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25 June 1990, Volume 10 Issue 03 Previous Issue    Next Issue

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FITTING TECHNICS OF ADJOINT ORBIT Fan Jianfeng (Beijing Institute of Spacecraft Systems Engineering) 1990, 10 (03):  1-6.  Abstract ( 1737 )   Save Adjoint orbit of spacecraft can perform various specific missions. This paper presents a method by using of which the orbital elements of two spacecrafts can be determined by an adjoint orbit. Also, this method can be used to the condition of multi-spacecraft. Related Articles | Metrics

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EFFECT OF CO-CHANNEL INTERFERENCE ON A CARRIER TRACKING LOOP AND TELEMETRY SUBSYSTEM Xu Dingfu Zhang Bo (Luoyang Institute of Tracking Telemetry and Telecommunication) 1990, 10 (03):  7-21.  Abstract ( 1966 )   Save This paper discribes the effect of co-channel interference on the ground TT&C station between satellite-ground links.The effect of interference on a Carrier-to-Tracking Loop (CTL) is analysed, and the critical value is determined under the tracking condition of CTL.The analysis of the effect of interference on a telemetry demodulation subsystem is emphasized. The interference has an effect on the Bit-Error-Rate (BER) by two ways. On the one hand, the reference phase jitter caused by a carrier recovery loop will have an indirect effect on BER. On the other hand, the interference introduced directly into a coherent detection device will directiy give raise to increase BER.The results of the effects can be expressed in terms of the loss of input Signal-to-Noise ratio E_b/N_0 at the same BER. Related Articles | Metrics

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SELF-EQUALIZED PSEUDOELLIPTIC FILTER Wu Xuda (Xi'an Space Institute of Radio Technology) 1990, 10 (03):  22-27.  Abstract ( 2131 )   Save A general design procedure is presented for self--equalized pseudoelliptic filter used for communication satellite in a 8--pole asymmetric dual mode in-line configuration the filter realized useful transmission characteristics with a transmission zero pair at real and imaginary axes. Therefore, there is a perfect compromise between attenuation in stopband and group delay or loss variation in passband. The measured performaces of laboratory model filter are given indicating that the expected design object is achieved. Related Articles | Metrics

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SCIENTIFIC AND TECHNICAL STRATEGY TO SPEED UP APPLICATION OF METEOROLOGICAL SATELLITE IN CHINA Fan Tianxi Niu Yinsheng (Satellite Meteorological Center) 1990, 10 (03):  28-33.  Abstract ( 1646 )   Save In the 1990's, it is of great meaning and benefit to speed up the application of meteorological satellite in China. The ideas which relate to the scientific and technical strategy to be taken for developing the application of meteorological satellite are proposed in this paper. A series of research subjects and critical technical problems which need to be solved are also proposed. Related Articles | Metrics

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NICKEL-CADMIUM BATTERY FOR CHINA'S COMMUNICATIONS SATELLITE Liu Linhui Sun Yanbao (Tianjin Institute of power Sources) 1990, 10 (03):  34-41.  Abstract ( 1648 )   Save This paper discusses the main problems of Ni-Cd cell, such as leakage at ceramic-metal seal,factors effecting on the specific energy density, choice of separator and the cadmium electrode. On the basis of that mentioned above, the design of combined battery, the design of shelf battery, use of the carbon-fibre material and technology in charge controlling are discussed. Related Articles | Metrics

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USING INTEGRAL TELEMETRIC DATA OF ACCELEROMETER TO CALCULATE TRAJECTORY PARAMETERS AND ORBITAL ELEMENTS Wang Guangmin (Beijing Aerospace Automatic Control Institute) 1990, 10 (03):  42-48.  Abstract ( 2071 )   Save This paper presents a calculation method by utilizing telemetric integral data of accelerometer about some particular points (such as cutoff point, orbit injection point etc) of launch rocket to calculate trajectory parameters and orbital elements of such points. Related Articles | Metrics

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STUDY OF CHARGING CHARACTERISTIC OF KAPTON AND FEP TEFLON Lu Yusun Li Hua (Lan zhou Institute of Physics) 1990, 10 (03):  49-55.  Abstract ( 1666 )   Save Kapton and FEP Teflon are the important materials of the thermal control of spacecrafts.They are the Orgenic Polymer,which have the excellent physical and chemical properties. However, the charging phenomenon appear on their surface in substorm at high orbit owing to the high insulation of these matersals. So, in this article, the results of evaluation tests of their conductivities in simulated space conditions have been described. And the charging state in orbit can be expected by these regular results. Related Articles | Metrics

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POSSIBILITY OF USING SURFACE MOUNT TECHNOLOGY AND CHIP COMPONENT IN SPACE APPLICATION Dong Weifang (Xian Space Institute of Radio Technology) 1990, 10 (03):  56-59+55.  Abstract ( 1499 )   Save This paper gives a brief introduction to surface mount technology and chip Components; According to Satellite's feature, this paper discusses the necessity and possibility of use of surface mount technology and chip component in space electroni equipments. Related Articles | Metrics

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A FUSE AVAILABLE TO DEVICE IN SATELLITE Xue Datong Ding Tianbao (Lanzhou Institute of Physics) 1990, 10 (03):  60-66.  Abstract ( 2110 )   Save For the purpose of being used in satellite, the authors have improved a type of fuse (Model RF2-9-0.2A) that looks like a resistor. Then a careful observing of fusing process was made, under the condition of being used in satellite we took the environmental experiments and life test. The results show that when used at half of the specified current, the improved fuses are able to satisfy the reliability required of satellite. The conditions of microgravity and vacuum would not affect it's fusing property largely. The fusing current of the fuse-wire is less than the specified value of the battery, cable and connecting element in satellite. If the problem that the heated fuse-wire touches the inner surface of the porcelain tube is solved, the fusing property will be improved further. Related Articles | Metrics