Journal ArticleDOI
Exploiting GNSS signal structure to enhance observability
Marco Pini,Dennis Akos +1 more
TLDR
This paper describes a new approach to achieve observability based on signal processing techniques, such as dithering and averaging, which leverage the repetitive nature of the GNSS signal, allowing for the direct analysis of GNSS signals using traditional front end designs and conventional antennas.Abstract:
There are a number of different error sources, such as multipath and thermal noise, which corrupt satellite navigation waveforms from their theoretical structure. However, even under ideal conditions the broadcast signals have some degree of deformation as a result of the practical individual hardware implementation. For the most demanding users of satellite navigation, such as aircraft navigation and landing systems, it is important to characterize the nominal signal structure in order to detect minimal variations resulting from hardware-based errors. Thus far such precorrelation Global Navigation Satellite System (GNSS) signal quality monitoring has been performed through high gain antennas, which allow for raising the GNSS spectrum above the thermal noise floor and observing the structure of the signal directly at the front end output. This paper describes a new approach to achieve such observability based on signal processing techniques, such as dithering and averaging, which leverage the repetitive nature of the GNSS signal. The paper presents how these techniques can drastically improve the signal-to-noise ratio (SNR) in postprocessing, allowing for the direct analysis of GNSS signals using traditional front end designs and conventional antennas. Results are predicted using the appropriate theory and validated using data collected from the Global Positioning System (GPS).read more
Citations
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Journal ArticleDOI
Low Complexity Carrier-to-Noise Ratio Estimators for GNSS Digital Receivers
TL;DR: It is concluded that a number of low-complexity algorithms for SNR estimation, based on a simple communication signal model, can be tailored to digital GNSS receivers.
Journal ArticleDOI
Design of a Configurable Monitoring Station for Scintillations by Means of a GNSS Software Radio Receiver
TL;DR: This letter addresses the design and implementation of a monitoring station for Global Navigation Satellite Systems signals based on the software-defined radio paradigm, which yields valuable advantages in critical and remote areas, such as polar regions, where resources are limited and installation, maintenance, and replacement of hardware may be critical.
Dissertation
Modeling and monitoring of new GNSS signal distortions in the context of civil aviation
TL;DR: This dissertation aims at proposing new distortions models associated to the new GPS and Galileo signals that will be used by civil aviation after 2020, and built an appropriate monitor, referred to as SQM that is able to detect any distortion from the proposed TMs (for new signals) that could lead to a position integrity failure.
Journal ArticleDOI
An Open-Loop Receiver Architecture for Monitoring of Ionospheric Scintillations by Means of GNSS Signals
Nicola Linty,Fabio Dovis +1 more
TL;DR: An alternative architecture and a related metric based on the statistical processing of the received signal, after a code-wipe off and a noise reduction phase are investigated, which can be obtained at a higher rate as well as in the case of strong scintillations when a closed-loop receiver would fail the tracking of the GNSS signals.
Journal ArticleDOI
Oscillator Frequency Offset Impact on Software GPS Receivers and Correction Algorithms
Yanhong Kou,Yu Morton +1 more
TL;DR: Several online clock error correction algorithms are presented to produce unbiased measurements and clock error estimates with known and unknown front end frequency plans and with and without signal tracking and navigation solutions for single- and dual-frequency receivers on both static and dynamic platforms.
References
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Book
Understanding GPS : principles and applications
TL;DR: In this paper, the authors discuss the effects of RF interference on GPS Satellite Signal Receiver Tracking (GSRSR) performance and the integration of GPS with other Sensors, including the Russian GLONASS, Chinese Bediou, and Japanese QZSS systems.
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Global Positioning System: Signals, Measurements, and Performance
TL;DR: This advanced tutorial will describe the GPS signals, the various measurements made by the GPS receivers, and estimate the achievable accuracies, and focus on topics which are more unique to radio navigation or GPS.
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Digital and analog communication systems
TL;DR: This book provides a broad introduction to basic analog and digital principles and their application to the design and analysis of real- world communication systems and provides readers with a working knowledge of how to use both classical mathematical and personal computer methods to analyze, design, and simulate modern communication systems.
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Global positioning system
TL;DR: In this paper, a method and apparatus for providing duplex copies in pre-collated output copy sets from a set of documents recirculated in order by first copying only the even-ordered documents in the set once onto the first sides of substrates and transporting those copies to a buffer, and then making individual copies in order of all the documents by alternately copying odd order documents on the reverse side of copies fed from the buffer while alternately copy even ordered documents onto copy substrates fed from a different copy substrate source, and transporting the copies made from a buffer to an
Robust Signal Quality Monitoring and Detection of Evil Waveforms
TL;DR: This report evaluates the best current evil waveform (EWF) signal quality monitoring configuration, SQM2b, using the “secondorder step” threat model and compares the maximum regional pseudorange errors (PRE’s), computed at varying elevation angles, to the maximum allowable pseudorange (MERR) errors.