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25 February 1992, Volume 12 Issue 01 Previous Issue    Next Issue

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PROCESSING METHOD USED FOR REMOTE SENSING DATA OF SEA SURFACE TEMPERATURE BY METEOROLOGICAL SATELLITE Qiu Kangmu Wang Baohua Wu Xiao (Satellite Meteorological Center,SMA) 1992, 12 (01):  .  Abstract ( 1956 )   Save For the remote sensing of Sea Surface Temperature(SST)by the meteorological satellite,the keys of data processing are cloud testing and correction of atmospheric attenuation.The current method used in the SST processing system of Chinese Satellite Meteorology Center is the multi-cha- nnel statistical regressive method which has been generally used in the world for NOAA satellite data.But as the radiometer on the Chinese FY-1 sate- llite has only one infrared window channel,Satellite Meteorology Center has to develop a statistical estimation method.This paper briefly introduces the fundamental principles,computation methods and processing results by using these methods and reviews the characteristics of the two methods. Related Articles | Metrics

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DEPLOY DYNAMICS PROBLEMS OF LARGE DEPLOYABLE ANTENNA FOR SATELLITE Qiu Yang Liu Mingzhi (XIDIAN University) 1992, 12 (01):  .  Abstract ( 1777 )   Save Considering the characteristics of deployable antenna,such as large size,low rigidity,complex deploy machanisms and adverse environ- ment,this paper,combined with the structural characteristics of antenna, summarizes the deploy dynamics problems of large deployable antenna for satellite,and puts forward some methods and ways used to solve these problems. Related Articles | Metrics

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DEORBIT AND RE-ENTRY USING TETHER Zhu Renzhang (Beijing Institute of Spacecraft Systems Engineering) 1992, 12 (01):  .  Abstract ( 1443 )   Save A two stage exponential procedure of deployment and the maximum possible ratio of deployment rate to length can stimulate tether to produce a greater magnitude of negative rate of pitch angle.The angular rate can reduce the length of tether used for re-entry or improve re-entry characteristics. Related Articles | Metrics

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NONPARAMETER RADIOMETRIC CORRECTION FOR REMOTE SENSING IMAGES Wang Yanguang Pang Yajun (Beijing Institute of Satellite Information Engineering) 1992, 12 (01):  .  Abstract ( 1563 )   Save A nonparameter radiometric correction method used for the remote sensing image processing is presented in this paper.Experiment shows that image processed by this method is in good radiometric quality.This method can also be used for distripping. Related Articles | Metrics

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A THEORETICAL STUDY ON DIELECTRIC LOADED PYRAMID HORN Yang Jisong (Xi'an Institute of Space Radio Technology) 1992, 12 (01):  .  Abstract ( 1721 )   Save A model of wedge(or V-shaped)dielectric loaded horn is introduced in this paper.Theoretical analysis and experiment about it are given and show that the loaded dielectric do have the ability to widen the mainlobe of general pyramid horn's E directional pattern and lower its sidelobe level.The sidelobe level may be lower than 25dB.A simple and ef- ficint pyramidal horn feeder is available. Related Articles | Metrics

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STUDY OF RESERVOIR INDUCED EARTHQUAKES USING THE IMAGES OF CHINESES LAND RESOURCE SATELLITE Wu Shumin (Institute of Crustal Dynamics,State Seismological Bureau) 1992, 12 (01):  .  Abstract ( 1886 )   Save Using the images of Chineses Land Resource Satellite laune- ched in October 1985,together with data of earthquakes and earth-stress measurement,we'd studied the structural features of PAN JIAKOU reser- voir and its neighbouring areas,HEBEI Province.“The theory of density equilibrium ellipsoid”was also used to probe into the problem of induced seismicity in reseroir.The results of this study indicated that there might be earthquake less than 5 degree on Richter scale.Responsible Depatment must pay attention to it. Related Articles | Metrics

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EVALUATION METHOD OF OPTICAL-ELECTRIC PERFORMANCE OF CONDUCTIVE FILMS FOR SATELLITE Lu Yusun Li Hua Cai Chun (Lanzhou Institute of Physics) 1992, 12 (01):  .  Abstract ( 1510 )   Save The modification of the high insulation materials of satellite is a very effective method for controlling charging on it.The modification of several flexible and rigid materials has been provided by means of physi- cal vapor deposition(PVD)technique.However,in order to obtain the high reliability and long life time of satellite operation,it is necessary to test and evaluate every performance of prepared films,which contains optical- electrical and stable performance of films under various conditions.The object and request about the above series of test are discussed in this article. Related Articles | Metrics

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INFLUENCE OF SIMULATED SPACE ENVIRONMENT ON PERFORMANCE OF OPTICAL SOLAR REFLECTOR Hu Bingsen Qiu Jiawen Wang Bin Chang Tianhai (Lanzhou Institute of Physics) 1992, 12 (01):  .  Abstract ( 2372 )   Save The influence of simulated space environment on the properties of the satellite temperature-control coating-Optical Solar Reflector(OSR)is discussed.Two kinds of OSR sample are tested in the simulated space environ- ment.The simulated items include vaccum UV irradiation,low energy eletctron and two energy levels protons irradiation.The surface charge/discharge test is carried out under plasma environmental conditions.After the electron,proton and UV accelerative irradiation of total dosage equivalent to 7-year at the south or north pole of geosynchronous orbit satellite,the solar absorptance increases from 0.068 to 0.078 and the normal em ttance decreases from 0.83 to 0.72 for conductive OSR,while the absorptance increases from 0.066 to 0.085 and the nornal emittance decreases from 0.82 to 0.76 for nonconduc- tive OSR.Also,it is shown from the charge/discharge test that the surface charge potential is only 15～40 V for conductive OSR,but 1 to 10 kV for nonconductive OSR.Therefore the conductive OSR can control the surface charge/discharge effectively. Related Articles | Metrics

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A SIXTH ORDER TRIDIAGONAL DIFFERENCE METHOD FOR NONLINEAR TWO-POINT BOUNDARY VALUE PROBLEM Zhou Baomin (Beijing Institute of Satellite Information Engineering) 1992, 12 (01):  .  Abstract ( 1549 )   Save This paper presents a new sixth order finite difference method to solve the second order nonlinear differential equation y″=f(x,y),subject to the boundary conditions y(a)=A,y(b)=B.The sixth order convergence of this method has been proved by theoretical deduction and actual calcu- lation. Related Articles | Metrics

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PHASE-LOCKED LOOP IN SPACE REMOTE-SENSOR Zhu Min (Beijing Institute of Machine and Electricity) 1992, 12 (01):  .  Abstract ( 1483 )   Save Resolutiaon is one of the most important factors to estimate the performance of a remote sensor.Because a remote sensor gets image during the process of satellite travelling,and this,no doubt,will introduce an image distortion,we must make an accurate image motion compensation to get a higher ground imaging resolution.A phase-locked loop with the chara- cteristics of rapid response,low power consumption,antijamming and accuracy of 0.1% is designed in this paper.It can meet the requirement of 5-meter ground resolution. Related Articles | Metrics

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VSAT SATELLITE DATA COLLECTION SYSTEM AND ITS APPLICATION FOR WATER CONSERVANCY PROJECT Yan Chengyuan (Yantai Institute of Telemetry Technology) 1992, 12 (01):  .  Abstract ( 1801 )   Save VSAT communication system developed in early 1980's is a flexible and convenient communication system.This paper presents the composition and major technical characteristics of a VSAT satellite data collection system and the method for the computation of satellite link parameters.The application of this system in a domestic automatic water conservancy project for the first time is also described. Related Articles | Metrics