Estimation and Analysis of Protection Levels for Precise Approach at Rio De Janeiro International Airport Using Real Time Σvig for Each GPS and Glonass Satellite

Pereira, Vinícius Amadeu Stuani; Monico, J. F. Galera; Camargo, Paulo de Oliveira

doi:10.1590/s1982-21702021000s00010

Cited by 6 publications

(8 citation statements)

References 20 publications

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“…The dispersion (standard deviations) of such differences also could precisely indicate the expected quality for resulting ionospheric observables. The gradients are computed as detailed in (Pereira et al 2021) using the time steep procedure.…”

Section: Methodsmentioning

confidence: 99%

Assessment of Stec Estimation Quality Using GNSS PPP Fixed

Monico,

de Oliveira Jr.,

Pereira

et al. 2023

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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Abstract. GNSS (Global Navigation Satellite System) data can be used for geodetic remote sensing, particularly for monitoring the ionosphere in the context of Space Weather. One of the important parameters derived from GNSS measurements for ionospheric analysis is the Slant Total Electron Content (STEC). By utilizing GNSS data from multiple frequencies or even a single frequency, the STEC can be computed using an appropriated linear combination, like geometry free. However, when computing an ionospheric gradient between two IPP (Ionospheric Pierce Point) from the same satellite, the precision of the STEC estimate can become a limiting factor. In some cases, the uncertainty in the estimate may be greater than the actual gradient value itself. This poses challenges, especially for augmentation systems like GBAS (Ground Based Augmentation System), where accurate ionospheric gradients are crucial. An alternative approach to improve these limitations is to estimate the STEC using a different approach, like Precise Point Positioning (PPP). For such case, the coordinates of the GNSS stations are constrained to known values (PPP-Fixed), while other parameters such as clock biases, tropospheric delays, and ionospheric delays (including STEC) can be estimated. The results of an experiment carried out to assess the quality of STEC for such application are presented and have shown good results. Ionospheric gradients are agreed in the mm level.

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Section: Methodsmentioning

confidence: 99%

Assessment of Stec Estimation Quality Using GNSS PPP Fixed

Monico,

de Oliveira Jr.,

Pereira

et al. 2023

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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“…Therefore, the HPL describes the confirmed region based on probability as containing the indicated horizontal position. Assuming that the horizontal position errors have Gaussian distribution, the HPL can be calculated considering a fault-free missed detection, which corresponds to a probability (PEREIRA et al 2021). In this work, a simplified HPL was considered based only on the mean value of the positional error, represented by a circle, and the radius of PL value was obtained using the following equation:…”

Section: Methodsmentioning

confidence: 99%

A new method for evaluation of the positional error of low-cost devices based on GNSS integrity for transportation applications

et al. 2022

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GNSS integrity assessment has always been linked to the need for reliable positional information. Initially used in aviation, positional information gained even more relevance in terrestrial applications with the popularity of GNSS. However, the terrestrial environment has many influences over GNSS signals, which reduces the positional quality of tracking objects. Advances have been achieved in the use of integrity monitoring algorithms, but there are limitations to their use, especially those concerning positional accuracy in urban environments with low-cost devices. This paper aims to discuss a comparative method using two low-cost GNSS receivers designed for transportation applications and to verify whether this method can evaluate positional quality in pre-established locations, as well as the possibilities of using these devices for transportation applications, considering the positional error. Results show that, in the static experiment, the receiver assembled with a GPS antenna active embedded was more accurate than the receiver assembled with an external antenna, presenting better values in 5 out of 10 evaluated sites, while the external antenna performed better in only 2 sites. However, in a kinematic evaluation, the receiver assembled with an external antenna provided better results when considering positional error as assessment criterion, resulting in values less than or equal to 8 meters in 99.7% of the route evaluated, while the embedded antenna had 95.3%.

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“…Another contribution to this topic was the work by Marini- Pereira et al (2021b), which evaluated the effectiveness of the use of Satellite-Based Augmentation Systems (SBAS) in the Brazilian territory. Ionospheric error bounds of Grid Ionospheric Vertical Error (GIVE) were generated and presented as maps, considering the geophysical environment.…”

Section: Effects Of the Low-latitude Ionosphere On Augmentation Syste...mentioning

confidence: 99%

“…Thus, to verify the usability of GBAS in Brazil, 17 RBMC/IBGE stations available within a radius of 500 km from SBGL airport, were selected to estimate the parameters of the corresponding CONUS model for the autumn period (the season most affected by EPBs). In this study, Pereira et al (2021b) used data from 63 days between the years 2000 and 2016 (maximum activities of solar cycles 23 and 24), and a maximum distance of 250 km to form station pairs. Such estimates considered only GPS L1 and L2 carrier-phase measurements and a 10° elevation mask.…”

Section: Development Of An Ionospheric Threat Model For Gbas Operatio...mentioning

confidence: 99%

The GNSS NavAer INCT Project Overview and Main Results

Monico

Paula

Moraes

et al. 2022

J. Aerosp. Technol. Manag.

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Air navigation is increasingly dependent on the use of Global Navigation Satellite Systems (GNSS). It allows the determination of the aircraft's position in all phases of the flight and brings many advantages. Although GNSS navigation results in gains, the radio signals from these systems are strongly influenced by the ionospheric environment. It introduces errors that can affect the accuracy, integrity, availability and continuity requirements established by the International Civil Aviation Organization (ICAO). The ionospheric layer has different behaviors depending on the latitude, time of day, season of the year, geomagnetic activity and solar cycle. Since Brazil is located in a region of low latitudes, it experiences a series of unique challenges when compared to regions of mid-latitudes. For this reason, the application of GNSS-based technologies in aviation over the Brazilian territory requires an in-depth assessment of the ionosphere effects. Therefore, the Instituto Nacional de Ciência e Tecnologia (INCT) named GNSS Technology for Supporting Air Navigation was formed in 2017 to better assess the ionosphere impacts and assist government agencies and companies in the development of safe air navigation procedures over Brazil in a near future. This paper presents the most relevant advances achieved so far within this multidisciplinary project that involves Brazilian research centers and universities.

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Estimation and Analysis of Protection Levels for Precise Approach at Rio De Janeiro International Airport Using Real Time Σvig for Each GPS and Glonass Satellite

Cited by 6 publications

References 20 publications

Assessment of Stec Estimation Quality Using GNSS PPP Fixed

Assessment of Stec Estimation Quality Using GNSS PPP Fixed

A new method for evaluation of the positional error of low-cost devices based on GNSS integrity for transportation applications

The GNSS NavAer INCT Project Overview and Main Results

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