Integrity Based on MT28 for EGNOS: New Algorithm Formulation &amp; Results

Authié, Thierry; Trilles, Sébastien; Fort, Jean‐Claude; Azaı̈s, Jean-Marc

doi:10.33012/2017.15143

Cited by 3 publications

(2 citation statements)

References 1 publication

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“…Interest in the covariance of real-time precise GPS orbits, as well as in the accuracy, has increased in the context of user integrity, navigation performance improvement, and fault detection [10][11][12][13]. In terms of safety, covariance is one of the most important factors that provide integrity that ensures correct position information.…”

Section: Introductionmentioning

confidence: 99%

“…The accuracy of SISRE is calculated with proper weightings for radial, along-track, and cross-track standard deviations [16,17]. Providing full covariance enables each user to propagate the accuracy of SISRE by projecting the error ellipsoid along its line of sight [11], which can reduce specific accuracy of SISRE according to the various positions of the users [12]. Therefore, to generate appropriate accuracy of SISRE, proper error ellipsoid which contains the true orbit should be obtained.…”

Section: Introductionmentioning

confidence: 99%

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Covariance Analysis of Real-Time Precise GPS Orbit Estimated from Double-Differenced Carrier Phase Observations

Kim

Song

et al. 2019

Remote Sensing

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The covariance of real-time global positioning system (GPS) orbits has been drawing attention in various fields such as user integrity, navigation performance improvement, and fault detection. The international global navigation satellite system (GNSS) service (IGS) provides real-time orbit standard deviations without correlations between the axes. However, without correlation information, the provided covariance cannot assure the performance of the orbit product, which would, in turn, causes significant problems in fault detection and user integrity. Therefore, we studied real-time GPS orbit covariance characteristics along various coordinates to effectively provide conservative covariance. To this end, the covariance and precise orbits are estimated by means of an extended Kalman filter using double-differenced carrier phase observations of 61 IGS reference stations. Furthermore, we propose a new method for providing covariance to minimize loss of correlation. The method adopted by the IGS, which neglects correlation, requires 4.5 times the size of the covariance to bind orbit errors. By comparison, our proposed method reduces this size from 4.5 to 1.3 using only one additional parameter. In conclusion, the proposed method effectively provides covariance to users.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Covariance Analysis of Real-Time Precise GPS Orbit Estimated from Double-Differenced Carrier Phase Observations

Kim

Song

et al. 2019

Remote Sensing

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Performance analysis of SBAS ephemeris corrections and integrity algorithms in China region

Jin

Chen

et al. 2021

Satell Navig

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Satellite Based Augmentation Systems (SBASs) improve the positioning accuracy and integrity by broadcasting to the civil aviation community the corrections and integrity parameters. A snapshot algorithm based on the minimum variance estimation is investigated in this study to calculate the satellite clock and orbit corrections. A chi-square test is performed on the remaining errors in the corrected ephemeris to guarantee the integrity. User Differential Range Error (UDRE) and scaling matrix contained in Message Type 28 are derived using the covariance information based on the assumption that one of the reference stations failed. A software package is developed and applied in the real data collected at 26 stations. International GNSS (Global Navigation Satellite System) Service (IGS) precise clock and orbit products are taken as the references to assess the accuracy of corrections. For both Global Positioning System (GPS) and BeiDou Navigation Satellite System (BDS), the range accuracy of 0.10 m can be achieved with the employment of the derived corrections. No obvious performance difference between GPS and BDS is found. UDREs for all visible satellites are generated with the maximum index of 12 and minimum index of 3. The geometric range differences calculated with IGS precise products and broadcast ephemeris are employed to assess the integrity of UDRE. It is found that the UDRE is able to bound the residuals with 99.9% confidence which meet the requirement of aviation users. With ionospheric delay corrected by Global Ionosphere Map (GIM), the positioning accuracy of 0.98 m with GPS corrections and 0.80 m with multi-constellation augmentation can be achieved which indicates a significant improvement of GPS standalone results.

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Integrity-Bounds Computation for SBAS Multi-Domain Users

Rodriguez-Veiga,

Montloin

2023

Proceedings of the 36th International Technical Meeting of the Satellite Division of the Institute of Navigation (ION GNSS+ 202

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Integrity Based on MT28 for EGNOS: New Algorithm Formulation & Results

Abstract: His main topics of research are the stochastic algorithms and more recently the sensitivity analysis of large systems.

Cited by 3 publications

References 1 publication

Covariance Analysis of Real-Time Precise GPS Orbit Estimated from Double-Differenced Carrier Phase Observations

Covariance Analysis of Real-Time Precise GPS Orbit Estimated from Double-Differenced Carrier Phase Observations

Performance analysis of SBAS ephemeris corrections and integrity algorithms in China region

Integrity-Bounds Computation for SBAS Multi-Domain Users

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