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25 June 1998, Volume 18 Issue 03 Previous Issue    Next Issue

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CHINA’S CDAS OF METEOROLOGICAL SATELLITE FY2 Tong Kai(Chinese Academy of Space Technology,Beijing 100081) 1998, 18 (03):  .  Abstract ( 1735 )   Save The Command and Data Acquisition Station (CDAS) of the meteorological satellite FY2 is a first Chinese advanced comprehensive station.It integrates remote sensing image receiving and real time processing,broadcasting cloud pictures of different type,data communications,tracking,telemetry and command,trilateration ranging and satellite attitude determination.This paper describes its tasks.constructions and functions.The system block diagram and main specifications of the system and subsystems are given.The overall situation of design and development process are also analysed.  Related Articles | Metrics

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DESIGN OF THE SYNCHRONIZERTIMER OF SYNCHRONIZER/DATA BUFFER SYSTEM Gong Derong(Beijing Institute of Control Engineering,Beijing 100080) 1998, 18 (03):  .  Abstract ( 1722 )   Save SynchronizerTimer is an important instrument of the Synchronizer/Data Buffer (S/DB) system for Command and Data Acquisition Station (CDAS).The device contains a highaccuracy digital phase locked loop that can precisely recover synchronizationbasic information from geostationary meteorological satellite cloud pictures.The Digital phase locked loop includes a phase comparator made up of high speed elements and a filter implemented by computer software.It applies standard frequency count mode and can complete the tracking of analog sun(highprecision sun pulse)and digital sun (scan synchronization digital),and measures the clock frequency on satellite,etc.At the same the microcomputer can server as a system manager. Related Articles | Metrics

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VISIBLE AND INFRA RED SPIN SCANNING RADIOMETER DATA PROCESSING METHOD Fan Shiming Liu Jian Qian Liqun Zhong Fang (Beijing Institute of Satellite Information Engineering,Beijing 100080) 1998, 18 (03):  .  Abstract ( 1553 )   Save The method of VISSR data buffering and processing is the key topic to design and manufacturing VISSR data processing subsystem for CDAS of FY 2 geostationary meteorological satellite.It will affect the accuracy and quality of the stretched Vissr(S.V.).The principle and calculating method of the processing model in which the data are first buffered and then resampled are discussed in this thesis.The technical way that the VISSR data are equal angle resampled using high speed parallel processor consisting of multi DSP is also introduced. Related Articles | Metrics

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THE CDAS AUTOMATIC MONITORING AND CONTROLLING SYSTEM Chen Xiaohua Wang Yanguang Li Jilin Huang Canlin(Beijing Institute of Satellite Information Engineering,Beijing 100080) 1998, 18 (03):  .  Abstract ( 1571 )   Save Command and Data Acquisition Station (CDAS) monitoring and controlling system absorbed the advanced experience at home and abroad.The advanced technology of modern computer management was used synthetically.This paper introdues the system plan,system structure and application software design. Related Articles | Metrics

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A REALTIME TELEMETRY AND ATTITUDE DETERMINATION SYSTEM BASED ON MULTILEVEL FAULT-TOLERANT Sun Baoxiang Li Mingtao Wang Dongsheng Gao Yijun Hua GengxinLiu Chengxi Wang Changlong Jian Ming Wang Yuanxi Bai Zhiying(Beijing Institute of Control Engineering,Beijing 100080) 1998, 18 (03):  .  Abstract ( 1568 )   Save The CDAS realtime telemetry and attitude determination system of meteorological satellite FY2 is a system of multifunction long life time and high reliability ,based on multiprocessor concurrent processing and multilevel faulttolerant architecture.It implements integrally realtime processing of analog telemetry including demodulation of accurate sun pulse,realtime determination of satellite's attitude,coding telemetry demodulation and realtime data processing,satelliteground loop simulation test,and processing of mass data,graphics and characters,communication and recording in realtime,etc. Related Articles | Metrics

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TELEMETRY DECODING SYSTEM DESIGN OF FY2 CDAS Wang Xi(Beijing Institute of Spacecraft System Engineering,Beijing 100086) 1998, 18 (03):  .  Abstract ( 1832 )   Save The telemetry decoding system of FY2 CDAS is used to demodulate coded telemetry signal to get information from Chinese FY2 meteorological satellite.The operators then analyze all these decoded data in order to know the working status of the satellite in detail.These decoded data are also transmitted to the SOCC.A redundant design,including active part and backup,enhances the reliability of the system.In case of the active equipment is out of order,the running of backup can be automatically switched.In this paper,the designing methods for a reliable telemetry decoding system are given,including subcarrier demodulation,frame synchronization,IRIGB time decoding,real time data analysis on computer etc. Related Articles | Metrics

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DESIGN OF RANGING SYSTEM IN CDAS Zhang Tingxin(Xi'an Institute of Space Radio Technology,Xi'an 710000) 1998, 18 (03):  .  Abstract ( 1552 )   Save In order to accomplish the trigonomotric ranging of FY2 meteorological satellite,the ranging instrument has been developed.This paper introduces the functions and application of the ranging instrument,describes the principle of ranging with multi sidetone and measurement procedure,and also gives the characteristic and composition of the system.A pure sidetone ranging system was designed,and the specification and performance of this system was discussed. Related Articles | Metrics

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SYNCHRONIZATION TECHNIQUE FOR CLOUD IMAGE DATA Yan Jiazhen(Xi'an Institute of Space Radio Technology,Xi'an 710000) 1998, 18 (03):  .  Abstract ( 1648 )   Save The frame period of satellite image changes suddenly,A positioning aperture technique is implemented to reliably acquire the frame period.With the help of subframe protection technique,the actual system works continuously,stably and reliably. Related Articles | Metrics

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METEOROLOGICAL SATELLITE CDAS RAW IMAGE DEMODULATOR Xu Xing(Xi'an Institute of Space Radio Technology,Xi'an 710000) 1998, 18 (03):  .  Abstract ( 2002 )   Save This paper presents a new methodfourth law loop switching method,which is based upon the traditional fourth law loop and is suitable for fast acquisition.According to this principle,we develop a FY2 meteorological satellite CDAS raw image demodulator which has the properties of easy designing and adjusting,fast acpuisition,wide capture range and good bit error rate performance.Both testing and actual use prove that this demodulator achieves good specifications and can fully satisfy the actual demands. Related Articles | Metrics

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INTERMEDIATE FREQUENCY TRACKING AND TELEMETRY RECEIVER OF CDAS Xi Qingling Li Genbao(Xi'an Institute of Space Radio Technology,Xi'an 710000) 1998, 18 (03):  .  Abstract ( 1723 )   Save This paper introduced designing principles and realizing methods of tracking and telemetry receiver of CDAS of FY2 satellite.The receiver has short pullin time,large dynamic range,wide tracking range and small zero drift.By using switching control,the receiver can automatically follow the Japanese GMS satellite.Test results of the receiver are satisfied and superior to the specification. Related Articles | Metrics

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A TURNAROUND STATION IN TRILATERATION RANGING SYSTEM Lan Maotian(Xi'an Institute of Space Radio Technology,Xi'an 710000) 1998, 18 (03):  .  Abstract ( 1520 )   Save The Ulumqi and Guangzhou turnaround ranging stations developed by the company of the author and the Beijing master station compose a threepoint ranging system.This system can perform the function of the ranging and orbit determination of FY2 satellite.This article mainly introduces the configuration,function and technical specification of the turnaround ranging stations.Compared to the same type of the products abroad,this type of station has some distinguished features and has passed the design review of all levels. The stations were used in the tracking of the Japanese Meteorological satellite.The design of the turn around ranging station has been proved to be feasible and reasonable by the successful ranging and orbit determination of the FY2 satellite. Related Articles | Metrics

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METHOD OF CORRECTING DOWN LINE FREQUENCY SHIFT AND CALCULATING POINT FREQUENCY Jiang Zhensheng(Beijing Institute of Satellite Information Engineering,Beijing 100080) 1998, 18 (03):  .  Abstract ( 1578 )   Save During FY2 satellite operating in orbit ,the local oscillator will have some frequency shift.It limits the frequency capture range of Data Collection Platform Receiving system(DCPR) corresponding to phase-locked loop of Data Collection Platform (DCP) information. In some serious eases the meteorological data collected by DCP can't be demodulated,so the system can't run normally. In order to resolve the above-mentioned problem, in this paper the method of down line frequency shift and calculating point frequency is discussed.The result of testing FY2 in orbit is satisfactory and shows that even if random interference is much serious, the succes probability of DCPR reception and modulation is over 98%. Related Articles | Metrics

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THE DESIGN OF CDAS 20m ANTENNA SUBSYSTEM Song Linhui(The North West China Research Institute of Electronic Equipment,Xi'an 710065) 1998, 18 (03):  .  Abstract ( 1798 )   Save This paper introduces the configuration,characteristics and system design of the antenna subsystem,which meets relevant requirements of the Command and Data Acquisition Station (CADS) of FY2 China′s first geostationary meteorological satellite.CDAS antenna subsystem mainly consist of antenna mechanical Structure,feed network,antenna control unit (ACU) and monitoredcontrol (MAC).This antenna is a 20m modified cassegrain antenna,its feed is a corrugated horn,and adopts multiplemoulding autotrack monopulse method.The servo position loop consists of the angle encoder.Antenna is driven by 3phase SCR and servoDC motor.The backlash is eliminated by using dualmotor.ACU has multipleoperation modes and is easy controlled.ACU monitors working parameters and status of system,and detects the errors online. Related Articles | Metrics