steady auto-integration is used to solve 250 nodes nonlinear differentiating equations. A good result has been obtained applying the technique of sparse matrix to corrected iteration procedure. Related Articles | Metrics

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THE BANDWIDTH ANALYSES OF LOG—ANTILOG CONVERTER WITH AC TO DC Du Zhong (Beijing Institute of Control Engineering) 1988, 8 (05):  .  Abstract ( 2138 )   Save Taking the fundamental principle of log-antilog true rms-responding ac-to-dc converters as the starting point, the paper points out that the bandwidth of the operational amplifier in input log converter is frequently the primary source determining the upper limit on the ac-to-dc conversion bandwidth, and from the theory, drawing the formula of the bandwidth of the converter.The work has important significarce for the research of high precision DMM. Related Articles | Metrics

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COST ANALYSIS OF TELECOMMUNICATION SATELLITE Zhu Yilin (Beijing Institute of Spacecraft Systems Engineering) 1988, 8 (05):  .  Abstract ( 1575 )   Save This paper proposes a model for estimating the cost of sub-systems of a communication satellite.Thus it allows to estimate the cost of the spacecraft and the total space segment. In order to estimate the cost of subsystems, the paper presents at first a model for mass distribution of subsystems.Examples of calculating these costs are also presented. Related Articles | Metrics

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DANGER TO ELECTRICAL EQUIPMENT OF SYNCHRONOUS SATELLITES DUE TO CHARGE/DISCHARGE EMP AND THEIR PROTECTION Chen Guozhen (Beijing Institute of Spacecraft System Engineering) 1988, 8 (05):  .  Abstract ( 1922 )   Save In order to provide a reference for scientific workers related, the folio- wing aspects about charge/discharge of synchronous satellites are brieflyreviewed: 1. Test about charge/discharge; 2. Danger to electrical equipments due to dischange EMP; 3. Protection methods used for reducing the danger; 4. Simulating test for certification. Related Articles | Metrics

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SEQUENCE ELIMINATION ITERATION ALGORITHM IN CALCULATION OF TRAJECTORY TRANSFER Fei Jinggao (Beijing Institute of Computer Application and Simulation Technology) 1988, 8 (05):  .  Abstract ( 1718 )   Save For an example of calculation of missile flight trajectory transfer, this paper gives the general principle of construction of the Sequence Elimination Iteration Algorithms, Practical algorithms and some computation result.The reason of successful using and some variants of the algorithm are also given. Related Articles | Metrics

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CHARACTERISTICS OF SLANT PATH RAIN ATTENUATION AND ITS POSSIBLE INFLUENCE ON SATELLITE SYSTEM DESIGN Wang Jiasheng (Institute of Spacecraft Systems Engineering) 1988, 8 (05):  .  Abstract ( 3886 )   Save The main factors influencing on slant path rain attenuation are summarized.Using the experimental data obtained in Beijing, the characteristics of slant path rain attenuation in Beijing area are analysed.Some suggestions about choice of the stationary position of communication satellite and the position of transmitting station in Beijing are made. Related Articles | Metrics