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    25 June 1995, Volume 15 Issue 03 Previous Issue    Next Issue
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    ANALYSIS OF MOVEMENT OF A DOUBLE NESTED EXTENDED NOZZLE
    Wang Chengxuan;Su Cheng (Huaihai institute of Engineering,Lianyungang 222001)
    1995, 15 (03):  . 
    Abstract ( 1528 )   Save
    This paper analyses development process of a double nested extended nozzle by using the motion theory on center of mass,and a normal differential eguation of second-order is obtained.The axial displacement,velocity and acceleration of extended cones are obtained by solving the equation with Runge-Kutta's method of forth-order.This paper gives a sample of single nested extended nozzle.The computation results are fundamentally consistent with the results of test.The method in this paper can be used in the design of a nested extended nozzle.
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    TIME UNIFYING AND ORBIT ESTIMATION OF MULTI-STATION TRACKING DATA OF CONTINUOUS WAVE RADAR SYSTEM
    Wang Zhengming(National University of Defense Technology,Changsha 410073)
    1995, 15 (03):  . 
    Abstract ( 1759 )   Save
    he continuous wave radar system is the main equipment for high precision orbit observing at present.Effected by various factors,the time at different observation station are not all coincide,which leads to errors in the setimation of orbits.By detailed analysis of the observation principles and the time errors,with the advantages of the polynomial representation of the orbit,we establish a nonlinear regression model to estimate the time errors and the coefficients of the orbit polynomials.Further more,a method for parameter estimation and the errors of the estimations are presented.Theory analysis and practical examples show that our method offers higher precision for the estimation of orbits and time errors.
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    INFLUENCE OF SCANNING-MIRROR MOTION ON CCD IMAGE
    Zhao Yang(Beijing institute of Satellite information Engineering,Beijing 100081)
    1995, 15 (03):  . 
    Abstract ( 1676 )   Save
    in this paper,the simulation model for the mutual influence between the motion of the rotational parts and the satellite attitude vibration is presented by using Lagrange equation,and the satellite attitute vibration is calculated.The influence on the CCD image geometry quality is discussed.
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    PIGGYBACK PAYLOADS EVER FLOWN OF CHINESE RETURNABLE SATELLITES──EXPERIMENTS OF SPACE MATERIAL SCIENCE
    Wang Xiji;Lin Huabao;Su Lianfeng(Chinese Acadmy of Space Technology,Beijing 100081)
    1995, 15 (03):  . 
    Abstract ( 1605 )   Save
    Since 1987,China has used its returnable satellites'surplus capacity to carry out a series of experiments of space science and technology on board, and obtained ideal results.In this papar the experiments results on space material science area are briefly outlined.
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    A NEW TYPE OF HELICAL FILTER
    Yin Xinshe(Xi'an institute of Space Radio Technology, Xi'an 710000)
    1995, 15 (03):  . 
    Abstract ( 2953 )   Save
    A new coupling structure for helical filters has been Presented.It is realized with a single cylindric shield, the belieal resonators are fixed transversely in the cylinder.No iris is necessary for separation between the resonators.The couplings between the resonators depend mainly on the distances and the angles between them. Compared with the general rectangular shield belieal filters,the new type is simpler in structure and easier to adjust. Besides these,the realizable bandwidth of the filter is fairly wide.Some experimental results for the filters are given,one has bandwidth of 27% without special measure employed,and another has two evident attenuation poles on either side of the passband.
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    STATUS AND DEVELOPMENT OF STRAY LIGHT ELIMINATION TECHNOLOGY FOR SPACE-BORNE OPTICAL SENSORS
    Hao Yuncai;Xiao Shuqin;Wang Lixia(Beijing Institute of Space Machine and Electricity, Beijing 100076)
    1995, 15 (03):  . 
    Abstract ( 1874 )   Save
    The current international level in the field of stray light technology,the trend of development of the theory of stray radiation and a discussion on stray light elimination technology both home and abroad are described.The theory of scattering,analysis softwave.testing method and stray light suppression measures.etc.are presented the paper also makes proposals about the technology in reference to the present level and situation at home and future demands by more davanced spaceborne sensors.
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    DESIGN,TEST OF SPACECRAFT HEAT PIPE RADIATOR AND ITS APPLICATION FOR COMMUNICATION AND BROADCASTING SATELLITE
    Hua Chengsheng(Beijing Institute of Spacecraft System Engineering, Beijing 100086)
    1995, 15 (03):  . 
    Abstract ( 1685 )   Save
    This paper describes the method of the thermal analysis and optimization design for spacecraft heat pipe radiator.Two test samples of aluminium honeycomb heat pipe racliaror were built.In one of the samples the heat Pipes are inserted into the honeycomb panel facesheets and in the other the heat pipes are installed on the facesheet.Thermal performance of the two type radiators were evaluated by the tests and the theroretical calculation was proved.The design and solar simulation test of a heat pipe radiator for cooling TWTA of communication and Broadcating satellite are presented.
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    Ku BAND RAIN ATTENUATION ESTIMATION FOR SATELLITE COMMUNICATIONS
    Shi Dingzhou(Shanghai Broadcast Equipment Factory,Shanhai 200050)
    1995, 15 (03):  . 
    Abstract ( 1901 )   Save
    hree mathematic models of estimating rain attenuation of the Ku band are described and the characteristics of this band rain attenuation are discussed.According to these models.the values of the rain attenuation are estimated at a variety of cases and compared with the measured data.Finally,the rain area distribution in China and the margin of the Ku band rain attenuation are discussed.
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    TEST SPECIFICATION FOR PERFORMANCE EVALUATION OF OSR
    Chang Tianhai;Wang Shaohong;Qiu Jiawen(Lanzhou institute of Physics,Lanzhou 730000)
    1995, 15 (03):  . 
    Abstract ( 1604 )   Save
    Thermal-control material OSRs have to meet a variety of ground and space environments during ground storage and space flight of space vehicles.In order to assure the reliability and long lifetime of space vehicles,OSR products must be tested in a variety of ground and space environments and the product performance must be checked and investigated.In this paper the aims and specifications of these tests have been discussed.
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