Access restricted to students and staff of home institution
doctoral thesis
A MODEL OF NON-SPECIFIC DAILY PATTERN OF THE SATELLITE POSITIONING SIGNAL IONOSPHERIC DELAY

David Brčić (2015)
Sveučilište u Rijeci
Pomorski fakultet u Rijeci
Metadata
TitleModel nespecifičnoga dnevnog hoda ionosferskog kašnjenja signala za satelitsko određivanje položaja
AuthorDavid Brčić
Mentor(s)Serđo Kos
Renato Filjar
Abstract
U ukupnom proračunu pogreške određivanja položaja jednofrekvencijskim GNSS prijamnicima, ionosfersko kašnjenje satelitskog signala predstavlja najznačajniju utjecajnu veličinu. GPS modelom ispravke ionosferskog kašnjenja (prema Klobucharu), dnevna dinamika ionosferskog kašnjenja opisuje se na globalnoj razini. U doktorskom radu predložen je regionalni model utemeljen na uočenim nespecifičnim pravilnostima u dnevnom hodu ionosferskog kašnjenja signala za određivanje položaja. Nespecifične pravilnosti pojavljuju se pod određenim uvjetima; tijekom mirnog svemirskog vremena, nepobuđene ionosfere, u razdobljima ljetnih mjeseci te na području srednjih geografskih širina. Identificirana lokalna dinamika ionosferskog kašnjenja razlog je i motivacija za provedeno istraživanje, s ciljem unaprjeđenja pružanih usluga i općenito rada GNSS sustava. Model je izrađen na temelju izmjerenih vrijednosti ionosferskog kašnjenja, koje su izvedene iz opažanja kodnih i faznih pseudoudaljenosti. Pri tome su korišteni podaci s referentnih IGS stanica unutar Jadranske regije. Model je verificiran u razdobljima unutar kojih prevladavaju definirani uvjeti okoliša širenja signala za satelitsko određivanje položaja. Dobivene vrijednosti uspoređene su sa stvarnim vrijednostima ionosferskog kašnjenja, te s vrijednostima ionosferskog kašnjenja modeliranim prema Klobucharovom modelu ispravke. Model je ispitan na trima različitim lokacijama u području Jadranske regije u 2006. i 2007. godini. Rezultati su pokazali kako, u odnosu na Klobucharov model, predloženi model u zadanim uvjetima pruža točnije ispravke ionosferskog kašnjenja. Time je potvrđena primjenjivost predloženog modela za područje Jadranske regije i okolice. Značajke modela razmotrene su sa stajališta uspješnosti, prednosti i ograničenja modela. Prikazane su znanstvena i praktična mogućnost primjene modela i ostalih rezultata istraživanja. Analiza pogrešaka modela i njihovih uzroka postavlja smjernice za daljnja istraživanja lokalnih i globalnih uvjeta ionosferske dinamike te Sunčeve i geomagnetske aktivnosti.
KeywordsGlobal positioning system global navigation satellite system satellite positioning signal ionospheric delay total electron content ionospheric delay correction model middle geographic latitudes Adriatic region
Parallel title (English)A MODEL OF NON-SPECIFIC DAILY PATTERN OF THE SATELLITE POSITIONING SIGNAL IONOSPHERIC DELAY
Committee MembersRobert Mohović (committee chairperson)
Serđo Kos (committee member)
Renato Filjar (committee member)
Zoran Mrak (committee member)
Irena Jurdana (committee member)
GranterSveučilište u Rijeci
Pomorski fakultet u Rijeci
PlaceRijeka
StateCroatia
Scientific field, discipline, subdisciplineTECHNICAL SCIENCES
Traffic and Transport Technology
Maritime and River Traffic
UDK55
NATURAL SCIENCES
Geology. Meteorology. Hydrology
654
APPLIED SCIENCES. MEDICINE. TECHNOLOGY
Telecommunication and telecontrol
656.6
APPLIED SCIENCES. MEDICINE. TECHNOLOGY
Transport by water
Study programme typeuniversity
Study levelpostgraduate
Study programmePostgraduate (doctoral) university study programme - Maritime Studies
Academic title abbreviationdr. sc.
Genredoctoral thesis
Language Croatian
Defense date2015-04-30
Promoted date2016-04-15
Parallel abstract (English)
Satellite positioning signal ionospheric delay has been identified as a single major contributor in total satellite positioning error budget. Daily dynamics of ionospheric delay are described globally by utilising the GPS standard (Klobuchar) ionospheric model. In this doctoral thesis, a regional ionospheric delay correction model has been proposed. The model is based on observed daily pattern ionospheric delay non-specific regularities, which are occuring under specified conditions; during quiet space weather, undisturbed ionosphere, in summer months period and at middle geographic latitudes. The local ionospheric delay dynamics are the reason and a motivation for conducted research, which was carried out aiming at GNSS services improvement and system performance. The model is developed on the basis of measured values of ionospheric delay. These values were derived from code and phase pseudorange observables from Adriatic region reference IGS stations. The model has been verified in time periods where defined conditions of satellite positioning signal propagation environment were prevailing. Obtained values were compared with actual ionospheric delay values, as well as with ionospheric delay values obtained with the Klobuchar ionospheric correction model. The proposed model has been tested in three different locations in the Adriatic region, in years 2006 and 2007. The results showed that, under specified conditions and controlling parameters, proposed ionospheric model provides more accurate ionospheric delay corrections compared to the Klobuchar model. The proposed model's applicability in the Adriatic region and surrounding has been confirmed. Model properties have been discussed from the accomplishment, advantages and limitations aspect. The potential of the model's scientific and practical appliance is presented, along with thesis research results. A model error analysis and error causes will set guidelines for further research activities regarding local and global ionospheric dynamics conditions, as well as solar and geomagnetic activity exploration.
Parallel keywords (Croatian)Globalni sustav za satelitsko određivanje položaja globalni navigacijski satelitski sustav ionosfersko kašnjenje signala za satelitsko određivanje položaja ukupni sadržaj elektrona model ispravke ionosferskog kašnjenja srednje geografske širine Jadranska regija
Versionaccepted version
Resource typetext
Access conditionAccess restricted to students and staff of home institution
Terms of usehttp://rightsstatements.org/vocab/InC/1.0/
Noteaccepted version
URN:NBNhttps://urn.nsk.hr/urn:nbn:hr:187:517854
CommitterDolores Markotić