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008 140618s2012 th ad ||| |000 0 eng d
035 _a.b12133152
099 9 _aAIT Thesis no.RS-12-16
100 1 _aWickramasinghe, Chathura Hasanka
245 1 0 _aImproving real-time PPP positioning by combining QZSS-LEX message and IGS ultra-rapid products
260 _aPathum Thani :
_bAsian Institute of Technology,
_c2012
300 _a65 leaves :
_bill., charts +
_e1 online resource
490 1 _aThesis ;
_vno. RS-12-16
500 _aA thesis submitted in partial fulfillment of the requirement for the degree of Master of Science
502 _aThesis (M.Sc.) - Asian Institute of Technology, 2012
520 _aGlobal Positioning System (GPS) has become a day to day tool with multiple applications. Errors associated with GPS observations makeit impossible to use a single receiver for geodetic, geodynamic and vehicle automation applications requiring centimeter or millimeter level accuracy. Real Time Precise Point Positioning (RT PPP) has become a powerful tool that can provide positioning accuracy comparable to the network solution(Ge et al. 2007)without the need of GPS base station network. International GNSS service (IGS) has been providing data necessary for PPP via internet in real time. Quasi-Zenith Satellite System (QZSS) is a Japanese GPS augmentation system that provides real time PPP correction through an experimental signal (LEX) from June 2011. LEX signal provides real time GPS satellite ephemeris and clock correction. The accuracy of these corrections will directly affect the positioning accuracy(Zumberge et al. 1997). This paper compared the LEX PPP data with the IGS Ultra rapid data products to analyze the accuracy of LEX data. The analysis showed LEX data has systematic errors that can be corrected. A new algorithm was developed to correct clock error and ephemeris errors using a liner model and wavelet transformation. This method improved LEX ephemeris accuracy to decimeter level and the clock correction accuracy to 0.01 microseconds. As a result LEX based real time positioning accuracy was improved by 37%.
650 0 _aGlobal Positioning System
650 0 _aGeographical positions
700 0 _aLal Samarakoon,
_eChairperson
700 0 _aTaravudh Tipdecho,
_eExamination committee
700 0 _aManukid Parnichkun,
_eExamination Committee
710 2 _aGeoinformatics Center, Asian Institute of Technology,
_eScholarship donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. RS-12-16
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B03879
907 _a.b12133152
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_tAbstract--AIT Thesis no.RS-12-16
_vn
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