Temat: multipath - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Spectral analysis of multi-year GNSS code multipath time-series
Autorzy:: Kudrys, Jacek
Tematy:: GNSS
code multipath
spectral analysis
spectral index; Pokaż więcej
Wydawca:: Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Powiązania:: https://bibliotekanauki.pl/articles/390405.pdf Link otwiera się w nowym oknie
Opis:: In the presented study multi-year time series of changes in the L1 pseudo-range multipath are analysed. Data from 8 stations of the EUREF Permanent Network (EPN) were used in the study. Periodic components present in the signal and their stability over time were analysed. Also, the type of background noise was determined, based on the spectral index. In some cases, the presence of weak components with a 1/2 and 1/3 of the Chandler period has also been found. Time-frequency analysis shows that periodic signals are not stationary in most of the examined cases, and particular signal components occur only temporarily. The analysed signals were char-acterised by pink noise in the lower frequency range and by white noise for higher frequencies, which is also characteristic for time series of coordinates obtained from GNSS measurements.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Impacts of forest spatial structure on variation of the multipath phenomenon of navigation satellite signals
Autorzy:: Brach, Michał
Stereńczak, Krzysztof
Bolibok, Leszek
Kwaśny, Łukasz
Krok, Grzegorz
Laszkowski, Michał
Tematy:: GNSS
multipath
random forest
Borut
forest structure
LiDAR; Pokaż więcej
Wydawca:: Instytut Badawczy Leśnictwa
Powiązania:: https://bibliotekanauki.pl/articles/2044153.pdf Link otwiera się w nowym oknie
Opis:: The GNSS (Global Navigation Satellite System) receivers are commonly used in forest management in order to determine objects coordinates, area or length assessment and many other tasks which need accurate positioning. Unfortunately, the forest structure strongly limits access to satellite signals, which makes the positioning accuracy much weak comparing to the open areas. The main reason for this issue is the multipath phenomenon of satellite signal. It causes radio waves reflections from surrounding obstacles so the signal do not reach directly to the GNSS receiver’s antenna. Around 50% of error in GNSS positioning in the forest is because of multipath effect. In this research study, an attempt was made to quantify the forest stand features that may influence the multipath variability. The ground truth data was collected in six Forest Districts located in different part of Poland. The total amount of data was processed for over 2,700 study inventory plots with performed GNSS measurements. On every plot over 25 forest metrics were calculated and over 25 minutes of raw GNSS observations (1500 epochs) were captured. The main goal of this study was to find the way of multipath quantification and search the relationship between multipath variability and forest structure. It was reported that forest stand merchantable volume is the most important factor which influence the multipath phenomenon. Even though the similar geodetic class GNSS receivers were used it was observed significant difference of multipath values in similar conditions.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Odbiorniki GNSS w praktyce inżynierskiej. Wpływ typu anteny na jakość pomiarów GNSS
GNSS receivers in engineering practice. Impact of antenna type on quality of GNSS measurements
Autorzy:: Perski, A.
Wieczyński, A.
Baczyńska, M.
Bożek, K.
Kapelko, S.
Pawłowski, S.
Tematy:: GPS
GNSS
antena
zakłócenia wielodrogowości sygnału
patch
choke ring
stealth
badania stacjonarne
błąd wyznaczania pozycji 2DRMS
multipath error
measuring error 2DRMS
choke-ring
antenna
stationary test
position scatter; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Powiązania:: https://bibliotekanauki.pl/articles/277847.pdf Link otwiera się w nowym oknie
Opis:: W trzecim z serii artykułów przedstawiono wyniki badań stacjonarnych sześciu jednakowych odbiorników odbierających w tym samym czasie sygnały GNSS za pomocą anten różnych typów. Badania wykonano z wykorzystaniem płyt ewaluacyjnych wyposażonych w nowoczesne, jednoczęstotliwościowe odbiorniki GNSS skonfigurowane do pracy w trybie „wyłącznie GPS”. W trakcie badań wykonano trzy sesje pomiarowe w środowiskach o zróżnicowanym stopniu utrudnienia odbioru sygnałów GNSS. Uzyskane wyniki wskazują, że w aplikacjach przeznaczonych na rynek masowy wykorzystujących tanie odbiorniki GNSS właściwy dobór anteny może istotnie poprawić jakość i funkcjonalność produktu.
In the third article of a series we present the results of our researches performed in stationary conditions. We also give some explanations and guidelines about the most important features, classification and parameters of GNSS antennas and its influence on GNSS receiver’s performance. Phase Center Variation (PCV) and multipath effect mitigation techniques are briefly described. In performed researches, six exactly the same models of GNSS receivers worked at the same time with different models of antennas. The study was performed with the use of specially prepared evaluation boards, which were equipped with modern single frequency GNSS receivers configured to operate as a GPS only mode. Three test sessions, each in different environments of varying difficulty for receiving GNSS signals were carried out. The results show that also for applications using cheap GNSS receivers and aimed to the mass market, the proper selection of antennas can significantly improve the quality and functionality of the products.
Dostawca treści:: Biblioteka Nauki

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