diplomska naloga št.: 210/II. GIG
Žiga Obrstar (Author), Polona Pavlovčič Prešeren (Mentor)

Abstract

Moduli u-blox so majhni nizkocenovni sprejemniki GNSS, ki lahko dosežejo visoko kakovost določitve položaja. Njihova pomanjkljivost se pokaže pri visoki občutljivosti na odboje signalov GNSS. V nalogi smo raziskovali, kako različne podlage s kovinskimi obroči, ki lahko zmanjšajo vpliv odbojev signalov, vplivajo na občutljivost modula u-blox za sprejem signala. V prvi izmeri, izvedeni novembra 2021 na strehi Fakultete za gradbeništvo in geodezijo Univerze v Ljubljani, smo preverjali vpliv večpotja le na modul u-blox za situacijo, ko je izvajal opazovanja z ali brez kovinske podlage. V drugi izmeri marca 2022 smo na strehi istočasno izvajali opazovanja z modulom u-blox, ki je imel nameščeni kovinski podlagi proizvajalcev Leica in Javad. Za boljšo primerjavo odbojev signalov smo opazovanja izvedli tudi s sprejemnikom proizvajalca Ardusimple in sprejemnikom Leica GS18T. Uporabljena kovinska podlaga Leica je bila sposobna odpraviti zgolj odbite signale sistema GPS, kovinska podlaga Javad pa odbite signale sistemov GPS, GLONASS, Galileo in BeiDou. V naknadni obdelavi opazovanj smo primerjali vrednosti RMS, ki so se nanašali na odboje signalov, sprejetih z različnimi instrumenti. Vrednosti smo razdelili glede na posamezne frekvence (L1, L2 in E5b) in satelitske sisteme (GPS, GLONASS, Galileo in vsi satelitski sistemi skupaj). Izkazalo se je, da je bil sprejemnik u-blox bistveno bolj občutljiv na vpliv večpotja s katerokoli kovinsko podlago kot sprejemnik Leica GS18T. Z nameščeno podlago Leica so odboji signalov imeli manjši vpliv kot na anteno Ardusimple, ravno obratno pa z nameščeno podlago Javad.

Keywords

geodezija;diplomske naloge;GIG;GNSS;odboj signala;u-blox;statična metoda;kovinski obroči;Ardusimple;Leica GS18T;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL FGG - Faculty of Civil and Geodetic Engineering
Publisher: [Ž. Oberstar]
UDC: 528.28(043.2)
COBISS: 139895299 Link will open in a new window
Views: 1453
Downloads: 125
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Other data

Secondary language: English
Secondary title: Multipath signal GNSS assessment of u-blox receiver with antenna choke rings
Secondary abstract: The u-blox modules are small and inexpensive GNSS receivers that can be used for high-quality positioning. However, they are very sensitive to multipath effects from GNSS signals, resulting in lower position accuracy. In the thesis, we analysed this sensitivity using different choke ring antennas that can improve the ability of the receivers to remove the multipath effect. During the first observations in November 2021 on the roof of the Faculty of Civil and Geodetic Engineering, University of Ljubljana, we studied only the effect of multipath on the u-blox module with or without antenna choke ring. In the second from March 2022, simultaneous observations we used the u-blox module with Leica and Javad choke ring antennas, but this time we also used the Ardusimple receiver and the Leica GS18T receiver for better comparison of multipath effects. The Leica choke ring antenna can only remove multipath from GPS signals, while the Javad choke ring antenna can remove multipath from GPS, GLONASS, Galileo and BeiDou signals. During the observations, we compared RMS values representing the magnitude of the multipath effect. The values were compared for different frequencies (L1, L2 and E5b) and satellite systems (GPS, GLONASS, Galileo and all satellite systems combined). The results show that the multipath effect affects the u-blox module with any choke ring antenna type more than the Leica GS18T receiver. The multipath effect affects the Ardusimple antenna more than the u-blox module with Leica choke ring, and it is the opposite for Javad choke ring.
Secondary keywords: geodesy;graduation thesis;GNSS;multipath effect;u-blox;static mode;antenna choke rings;Ardusimple;Leica GS18T;
Type (COBISS): Bachelor thesis/paper
Thesis comment: Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Pages: X, 42 str., 10 str. pril.
ID: 17899470