Fault-Free Integrity Analysis of Mega-Constellation-Augmented GNSS

Racelis, Danielle; Pervan, Boris; Joerger, Mathieu

doi:10.33012/2019.16862

Cited by 15 publications

(3 citation statements)

References 17 publications

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“…Authors in the paper [44] propose a building update monitoring algorithm based on sky visibility estimation using GNSS and LEO satellites. In addition, the potential of megaconstellation-augmented GNSS for fault-free high-integrity positioning in both open-sky and urban areas of Tucson, Arizona is evaluated in the article [45].…”

Section: B Proposed Approaches/models For Gnss Performance In Urban C...mentioning

confidence: 99%

Comparing Positioning Performance of LEO Mega-Constellations and GNSS in Urban Canyons

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Cianca,

De Sanctis

2024

IEEE Access

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The use of Low Earth Orbit (LEO) mega-constellations for Positioning, Navigation, and Timing (PNT) services has attracted a great deal of interest, as they could complement the Global Navigation Satellite System (GNSS) in specific conditions/environments. Despite the fact that it is recognized that the use of mega-constellations for positioning services could provide better performance in urban canyons, no work has provided an analysis of such performance improvement. This paper provides a statistical analysis of the performance in terms of availability and Geometric Dilution of Precision (GDOP) of the positioning service of some current mega-constellations in deep urban canyon environments and compares the performance with the one achieved by GNSS systems. A new geometric model for typical urban canyons is developed. The developed model has been used for the analysis of the availability and GDOP of the positioning service in two representative urban canyon areas, namely the city of London and the Manhattan district of New York City. The geometric parameters used in the simulations are derived by statistically processing publicly available data on the height and length of the buildings and the width of the streets in the considered urban areas.

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Section: B Proposed Approaches/models For Gnss Performance In Urban C...mentioning

confidence: 99%

Comparing Positioning Performance of LEO Mega-Constellations and GNSS in Urban Canyons

More,

Cianca,

De Sanctis

2024

IEEE Access

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“…The disadvantage of SOPs is that the signals are not optimized for navigational purposes. This means that the signal structure may not be fully known, signals from different transmitters (even from the same system) are not synchronized in time, their clock stability is lower than that of GNSS satellites, and the transmitter positions are unknown [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Doppler Positioning of Dynamic Targets with Unknown LEO Satellite Signals

Yang

Zang

et al. 2023

Electronics

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A new concept of global navigation based on Doppler measurements from a large low Earth orbit (LEO) constellation is investigated that has potential to serve as a complement or backup to global navigation satellite systems (GNSSs) to provide navigation and positioning services in GNSS denial environments. In this work, we investigate the potential of LEO communication satellite opportunity signals in dynamic navigation, establish LEO satellite Doppler positioning equations, derive the main error sources affecting the Doppler positioning results of a dynamic target, and analyze the impact of each error source on positioning accuracy through a simulation. The results show that the orbit error and clock drift had a large impact on positioning accuracy. This navigation scheme would be more competitive if it could provide high-precision satellite orbits and accurate Doppler measurements. The obtained results show that the LEO satellite signals used as navigation opportunity signals are an attractive alternative in GNSS rejection environments for high dynamic targets.

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“…Other researchers have considered the possibility of using large LEO constellations for navigation, [e.g., (Benzerrouk & Fang et al., 2019; Benzerrouk & Nguyen et al., 2019; Gutt et al., 2018; Iannucci & Humphreys, 2020; Kassas et al., 2019; Khalife & Kassas, 2019a; Khalife & Kassas, 2019b; Morales et al., 2019; Morales‐Ferre et al., 2020; Racelis et al., 2019; and Reid et al., 2018)]. Some studies have considered carrier Doppler shift or beat carrier phase, which is the negative time integral of Doppler shift.…”

Section: Introductionmentioning

confidence: 99%

Navigation using carrier Doppler shift from a LEO constellation: TRANSIT on steroids

Psiaki

2021

Navigation

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A new global navigation concept is studied that relies on carrier Doppler shift measurements from a large LEO constellation. This system could provide an alternative to pseudorange‐based GNSS. The concept uses a high‐fidelity model of received carrier Doppler shift. This model is used in a point‐solution batch filter that simultaneously estimates eight unknowns: the three position vector components, receiver clock offset, three velocity vector components, and receiver clock offset rate. The filter uses eight or more measured Doppler shifts in its least‐squares fit. A generalized Geometric Dilution of Precision (GDOP) analysis indicates that absolute position accuracies on the order of 1‐5 meters and absolute velocity accuracies on the order of 0.01 m/sec to 0.05 m/sec may be achievable if the range‐rate precision of the Doppler shift measurements is 0.01 m/sec. These accuracies are comparable to current pseudorange‐based GNSS. Clock offset accuracy is on the order of 0.0001 to 0.0010 sec 1‐σ.

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Fault-Free Integrity Analysis of Mega-Constellation-Augmented GNSS

Cited by 15 publications

References 17 publications

Comparing Positioning Performance of LEO Mega-Constellations and GNSS in Urban Canyons

Comparing Positioning Performance of LEO Mega-Constellations and GNSS in Urban Canyons

Doppler Positioning of Dynamic Targets with Unknown LEO Satellite Signals

Navigation using carrier Doppler shift from a LEO constellation: TRANSIT on steroids

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