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A Study of Time Synchronization for Maritime Aerospace TT&C Systems

Author: WuXueLiang
Tutor: WenAiJun;ZhaoBingWen
School: Xi'an University of Electronic Science and Technology
Course: Electronics and Communication Engineering
Keywords: TWSTT TDMA time-delay measurement encoding and demodulation of IRIG-B FPGA
CLC: P228.4
Type: Master's thesis
Year: 2008
Downloads: 25
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Abstract


Time transfer methods are becoming increasingly important in the world of high-speed communication, global navigation and precision metrology. There are two primary methods of time dissemination around the world: two-way satellite time transfer （TWSTT） and common-view Global Position SystemGPS time transfer. There is a catch: GPS is a United States Department of Defense system, its applications are limited. TWSTT is often used as a secondary measurement to GPS or a sole means time recovery with performance that is superior to GPS time transfer, so it has been a hot topic in time community all the time.In this thesis,the implementation of Time Synchronization project based on TWSTT is mainly studied, which is designed for maritime aerospace TT&C systems between the master earth station and the ship-borne station. Firstly, the paper introduces the fundamental principle of TWSTT, error analysis and the data processing. Taking full advantage of the current related equipments of the master earth station and the ship-borne station, we select the project based on TWSTT using TDMA technology after two feasible programs are analysed and compared. Laterly,the paper shows us a new project of time synchronization equipments for the master earth station and the ship-borne station, and detailed analysis the technology principle. The time-delay measurement methods based on high frequency pulse interpolation is implemented in FPGA device. The encoding and demodulation of the IRIG-B（DC） are both implemented in FPGA device using VHDL. Finally, describes the hardware implementation and related FPGA modules of the time signal receiving and recovering unit, error computing unit,time signal generating and sending unit and displaying and controlling unit.

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CLC: > Astronomy,Earth Sciences > Surveying and Mapping > Geodesy > Satellite geodesy and space geodesy > Global Positioning System (GPS)
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