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25 August 1996, Volume 16 Issue 04 Previous Issue    Next Issue

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PERFORMANCE OF ESCAPING POWER UNIT OF EMERGENCY LIFESAVING SYSTEM Chen Jianxiang(Beijing institute of System Engineering,Beijing 100101)Ren Xuan(National University of Defence Technology,Changsha 410073) 1996, 16 (04):  .  Abstract ( 1750 )   Save Emergency lifesaving system(ELS) is a major component of rocket-spaceship system in manned spaceflight.By taking the ELS of " Co" for example,it's composition and process program are introduced in this paper, the relationship between the performance data of escaping power unit (main engine and control engine) and the escaping trajectory is also approached in detail by means of numerical simulation.Some good result are obtained in this paper. Related Articles | Metrics

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EFFECT OF FRICTION AND PRESSURE ON DEPLOYMENT CHARACTERISTICS OF A DOUBLE NESTED EXTENDED NOZZLE Wang Chengxuan; Liu Weifang;Su Cheng;Zhou Jinshu(Huaihai Institute of Engineering, Lianyungang 222005) 1996, 16 (04):  .  Abstract ( 1799 )   Save This paper analyses deployment chsracteristics of a double nested extended nozzle under the influence of friction of a actuator, sealing friction of extended cone, atmospheric pressure and pressure of combustible gas. The methods presented in this paper have a guide action on design of the extended nozzle and estimation of the deployment time. Related Articles | Metrics

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EVALUATION OF GROUND SPECTRUM CHARACTERISTICS AND STAR MAGNITUDE OF SPACIAL OBJECT Shen Feng;Jiang Wenhan (Institute of Optics and Electronics,CAS,Chengdu 610209) 1996, 16 (04):  .  Abstract ( 1882 )   Save In this paper researched the ground spectrum characteristics and star magnitude of spacial non-self-illumination object which is probed by Adaptive Optics System (AOS). The non-self-illumination object reflects sunlight into wavefront sensor system of AOS through atomsphere. The photon speed entering AOS's subaperture is also evaluated. In the contrast, compared the differences between sunlight-reflecting object and laser-illuminated object. Related Articles | Metrics

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MANEUVER ERRORS CORRECTION DURING HORIZONTAL IMPULSE MULTI-SEGMENTAL ARC RENDEZVOUS Wu Meiping;Wu Ruilin (National University of Defence Technology,Changsha 410073) 1996, 16 (04):  .  Abstract ( 1683 )   Save This paper researches correcting the maneuver errors of two spacecraft rendezvous by using two-impulse. Derive the ideal impulse solution of correcting errors,and simulate it in the reference equations of relative motion.The conclusion illustrates that this method is feasible. Related Articles | Metrics

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RELIABILITY STUDY OF LONG-LIFE COMMUNICATION SATELLITES Shao Ruizhi (Beijing Institute of Spacecraft System Engineering,Beijing 100086)Fan Benyao(Chinese Acadmy of Space Technology, Beijing 100081) 1996, 16 (04):  .  Abstract ( 1947 )   Save Study of communication satellite(CS)s reliability not only could help to solve its engineering problems but also would play an important role for long-life spacecraft engineering.On the basis of wide researching the information on communication satellites home and abroad,the works on surveying their performances on orbit and analysing the elements which influence their life and reliability have been done.Space environment is the important one in these elements. The study of methods for reducing or avoiding its effects,that is "spacecraft immunity engineering for environment",has also been done.Other design strategies for long-life spacecraft have been studied. The design experience has been synthesized and the subjects which need further study have been searched. Related Articles | Metrics

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RELIABILITY MEASURES INVESTIGATION OF THERMAL CONTROL SYSTEM FOR SATELLITES Hua Chengsheng(Beijing Institute of Spacecraft System Engineering,Beijing 100086) 1996, 16 (04):  .  Abstract ( 1683 )   Save in order to increase the reliability of thermal control system for satellites, especially for long-life satellites, the reliability measures which should be adopted in the thermal control design are discussed in dealing with the relationship between thermal subsystem and satellite system and the effect of space environment on the satellite. The degradation of the thermal control coatings for long-life satellite is presented in detail. The suggestions are put forward about the reliability research of thermal control system in the future. Related Articles | Metrics

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EFFECTS OF THERMAL TEMPERING ON STRENGTH OF WINDOW GLASS OF MANNED SPACECRAFT Song Lixin; Hu Xingfang(Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050)Wu Guoting(Beijing Institute of Spacecraft Systems Engineering,Beijing 100086) 1996, 16 (04):  .  Abstract ( 2078 )   Save Based on the distribution of the residual stress in the window glass of manned spacecraft, the calculation model of stress intensity factor for thermal tempered glasses is formulated and reinforce performances are analyzed. By using the model, the effects of tempering degree and glass thickness, as well as the crack growths are discussed. It is pointed out that, at the same tempering degree, the fracture strength increases with the increasing of the thickness of tempered glass, but does not for untempered glass. The discussion of the stress intensity factor for tempered glass shows that it is unreasonable to take KIc+Kr as the critical stress intensity factor for tempered glass. Related Articles | Metrics

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CALCULATION OF VSAT SATELLITE COMMUNICATIONS LINK BUDGETS Chen Daoming(Chinese Academy of Space Technology, Beijing 100081) 1996, 16 (04):  .  Abstract ( 1913 )   Save There are a series of remarkable features in VSAT satellite communications.It could be served to end users directly.An engineeing calculation for link budgets is discribed. Some methods for selecting various link parameters are discussed also.A calculaton of a Ku band satellite communication link budgets as an example is presented in the last part of this paper. Related Articles | Metrics

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ESTABLISHMENT AND MEASUREMENT OF GPS CRUSTAL DEFORMATION MONITORING NETWORK IN REGION OF CAPICAL CIRCLE Li Yanxing(First Crustal Deformation Monitoring Center,State Seismological Bureau,Tianjin 300180) 1996, 16 (04):  .  Abstract ( 1583 )   Save in the paper,the scientific thinking and principles for establishing the GPS crustal deformation monitoring network in the region of the Capital Circle and the basic conditions of the network and the major technical measures adopted to improve the observation accuracy are described systematically.This network is a GPS monitoring network with the largest scale and highest accuracy in China. The establishment and measurement of the network have already been accomplished at present,and the expected accuracy will be better than 5×10-8.This network can play an important role in earthquake monitoring and predicting. Related Articles | Metrics

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A NEW METHOD ABOUT SPEED CORRECTION IN MEASURING EXTERNAL TRAJECTORY──RADIOMETER METHOD Zhang Yu(China Research institute of Radiowave Propagation,Xinxiang 453003) 1996, 16 (04):  .  Abstract ( 1566 )   Save This paper introduced a new method about the speed correction with higher precision in measuring external trajectory──radiometer method.The error of missile speed was deduced by the distance error. The distance error was obtained by a microwave radiometer directly detecting the atmospheric radiation brightness temperature on the path of radio wave propagation. The standard deviation of the distance error obtained by using radiometer detecting method is lower by one-third to two-thirds than that obtained by using the normal method.Therefore, the precision of the distance variation rate is higher and can make real time correction on azimuth and elevation by using this method. Related Articles | Metrics