원문정보
초록
영어
The rapid development of various kinds of aerospace application systems requires the appropriate high-accuracy time and frequency standard. In order to establish suitable time and frequency standard in aerospace, based on the establishment of aerospace satellite visual model, we simulate the satellite visual time of 3-layer satellite constellation, including GEO satellite(Geostationary Earth Orbit), IGSO (Inclined GeoSynchronous Orbit)satellites and MEO(Medium Earth Orbit) satellites. The visual features of this satellite constellation have been gained. Combining with the major influencing factors of satellite clock offset error, we study the layered aerospace time synchronization architecture and give the advantage of the architecture and the choice of time synchronization method. Starting from the establishment of the time synchronization link demand, we simulate the variation range of intersatellite distance of the layered aerospace time synchronization architecture, and give budget results of GEO-GEO link in laser band and GEO-IGSO and GEO-MEO links in S-band and Ku-band. The results show that GEO-GEO link can achieve to more than 3Gb/s data transmission rate on condition that the transmitting power is 0.5W, the antenna diameter is only 20cm; if the S-band transmission rate is in excess of 2Mb/s, when the antenna is 1m in diameter, the transmitting power needed is about 50W. In the Ka-band, 1m antennas only need 1W transmitting power to provide an intersatellite data transmission rate higher than 2Mb/s. Research results serves as reference for the establishment of layered aerospace time synchronization architecture and improvement of time synchronization precision.
목차
1. Introduction
2. Component and Visual Simulation of Satellite Constellation
2.1. Component of Satellite Constellation
2.2. Satellite Mutual Visual Model
2.3. Visual Time Simulation of Satellite Constellation
3. Design of Aerospace Time Synchronization System Based on Layered Architecture
3.1. The Major Influencing Factors of Satellite Clock Offset Error
3.2. Design of Layered Aerospace Time Synchronization System
3.3. The Advantage of Layered Aerospace Time Synchronization system and the choice of Time Synchronization methods
4. Simulation of the Variation Range of Intersatellite Distance of the Layered Aerospace Time Synchronization Architecture
4.1. Major Parameters of Intersatellite Link budget
4.2. Simulation of the Variation Range of Intersatellite Distance of the Architecture
5. Intersatellite Link Budget Method
5.1. Intersatellite Laser Link Budget Method
5.2. Intersatellite Microwave Link Budget Method
6. Intersatellite Link Budget Results of the Laered Aerospace Time Synchronization Architecture
6.1. GEO-GEO Laser Link Budget Results
6.2. GEO-MEO and GEO- IGSO Microwave Links Budget Results
7. Conclusions
Acknowledgements
References