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Evaluation and analysis of GPS, EGNOS and UTC timescale connections
2009 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Apart from augmenting existing satellite navigation services, the goal of European Geostationary Navigation Overlay System (EGNOS) is to provide the EGNOS user with a source of accurate time and its reference to UTC. The objective of this project was to develop a method of evaluating the difference between EGNOS Network time (ENT) and independent estimation of ENT at user level in locations where EGNOS corrections are valid. For this user an estimate of the difference between its receiver time and ENTuser can be produced, using GPS measurements and EGNOS corrections. If the receiver is connected to an UTC(k), an estimation of UTC(k)-ENTuser is obtained. From the other side, based only on GPS measurements, estimation of UTC(k)-GPST may be obtained. Thus having UTC(OP)-GPST, UTC(k)-GPST and the broadcast offset ENT-UTC(OP), which is given in EGNOS Message Type 12, an estimation of ENT-UTC(k) is obtained. Combined with the previously obtained UTC(k)- ENTuser the estimation of ENT-ENTuser offset can be made. The results of this estimation are given for two stations, which participate to the International GNSS Service (IGS): one in Paris region (OPMT), another one in Torino, Italy (IENG), and are checked with the results of previous observations at OPMT, done by the Centre National d’Etudes Spatiales (CNES), using another method. The advantages and the factors, which decrease performance of this method, are described. Also other applications of combination of different offsets are possible.

Place, publisher, year, edition, pages
2009.
Keyword [en]
Technology, Space, navigation, satellites, performance, time function, time, GPS, GLONASS, EGNOS, EGNOS Network Time, ENT, GPST, UTC, UTC(OP), UTC(IT), UTC(k), OPMT, IENG, IGS, EGNOS, Performance Observatory, EPO, CNES, positioning, velocity, time, geostationary, user level, ENTuser, RIMS, clocks, offsets, accuracy, synchronization, leap seconds, broadcast, messages, MT12, message type 12, CGGTTS, hydrogen maser, caesium, atomic clocks, PRN, MJD, standard deviation, observation
Keyword [sv]
Teknik
Identifiers
URN: urn:nbn:se:ltu:diva-55895ISRN: LTU-PB-EX--09/104--SELocal ID: cb331cc3-f3c2-437e-8ea4-09273552e67dOAI: oai:DiVA.org:ltu-55895DiVA: diva2:1029279
Subject / course
Student thesis, at least 30 credits
Educational program
Space Engineering, master's level
Examiners
Note
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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  • Other locale
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Output format
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