Proceedings ArticleDOI
Comparing the ‘Big 4’ - A User's View on GNSS Performance
Oliver Montenbruck,Peter Steigenberger,André Hauschild +2 more
- pp 407-418
TLDR
The determination and prediction of GNSS satellite orbits and clocks from measurements of global receiver networks, which forms the basis for precise point positioning applications, are discussed and the significance of satellite metadata knowledge is highlighted.Abstract:
With BeiDou-3 and Galileo complementing the legacy systems GPS and GLONASS, a total of four global navigation satellite systems (GNSS) has now become available that offer free and ubiquitous access to accurate positioning, navigation, and timing (PNT). Following an overview of the system status and capabilities, we compare the Big 4 GNSSs in terms of signal and clock characteristics. The signal-in-space range error (SISRE) are assessed and related to the achievable single-point positioning accuracy. Furthermore, service stability and availability aspects are adressed. With respect to geodetic users, we discuss the determination and prediction of GNSS satellite orbits and clocks from measurements of global receiver networks, which forms the basis for precise point positioning applications. Within the International GNSS Service (IGS) various analysis centers independently provide such products based on data of the IGS multi-GNSS network. The challenges in generating precise orbit and clock solutions for the individual constellations are discussed, and the significance of satellite metadata knowledge is highlighted.read more
Citations
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Journal ArticleDOI
Featured services and performance of BDS-3
TL;DR: The results show that the inter-satellite link (ISL) contributes a lot to the accuracy improvement of orbit determination and time synchronization for the whole constellation.
Principle and performance of BDSBAS and PPP-B2b of BDS-3
Journal ArticleDOI
Past, present and future of atomic clocks for GNSS
TL;DR: In this article, the authors discuss how far and in what directions, atomic clock technology should be pushed to provide maximum benefits to GNSS performance, reliability and cost, and provide a baseline by reviewing current GNSS satellite atomic clock technologies.
Journal ArticleDOI
Multi-GNSS Combined Orbit and Clock Solutions at iGMAS
TL;DR: In this paper , a combination method of iGMAS orbit and clock products is described, and the performance of the combined solutions is evaluated by various means, which indicates that consistent weights should be assigned for individual constellations and analysis centers included in the combination.
Performance Evaluation of the Early CNAV Navigation Message
TL;DR: In this article, a signal-in-space range error (SISRE) of about 1.1 m is obtained for the CNAV message whereas it is 0.6 m for the legacy navigation message (LNAV).
References
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Handbook of Frequency Stability Analysis | NIST
William Riley,David A. Howe +1 more
TL;DR: Handbook of Radar MeasurementElectronics Engineers' Handbook and Handbook of Astronautical EngineeringHandbook for High-Vacuum EngineeringRadio Communication HandbookThe Complete FM 2-way Radio HandbookMissile Engineering HandbookUnderstanding Quartz Crystals and Oscillators Handbook of Semiconductor ElectronicsElectronics engineers' handbookRadio and Electronic Laboratory HandbookSpringer Handbook of Global Navigation Satellite SystemsHandbook as discussed by the authors, Handbook of Electrical Power System Dynamics, Handbook of Scientific Instruments and ApparatusNuclear Power Reactor Instrumentation Systems Handbook, Handbook for Electronics Engineering TechniciansASHRAE Handbook
Book ChapterDOI
Precise Point Positioning
TL;DR: This chapter introduces the PPP concept and specifies the required models needed to correct for systematic effects causing centimeter-level variations in the satellite-to-user range, including the solution of station tropospheric zenith path delays and receiver clocks, with millimeter and nanosecond precision respectively.
Journal ArticleDOI
Geocenter coordinates estimated from GNSS data as viewed by perturbation theory
TL;DR: In this paper, a fair agreement for GPS and GLONASS was found in the geocenter x-and y-coordinate series, which can be explained by first-order perturbation theory of celestial mechanics.
Journal ArticleDOI
Optimum Semicodeless Carrier-Phase Tracking of L2
TL;DR: In this paper, the authors presented five additional techniques that can be used to reconstruct the L2 carrier without knowledge of the W-code, including code-aided L2 costas loop with W-bit integrate and dump arm filtering, P-code aided L1, L2 cross correlation, Soft decision Z-tracking, Optimum L2 demodulation motivated by maximum a posteriori (MAP) estimation theory, and linear approximation of the MAP approach.
Theory and Performance of the Pulse Aperture Correlator
TL;DR: NovAtel’s Pulse Aperture Correlator (PAC) tracking loop is introduced which takes full advantage of the Narrow Correlators spacing design, but in addition, is much more resistant to multipath effects on the correlation function and thereby reduces the multipath bias on the pseudorange measurements.
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