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Noises in Double-Differenced GNSS Observations

Author

Listed:
  • Dominik Prochniewicz

    (Faculty of Geodesy and Cartography, Warsaw University of Technology, 00-661 Warsaw, Poland)

  • Jacek Kudrys

    (Department of Integrated Geodesy and Cartography, AGH University of Science and Technology, 30-059 Krakow, Poland
    Joint International Tourism College, Hainan University—Arizona State University, Haikou 570228, China)

  • Kamil Maciuk

    (Department of Integrated Geodesy and Cartography, AGH University of Science and Technology, 30-059 Krakow, Poland
    Joint International Tourism College, Hainan University—Arizona State University, Haikou 570228, China)

Abstract

Precise data processing from the Global Navigation Satellite Systems (GNSS) reference station network is mainly based on a combination of double-differenced carrier phase and code observations. This approach allows most of the measurement errors to be removed or reduced and is characterized as the most accurate method. However, creating observation differences between two receivers and two satellites increases the measurement noise of the observations by a factor of 2. As a result, it increases the impact of the incorrect definition of the noise characteristic on the results of the estimation of the unknowns in the positioning model. This is especially important in Multi-GNSS solutions, which integrate measurements from different systems, for which the stochastic parameters of observation may differ significantly. In this paper, the authors prepared a complex analysis of the noise type in double-differenced GNSS (GPS, GLONASS and Galileo) observations, both carrier phase and code ones, with a 1 s sampling interval. The Autocorrelation Function (ACF) method, the Lomb–Scargle (L-S) periodogram method, and the Allan variance (AVAR) method were used. The results that were obtained for the weekly set of measurement data showed that, depending on the system and type of observation, the noise level and its type are significantly different. Among the code measurements, the lowest noise levels were obtained for the GPS C5Q and Galileo C7Q/C8Q observations, with the standard deviations not exceeding ±10 cm, while the noisiest observations were for the GLONASS C1C and C2C signals, which had standard deviations of about ±90 cm and ±45 cm, respectively. For the carrier phase observations, each signal type was characterized by very similar noise levels of ±1.5–3.5 mm. The ACF analysis showed that 1 Hz double-differenced GNSS data can only be treated as being not correlated to time for carrier phase observations; for code observations, an irrelevant autocorrelation may be considered for measurement intervals greater than 20 s. Depending on the GNSS signals, the spectral index k varies in a range from −1.3 to −0.2 for code data and k = 0.0 in the case of phase data. Using the modified Allan deviation (MDEV) allows for specific noise types for each signal and GNSS system to be determined. All of the code observations were characterized by either flicker PM or white PM. In the case of the phase observations, they were all uniquely characterized by white PM (GPS and Galileo or by white PM and flicker PM (GLONASS).

Suggested Citation

  • Dominik Prochniewicz & Jacek Kudrys & Kamil Maciuk, 2022. "Noises in Double-Differenced GNSS Observations," Energies, MDPI, vol. 15(5), pages 1-18, February.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:5:p:1668-:d:756881
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    References listed on IDEAS

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    1. Xavier Gabaix, 2009. "Power Laws in Economics and Finance," Annual Review of Economics, Annual Reviews, vol. 1(1), pages 255-294, May.
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    1. Karolina Krzykowska-Piotrowska & Mirosław Siergiejczyk, 2022. "On the Navigation, Positioning and Wireless Communication of the Companion Robot in Outdoor Conditions," Energies, MDPI, vol. 15(14), pages 1-4, July.

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