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Tekst (do odczytu wzrokowego)
Wymiary/waga
szerokość
170
mm
wysokość
240 mm
głębokość
7
mm
ciężar
100
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liczba stron całej zawartości
88
Strony
Opis bibliograficzny
Tytuł
Multi-GNSS precise point positioning using stochastic modeling of the clock parameter
Twórca
autor
Mikoś, Marcin
Wydanie
typ wydania
Wydanie
numer wydania
1
miejsce wydania
Kalety
Język
język publikacji
angielski
Wydawca
imprint
KRZYSZTOF SOŚNICA, Uniwersytet Przyrodniczy we Wrocławiu, Instytut Geodezji i Geoinformatyki
pełna nazwa wydawcy
Data
data wydania
2022-08-01
data upublicznienia metadanych
2022-08-01
Opis marketingowy
Tekst promocyjny
The quality of the International GNSS Service (IGS) station coordinates depends, among other things, on the type of oscillator located at the station in undifferenced GNSS solutions. A distinction of the clock standards can be made between internal, rubidium, cesium, and hydrogen maser clocks. The stability of time standards can vary by several orders of magnitude depending on the type of clock. High accuracy clocks allow for the introduction of stochastic modeling in the absolute positioning algorithms which contributes to faster solution convergence and superior position accuracy.
In the Precise Point Position (PPP) measurement technique based on multi-GNSS, the clock parameter may be determined in two ways. Either it is estimated separately for each system or a single clock parameter is determined for all systems, taking into account the inter-system biases.
In this study, the stability of the station clocks is analyzed from PPP solutions for selected IGS stations using GPS, GLONASS, Galileo, and BeiDou-2 data. All analyses for the clock parameter are conducted for different types of oscillators along with the performance characteristics for each system. The quality of the oscillator has been verified by inter-epoch stability along with the detection of discontinuities at day boundaries that cause spikes in the clock parameter. Fast Fourier Transform and Modified Allan Deviation are used in the analyses to determine the dominant signals and to characterize the time and frequency stability of the GNSS-specific clock component parameters. The stability of inter-system clock solutions is analyzed, as well.
As a result, the inter-epoch analysis helps to provide a value for the random walk constraint introduced as a stochastic parameter in the positioning algorithm. The analyses show that the errors associated with the repeatability of different GNSS systems cannot be identified in the time series of the clock parameters. In GNSS clock parameters, errors in diurnal and semidiurnal domains dominate, indicating the influence of local environmental conditions on the oscillator performance. An important advantage of modeling the clock parameter is to stabilize the station vertical coordinate component
in multi-GNSS PPP solutions. In the example of the PTBB station, the use of modeling improved the stability of the vertical component by 10 mm (about 31%) by the means of the root mean square (RMS) error.
In the Precise Point Position (PPP) measurement technique based on multi-GNSS, the clock parameter may be determined in two ways. Either it is estimated separately for each system or a single clock parameter is determined for all systems, taking into account the inter-system biases.
In this study, the stability of the station clocks is analyzed from PPP solutions for selected IGS stations using GPS, GLONASS, Galileo, and BeiDou-2 data. All analyses for the clock parameter are conducted for different types of oscillators along with the performance characteristics for each system. The quality of the oscillator has been verified by inter-epoch stability along with the detection of discontinuities at day boundaries that cause spikes in the clock parameter. Fast Fourier Transform and Modified Allan Deviation are used in the analyses to determine the dominant signals and to characterize the time and frequency stability of the GNSS-specific clock component parameters. The stability of inter-system clock solutions is analyzed, as well.
As a result, the inter-epoch analysis helps to provide a value for the random walk constraint introduced as a stochastic parameter in the positioning algorithm. The analyses show that the errors associated with the repeatability of different GNSS systems cannot be identified in the time series of the clock parameters. In GNSS clock parameters, errors in diurnal and semidiurnal domains dominate, indicating the influence of local environmental conditions on the oscillator performance. An important advantage of modeling the clock parameter is to stabilize the station vertical coordinate component
in multi-GNSS PPP solutions. In the example of the PTBB station, the use of modeling improved the stability of the vertical component by 10 mm (about 31%) by the means of the root mean square (RMS) error.
Nota biograficzna
Marcin Mikoś received his Master of Engineering in Geodesy and Cartography from the Wroclaw University of Environmental and Life Sciences in 2022, and is currently a PhD student at the indicated university. His main task includes multi-GNSS positioning with clock modeling.
Nakład
pierwszy nakład
17
Dystrybutor/Dystrybutorzy
Instytut Geodezji i Geoinformatyki, Uniwersytet Przyrodniczy we Wrocławiu
telefon 713205617
email marcin.mikos@upwr.edu.pl
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Inne gałęzie techniki i nauki stosowane
Temat
GNSS
Temat
Satellite Geodesy
Temat
Atomic clocks
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