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Research of Satellite Time Service Device with GPS System

Author: WangXinJun
Tutor: CaoYuQiang；ZhengMingGang
School: Shandong University
Course: Instrumentation Engineering
Keywords: GPS B code Timing technology Error correction SCM
CLC: P228.4
Type: Master's thesis
Year: 2008
Downloads: 638
Quote: 4
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Abstract


Aspects of modern life are inseparable timing technology, granted when a variety of ways, satellite time for its all-weather, global coverage, high accuracy and reliability, has been widely used in easy-to-use features. GPS is fully completed by the United States in 1993, the second generation of satellite navigation systems, its technology is mature, the most widely used. The system in real time to provide users with highly synchronized with international Standard Time UTC time, has been widely used in electricity, telecommunications, aerospace and other fields, as the system time basis. The article describes the time synchronization method based on GPS time synchronization system, improve synchronization time synchronization pulse accuracy and stability of the entire synchronous system design. Article through the analysis of the GPS clock availability and system error calibration method proposed several errors in order to improve the crystal clock frequency measurement accuracy of anti-jamming system measures and after the failure of the GPS signal solutions to maintain the normal operation of synchronous clock. B code is a time code IRIG-B referred to, is an important time synchronous transmission mode, its the actual superiority Be time system equipment preferred standard pattern. B code decoding circuit, IRIG-B code standard system equipment sent out decoding, minutes, seconds, and add milliseconds information sent to the host computer to the system time of the calibration of the machine. This article from two aspects of hardware and software design, described in detail the implementation of the system. Hardware choice, the PIC family of microcontrollers anti-interference ability, high cost performance advantages, was selected as the main controller is applied to the central processing unit. GPS time synchronization device main stars preprocessing unit of the GPS information, the B code decoding unit, punctuality of the synchronizing signal circuit, the sync pulse signal selecting means, time information and communication interface and the B code encoding circuit and the like. Where GPS information preprocessing unit extraction the sync pulse PPS time information; B code decoding unit used to read the other time synchronization device transmitted the B code information and extract synchronization pulse the PPS; the sync signal punctuality circuit for the device has its own internal synchronization signal, and when the external time information input, the circuit itself pulse correction; synchronizing pulse signal selection unit used to control the output of the synchronization pulses; the time information of the communication interface, B code encoding circuit for synchronizing time information output encoding. On the software side, we introduced the GPS pre-processing unit, the punctual time synchronization pulse unit and sync pulse signal selection unit software design ideas. The device has been tested with high precision, easy to operate, flexible expansion, has the bulk market. The paper concluded that the synchronous timing device shortcomings: First, the accuracy to be further improved, and undue reliance on the GPS system, you should consider the compatibility issues with other satellite timing system (in particular, China's Beidou satellite navigation system).

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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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