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2021-06-18T13:46:23+09:00
2021-06-18T13:46:23+09:00
2021-06-18T13:46:23+09:00
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Ritsumeikan Univ.KO-603
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14.25 0 0 14.25 40.7013 788.25 Tm
(POSITIONING ALGORITHMS AND IONOSPHERE TEC ESTIMATION BASED)Tj
10.126 -1.211 Td
(ON GNSS REGRESSION MODELS)Tj
/TT1 1 Tf
12 0 0 12 483.666 742.5 Tm
(SEIGO FUJITA)Tj
-36.597 -2.313 Td
(The present thesis proposes positioning algorithms and ionosphere Total \
Electron Content \(TEC\))Tj
-1 -1.5 Td
(estimation based on Global Navigation Satellite System \(GNSS\) regressi\
on models. )Tj
0 -1.5 TD
(First, mathematical models of the pseudorange and carrier phase measurem\
ents, which are basic equations for)Tj
T*
(positioning, are derived. Here, fundamental measurements of L1 and L2 ca\
rrier phases and pseudoranges)Tj
T*
(based on C/A and P\(Y\) codes are formulated using novel GNSS regression\
models. In addition, GNSS)Tj
T*
(regression models for known and unknown positions are derived. )Tj
T*
(Second, a new approach to obtaining a carrier-phase-based precise point \
positioning \(PPP\) algorithm without)Tj
T*
(linear combinations of the pseudorange or carrier phase measurements is \
introduced. Furthermore, in order to)Tj
T*
(achieve rapid and accurate positioning, the derived PPP algorithm is ext\
ended to Very Precise Point)Tj
T*
(Positioning \(VPPP\) using multiple antennas with common clock errors an\
d the known distances among)Tj
T*
(receivers. Then, based on recursive Kalman filtering, algorithms for the\
estimation of the mid-position of the)Tj
T*
(antennas with the constraints of the distances among antennas were devel\
oped. The experimental results of)Tj
T*
(the present PPP and VPPP algorithms using real receiver data collected i\
n static environments are shown. )Tj
T*
(Finally, using the GNSS regression models for GNSS observables in the ca\
se of known positions \(in the)Tj
T*
(reference stations\), a method by which to estimate the ionosphere TEC, \
as well as the phase ambiguities)Tj
T*
(contained in L1 and L2 band carrier-phase data at the reference stations\
, is derived. The accuracy of the)Tj
T*
(estimated Vertical Total Electron Content \(VTEC\) is also examined by c\
omparing it with the Klobuchar)Tj
T*
(model and with Global Ionosphere Maps \(GIM\) provided by the Internatio\
nal GNSS Service \(IGS\).)Tj
ET
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