magistrsko delo
Gregor Bilban (Author), Bojan Stopar (Mentor), Mojca Kosmatin Fras (Thesis defence commission member), Miran Kuhar (Thesis defence commission member), Polona Pavlovčič Prešeren (Thesis defence commission member), Tomaž Ambrožič (Thesis defence commission member)

Abstract

Analiza kakovosti določitve položaja v omrežjih postaj GNSS

Keywords

geodezija;magistrska dela;GNSS;vplivi na opazovanja,;referenčna postaja;omrežje postaj;MAC;VRS;i-MAX;FKP;RTCM 3.1;

Data

Language: Slovenian
Year of publishing:
Source: Ljubljana
Typology: 2.09 - Master's Thesis
Organization: UL FGG - Faculty of Civil and Geodetic Engineering
Publisher: [G. Bilban]
UDC: 528.2:528.5(043)
COBISS: 6472801 Link will open in a new window
Views: 2239
Downloads: 558
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Other data

Secondary language: English
Secondary title: Quality analysis of the position determination in GNSS networks
Secondary abstract: RTK is most widely used method of surveying with GNSS today. Conventional RTK positioning system typically comprises of a single reference station and a rover. The later combines observations from both stations and provides a baseline estimate. The accuracy of such approach is limited by the spatial decorrelation of error sources mainly induced by the atmosphere and ephemerides. With the increasing distance between reference station and rover it is no more possible to eliminate errors using traditional double-differencing. However, they can be successfully modeled using a group of reference stations. GNSS network consist of reference stations that are connected to a central processing facility. Observations of all reference stations are processed together in order to determine distant dependent errors across the network. In the master's thesis different network approaches were studied with the main focus on determination and dissemination of RTK corrections following Master-Auxiliary concept. As part of the thesis own GNSS network was established that resembled Slovenian national network SIGNAL in the biggest extent possible. Several 24-hour measurements with 4 identical GNSS receivers were performed to evaluate rover performances in each network based on different network approaches and different RTK products. Testing points were carefully selected inside the network in order to study the quality of the position determination at different distances to the closest reference station and the influence of measurement interval on the position quality. The correctness of RTCM messages and the required bandwidth were also evaluated. Based on the investigated benefits and drawbacks of respective network approaches and the analysis of field measurements recommendations to both rover users and network operators were suggested.
Secondary keywords: geodesy;master of science thesis;GNSS;error sources;reference station;GNSS network;MAC;VRS;i-MAX;FKP;RTCM 3.1;
File type: application/pdf
Type (COBISS): Master's thesis
Thesis comment: Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo, Oddelek za geodezijo
Pages: XXIV, 215 str.
Type (ePrints): thesis
Title (ePrints): Analiza kakovosti določitve položaja v omrežjih postaj GNSS
Keywords (ePrints): GNSS;vplivi na opazovanja;referencna postaja;omrežje postaj;MAC;VRS;i-MAX;FKP;RTCM 3.1
Keywords (ePrints, secondary language): GNSS;error sources;reference station;GNSS network;MAC;VRS;i-MAX;FKP;RTCM 3.1
Abstract (ePrints): Danes je za določitev položaja s satelitskimi navigacijskimi sistemi najbolj razširjena relativna metoda izmere RTK-GNSS, pri kateri se izkorišča dejstvo, da so vplivi na opazovanja prostorsko in časovno korelirani. Problem uporabe enega referenčnega sprejemnika izvira iz vplivov na opazovanja GNSS, ki so odvisna od oddaljenosti med obema sprejemnikoma in se v postopkih tvorjenja faznih razlik ne izničijo v celoti. Te vplive je mogoče zanesljivo modelirati s pomočjo opazovanj množice referenčnih sprejemnikov, ki obkrožajo premični sprejemnik. Omrežje GNSS običajno sestavlja vsaj 5 referenčnih postaj, ki so povezane z osrednjim računalnikom, kjer se s skupno obdelavo vseh opazovanj določijo prostorsko odvisni vplivi na opazovanja v celotnem omrežju. V magistrskem delu so predstavljeni različni mrežni koncepti s poudarkom na konceptu Master-Auxiliary predvsem s stališča določitve in razpošiljanja popravkov RTK. V sklopu magistrskega dela je bilo vzpostavljeno lastno omrežje GNSS, ki je bilo v največji možni meri podobno državnemu omrežju SIGNAL. Analizirane so bile zmogljivosti obeh omrežij s stališča kakovosti določitve položaja ob uporabi različnih mrežnih konceptov ter različnih proizvodov RTK v odvisnosti od oddaljenosti od najbližje referenčne postaje ter vpliv dolžine trajanja meritve na kakovost določitve položaja. Preverila se je pravilnost vsebine sporočil RTCM, ki sta jih omrežji posredovali premičnim sprejemnikom, ter ocenila potrebna pasovna širina za pošiljanje popravkov RTK. V ta namen so bile izbrane štiri testne točke, na katerih so bila opravljena 24-urna opazovanja s štirimi sprejemniki GNSS. Na podlagi preučitve prednosti in slabosti različnih mrežnih konceptov ter analize terenskih meritev so bila podana priporočila upravljavcem in uporabnikom omrežij GNSS.
Abstract (ePrints, secondary language): RTK is most widely used method of surveying with GNSS today. Conventional RTK positioning system typically comprises of a single reference station and a rover. The later combines observations from both stations and provides a baseline estimate. The accuracy of such approach is limited by the spatial decorrelation of error sources mainly induced by the atmosphere and ephemerides. With the increasing distance between reference station and rover it is no more possible to eliminate errors using traditional double-differencing. However, they can be successfully modeled using a group of reference stations. GNSS network consist of reference stations that are connected to a central processing facility. Observations of all reference stations are processed together in order to determine distant dependent errors across the network. In the master's thesis different network approaches were studied with the main focus on determination and dissemination of RTK corrections following Master-Auxiliary concept. As part of the thesis own GNSS network was established that resembled Slovenian national network SIGNAL in the biggest extent possible. Several 24-hour measurements with 4 identical GNSS receivers were performed to evaluate rover performances in each network based on different network approaches and different RTK products. Testing points were carefully selected inside the network in order to study the quality of the position determination at different distances to the closest reference station and the influence of measurement interval on the position quality. The correctness of RTCM messages and the required bandwidth were also evaluated. Based on the investigated benefits and drawbacks of respective network approaches and the analysis of field measurements recommendations to both rover users and network operators were suggested.
Keywords (ePrints, secondary language): GNSS;error sources;reference station;GNSS network;MAC;VRS;i-MAX;FKP;RTCM 3.1
ID: 8327147