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Võrgu RTK mõõteseeriate täpsus

Precision of the Data Series measured by Network RTK
Authors: Svežova, Margarita;

Võrgu RTK mõõteseeriate täpsus

Abstract

The aim of this Master´s Thesis is to study the precision of the RTK method and its stability of different RTK base station networks (RTN) in Estonia. To achieve the aim twohour RTK data series were measured using GPS, GLONASS, Galileo satellite systems and Trimble VRS Now, HadNet, Land Board RTN service and single RTK base station. Using the same network service two data series were saved: one seria was measured by using only GPS signals and second seria by GPS, GLONASS and Galileo signals. Galileo satellite system was available only in the Trimble VRS Now network. At the field nearest station RTK, i-MAX, VRS RTK correction streams were tested. Field work was conducted at the 21. november to 28. november 2018 at the temporary geodetic point, which is located in Kalina village, Alutaguse municipality, Ida-Viru county. In practical work GNSS receiver Trimble R4-3, handheld computer Trimble Juno T41 were used and program Microsoft Excel for archiving and analyzing the data series. The base value of the test point was determined by static measurements, postprocessing was made in Trimble Business Center package. Using MS Excel average value of each data series, standard deviations and differences of the X, Y and h in relation to testpoint was found. Also common average value from all data series have been compared against static measurement. Based on the results, it is visible that RTK measurements fluctuate within a few centimeters only. Occationally the height error reaches up to 6 cm and standard deviation remains below 2 cm. The best results have been achieved using with Trimble VRS Now and Land Board VRS service. Shortly stayed behind measurements precisions, which were made with HadNet VRS, Toila base station and Land Board´s i-MAX service. Also can be concluded that precision of ellipsoidal height, which is measured using only GPS signals, is better than height, measured using GNSS signals. Specially smaller number of occational errors can be detected. Meanwhile, measurement with combined signals raises the X, Y coordinates precision.

Käesoleva magistritöö eesmärgiks on uurida RTK meetodi täpsust ja selle stabiilsust Eesti erinevates püsijaamade võrkudes. Eesmärgi saavutamiseks viidi läbi kahetunnised RTK mõõteseeriad kasutades GPS, GLONASS ja Galileo satelliitsüsteeme ning Trimble VRS Now, HadNet, Maa-ameti RTN teenust ning üksikut RTK tugijaama. Sama võrgu teenust kasutades salvestati kaks andmeseeriat: esimest seeriat mõõdeti ainult GPS signaalidega ning teist GPS, GLONASS ja osalt ka Galileo signaalide abil. Galileo satelliitsüsteem oli kättesaadav ainult Trimble VRS Now võrgus. Välitööde ajal kasutati RTK lähima jaama (Nearest station) meetodit, i-MAX, RTK VRS ja kiirstaatilist (Fast-Static) mõõtmismeetodit. Mõõtmiseid sooritati perioodil 21.–28.11.2017 ajutisel geodeetilisel punktil, mis asub Kalina külas, Alutaguse vallas, Ida-Virumaal. Kasutati GNSS vastuvõtjat Trimble R4-3, väliarvutit Trimble Juno T41 ning andmete arhiveerimiseks ja analüüsimiseks Microsoft Excelit. Testpunkti alusväärtus määrati kahe tunnilise staatilise mõõtmisega ja järeltöötlusega programmis Trimble Business Center. MS Excelis leiti iga andmeseeria keskmine väärtus, standardhälbed ning X, Y koordinaadi ja ellipsoidaalse kõrguse erinevus testpunkti alusväärtusest. Samuti võrreldi kõigi mõõteseeriate keskmisi väärtusi staatilise mõõtmisega. Tulemuste põhjal võib öelda, et RTK ja võrgu RTK mõõtmiste tulemused kõiguvad mõne sentimeetri piires. Kõrgustes esineb vähesel määral üksikuid juhuslike vigu ka kuni 6 cm, standardhälbed jäävad siiski alla 2 cm. Parimad tulemused on saavutatud Trimble VRS Now ja Maa-ameti püsijaama võrgu VRS teenuse abil. Veidi jäid maha HadNet VRS, Toila baasjaama ja Maa-ameti võrgu i-MAX teenuse abil tehtud mõõtmiste täpsused. Esineb ka süstemaatilisi vigu. Samuti võib järeldada, et ainult GPS signaalidega mõõtes on ellipsoidaalse kõrguse täpsus enamasti parem kui GPS, GLONASS, Galileo signaalidega mõõtes. Eriti hakkab silma väiksem juhuslike vigade arv. Samas kombineeritud signaalidega mõõtmine tõstab X ja Y koordinaatide määramise täpsust.

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Estonia
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Keywords

geodeetilised mõõdistamised, maamõõtmine, magistritööd

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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