Sekundarni jezik: |
Angleški jezik |
Sekundarni naslov: |
Quality analysis of the position determination in GNSS networks |
Sekundarni povzetek: |
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. |
Sekundarne ključne besede: |
geodesy;master of science thesis;GNSS;error sources;reference station;GNSS network;MAC;VRS;i-MAX;FKP;RTCM 3.1; |
Vrsta datoteke: |
application/pdf |
Vrsta dela (COBISS): |
Magistrsko delo |
Komentar na gradivo: |
Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo, Oddelek za geodezijo |
Strani: |
XXIV, 215 str. |
Vrsta dela (ePrints): |
thesis |
Naslov (ePrints): |
Analiza kakovosti določitve položaja v omrežjih postaj GNSS |
Ključne besede (ePrints): |
GNSS;vplivi na opazovanja;referencna postaja;omrežje postaj;MAC;VRS;i-MAX;FKP;RTCM 3.1 |
Ključne besede (ePrints, sekundarni jezik): |
GNSS;error sources;reference station;GNSS network;MAC;VRS;i-MAX;FKP;RTCM 3.1 |
Povzetek (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. |
Povzetek (ePrints, sekundarni jezik): |
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. |
Ključne besede (ePrints, sekundarni jezik): |
GNSS;error sources;reference station;GNSS network;MAC;VRS;i-MAX;FKP;RTCM 3.1 |
ID: |
8327147 |