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  • Feasibility analysis of a methodology to estimate hourly DCBs for Feared Events Characterization

     Juan Zornoza, Jose Miguel; Sanz Subirana, Jaime
    Date: 2014-05-19
    Report

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    Analysis of Hardware Biases Feared Events

    Analysis of Hardware Biases Feared Events

  • Development of a GBAS ground station prototype: algorithms update

     Sanz Subirana, Jaime; Gonzalez Casado, Guillermo; Juan Zornoza, Jose Miguel
    Date: 2014-01-07
    Report

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  • Establishment of Sigma_pr_gnd

     Sanz Subirana, Jaime; Juan Zornoza, Jose Miguel
    Date: 2014-01-20
    Report

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  • Ionospheric conditions and associated scenarios for EGNOS ACTIVITY selected from the last Solar Cycle (ICASES-2)

     Sanz Subirana, Jaime; Juan Zornoza, Jose Miguel
    Participation in a competitive project

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  • GNSS Data Processing, Vol 2: Laboratory exercises , (ESA TM-23/2, May 2013)

     Sanz Subirana, Jaime; Juan Zornoza, Jose Miguel; Hernandez Pajares, Manuel
    Date of publication: 2013-05-01
    Book

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    This two-volume book contains a self-learning course and software tools aimed at providing the necessary background to start work in an operative way in GNSS navigation. The books are focused on the instrumental use of concepts and techniques involved in GNSS navigation and include all the elements needed to understand how the system works and how to work with it. After working through the two volumes, students should be able to develop their own tools for high-accuracy navigation, implementing the algorithms and expanding the skills learned. The first volume is devoted to theory, providing a summary of GNSS fundamentals and algorithms. The second volume is devoted to laboratory exercises, with a wide range of selected practical examples going further into the theoretical concepts and their practical implementation. The exercises have been developed with a specialised software package (the ESA/U PC gLAB educational SW, on an attached CD) and selected data files are provided for the laboratory sessions.

  • GNSS Data Processing, Vol1: Fundamentals and Algorithms, (ESA TM-23/1, May 2013)

     Sanz Subirana, Jaime; Juan Zornoza, Jose Miguel; Hernandez Pajares, Manuel
    Date of publication: 2013-05-01
    Book

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    This two-volume book contains a self-learning course and software tools aimed at providing the necessary background to start work in an operative way in GNSS navigation. The books are focused on the instrumental use of concepts and techniques involved in GNSS navigation and include all the elements needed to understand how the system works and how to work with it. After working through the two volumes, students should be able to develop their own tools for high-accuracy navigation, implementing the algorithms and expanding the skills learned. The first volume is devoted to theory, providing a summary of GNSS fundamentals and algorithms. The second volume is devoted to laboratory exercises, with a wide range of selected practical examples going further into the theoretical concepts and their practical implementation. The exercises have been developed with a specialised software package (the ESA/U PC gLAB educational SW, on an attached CD) and selected data files are provided for the laboratory sessions. This is an end-to-end GNSS course addressed to all professionals and students who wish to undertake a deeper study of satellite navigation, targeting the GNSS data processing and analysis issues.

  • ICASES scenarios Final Report

     Juan Zornoza, Jose Miguel; Sanz Subirana, Jaime
    Date: 2013-12-11
    Report

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  • Description of the experiment set-up in Vietnam

     Quang, Phuong Xuan; Vinh, La The; Juan Zornoza, Jose Miguel; Sanz Subirana, Jaime; Garcia Rigo, Alberto; Hai Tung, Ta
    Date: 2013-07-03
    Report

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  • Development of a GBAS ground station prototype: algorithms

     Sanz Subirana, Jaime; Juan Zornoza, Jose Miguel
    Date: 2013-08-15
    Report

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  • IONI-R and IONA-R scenarios report

     Juan Zornoza, Jose Miguel; Sanz Subirana, Jaime
    Date: 2013-04-26
    Report

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  • Determination of Monitor Thresholds

     Sanz Subirana, Jaime; Juan Zornoza, Jose Miguel
    Date: 2013-10-31
    Report

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  • Two-component model of topside ionosphere electron density profiles retrieved from GNSS radio occultations

     Gonzalez Casado, Guillermo; Juan Zornoza, Jose Miguel; Hernandez Pajares, Manuel; Sanz Subirana, Jaime
    Journal of geophysical research
    Date of publication: 2013
    Journal article

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    A simple model for the topside ionosphere region is introduced and applied to fit radio-occultation retrieved electron density profiles for altitudes above the F2-peak. The model considers two isothermal components representing the population of the O+ (ionosphere component) and the H+ (protonosphere component) ions. The purpose of the model is to achieve an accurate fit of the observed profiles in the topside ionosphere region while, at the same time, allowing a direct and simple derivation of two important ionospheric parameters, namely, the O+ vertical scale height and the upper transition height. Covering a time period of one year, the fits with the two-component model function are compared with those achieved with one-component functions commonly used in the literature and it is shown that the former provides significantly better fits than the later, with more than a factor of two improvement. The model predictions concerning: the correlation between the O+ vertical scale height and the upper transition height, the altitude dependence of the vertical scale height of the electron density, and the quantitative contribution of the protonosphere to the total electron content are examined and shown to be consistent with the observations and with previous studies. It is concluded that the model provides a realistic description of the vertical distribution of the two main ion constituents of the topside ionosphere.

  • Feasibility of a linear model of the ionospheric scale height based on LEO GNSS occultation data

     Olivares Pulido, German; Hernandez Pajares, Manuel; Aragon Angel, Maria Angeles; Sanz Subirana, Jaime
    European Geosciences Union General Assembly
    Presentation's date: 2013-05
    Presentation of work at congresses

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  • New indicator for definition of ionospheric operational conditions

     Juan Zornoza, Jose Miguel; Sanz Subirana, Jaime; Hernandez Pajares, Manuel; Prieto Cerdeira, Roberto; Schlueter, Stefan
    SBAS-IONO
    Presentation's date: 2013-07-12
    Presentation of work at congresses

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    Impact of higher order ionospheric delay on precise GNSS computation  Open access

     Hernandez Pajares, Manuel; Aragon Angel, Maria Angeles; Defraigne, Pascale; Bergeot, Nicolas; Prieto Cerdeira, Roberto; Sanz Subirana, Jaime
    International Colloquium Scientific and Fundamental Aspects of the Galileo Programme
    Presentation's date: 2013-12
    Presentation of work at congresses

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  • Solar EUV flux rate estimation during mid and strong flares from the ionospheric electron content response signature in GNSS observations

     Hernandez Pajares, Manuel; Garcia Rigo, Alberto; Juan Zornoza, Jose Miguel; Sanz Subirana, Jaime; Monte Moreno, Enrique; Aragon Angel, Maria Angeles
    European Conference on Antennas and Propagation
    Presentation's date: 2013-04-08
    Presentation of work at congresses

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    A simple and precise technique to measure the sudden Extreme Ultraviolet (EUV) radiation increase of the Sun, during mid and strong flares, has been formulated and demonstrated for the most active part of the last Solar Cycle. On the one hand, it is based on the short time scale of these events, which allows the validity of a simple global overionization model. And on the other hand on the prompt ionospheric response to the EUV ionization, which signature (in terms of the Global Navigation Satellite Systems -GNSSSolar Flare Activity Indicator, GSFLAI) is accurately measured in real-time from the existing global networks of dual-frequency GNSS receivers, and with a time resolution higher that those of dedicated space probes. Moreover the sensitivity of this approach enables the detection of not only extreme X-class flares, but also the detection of variations of one order of magnitude lower or even smaller (such as for M-class flares): 100% successful detection for all the X-class solar flares during 2000-2006 with registered location outside of the solar limb (i.e. detection of 94% of all of X-class solar-flares) and about 65% for M-class ones, obtained with the associated SISTED detector. In summary, its full availability, continuity, high precision and integrity for mid and high solar flare effects on Ionosphere, can make GSFLAI an useful indicator of potential Space Weather activity for many users in radio propagation. These results, which have been recently published by the authors, are extended in this work up to one complete solar cycle, and using a lower sampling rate (30 seconds), demonstrating the better behaviour of this indirect solar EUV variability proxy (GSFLAI30), when comparisons are made with direct measurements from space probes, providing readings which can be affected by the late enhancement of particles.

    A simple and precise technique to measure the sudden Extreme Ultraviolet (EUV) radiation increase of the Sun, during mid and strong flares, has been formulated and demonstrated for the most active part of the last Solar Cycle. On the one hand, it is based on the short time scale of these events, which allows the validity of a simple global overionization model. And on the other hand on the prompt ionospheric response to the EUV ionization, which signature (in terms of the Global Navigation Satellite Systems -GNSSSolar Flare Activity Indicator, GSFLAI) is accurately measured in real-time from the existing global networks of dual-frequency GNSS receivers, and with a time resolution higher that those of dedicated space probes. Moreover the sensitivity of this approach enables the detection of not only extreme X-class flares, but also the detection of variations of one order of magnitude lower or even smaller (such as for M-class flares): 100% successful detection for all the X-class solar flares during 2000-2006 with registered location outside of the solar limb (i.e. detection of 94% of all of X-class solar-flares) and about 65% for M-class ones, obtained with the associated SISTED detector. In summary, its full availability, continuity, high precision and integrity for mid and high solar flare effects on Ionosphere, can make GSFLAI an useful indicator of potential Space Weather activity for many users in radio propagation. These results, which have been recently published by the authors, are extended in this work up to one complete solar cycle, and using a lower sampling rate (30 seconds), demonstrating the better behaviour of this indirect solar EUV variability proxy (GSFLAI30), when comparisons are made with direct measurements from space probes, providing readings which can be affected by the late enhancement of particles.

  • Ionospheric perturbations analysis in the South East Asia Region

     Garcia Rigo, Alberto; Juan Zornoza, Jose Miguel; Sanz Subirana, Jaime; Hernandez Pajares, Manuel
    International Reference Ionosphere (IRI) Workshop
    Presentation's date: 2013-06-25
    Presentation of work at congresses

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  • Ionospheric activity in the South East Asian region

     Juan Zornoza, Jose Miguel; Sanz Subirana, Jaime; Prieto Cerdeira, Roberto; Schlueter, Stefan
    International Conference on Space, Aeronautical and Navigational Electronics
    Presentation's date: 2013-12-03
    Presentation of work at congresses

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    A SBAS Ionospheric Activity indicator, based in the RMS of Along Arc TEC Rate (AATR) computations has been defined by the gAGE/UPC authors in the context of previous studies on EGNOS Ionosphere. This indicator can be easily computed from GNSS data and, unlike other global indices which are related with the geomagnetic activity, it is sensible to the regional behaviour of the ionosphere. After a deep assessment done over Europe and Africa during the last Solar Cycle, this AATR indicator has been chosen as the metric to characterise the ionospheric operational conditions in the frame of ESA EGNOS activities (EGNOS V3 Mission Requirements). In this work we summarise the results of the application of the AATR indicator to the analysis of the ionospheric activity during an entire Solar Cycle in the South of Asia (SEA) Region. This region has special interest from the ionospheric point of view, because the larger Slant Total Electron Content (STEC) values and gradients experienced due to its proximity to the ionospheric equatorial anomaly.

    A SBAS Ionospheric Activity indicator, based in the RMS of Along Arc TEC Rate (AATR) computations has been defined by the gAGE/UPC authors in the context of previous studies on EGNOS Ionosphere. This indicator can be easily computed from GNSS data and, unlike other global indices which are related with the geomagnetic activity, it is sensible to the regional behaviour of the ionosphere. After a deep assessment done over Europe and Africa during the last Solar Cycle, this AATR indicator has been chosen as the metric to characterise the ionospheric operational conditions in the frame of ESA EGNOS activities (EGNOS V3 Mission Requirements). In this work we summarise the results of the application of the AATR indicator to the analysis of the ionospheric activity during an entire Solar Cycle in the South of Asia (SEA) Region. This region has special interest from the ionospheric point of view, because the larger Slant Total Electron Content (STEC) values and gradients experienced due to its proximity to the ionospheric equatorial anomaly.

  • Outline on gAGE/UPC on-going activities in GNSS monitoring of ionosphere

     Garcia Rigo, Alberto; Hernandez Pajares, Manuel; Juan Zornoza, Jose Miguel; Sanz Subirana, Jaime
    International Reference Ionosphere (IRI) Workshop
    Presentation's date: 2013-06-25
    Presentation of work at congresses

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  • Higher order ionospheric delay effects and mitigation in GNSS signals for high precision applications

     Hernandez Pajares, Manuel; Aragon Angel, Maria Angeles; Defraigne, Pascale; Bergeot, Nicolas; Prieto Cerdeira, Roberto; Sanz Subirana, Jaime; Garcia Rigo, Alberto
    International Beacon Satellite Symposium
    Presentation's date: 2013-07
    Presentation of work at congresses

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    The significance of higher order ionospheric terms (I2+) and the performance of realistic mitigation strategies are analyzed. After confirming the unfeasibility of removing second order ionospheric term (I2) with combinations of actual data of three - frequency measurements (in coincidence with the theoretical expectations), we focus on the I2+ correction modelling from electron density and geomagnetic models, and empirical bending approximations. Using realistic simulated GNSS global observations with actual geometry (by using the IRI2012 and IGRFv11 for electron density and geomagnetic field), the impact of I2+ on high precision GNSS processing has been quantified by using independently the GIPSY and BERNESE software which provides equivalent results. The main general conclusion is that the modeling of I2+ (mainly in terms of I2, the predominant term at all the elevations, and bending corrections) can mitigate most of I2+ signature in GNSS precise geodetic products (receiver position, clock and zenith non - hydrostatic delays, satellite orbits and clocks, and geocenter estimate), which, otherwise can be significant from mm to cm level during solar cycle maximum conditions. A similar conclusion can be extended consistently to Precise Point Positioning (PPP) processing.

  • Definition of an SBAS ionospheric activity indicator and its assessment over Europe and Africa During the last solar cycle

     Sanz Subirana, Jaime; Juan Zornoza, Jose Miguel; Hernandez Pajares, Manuel; Prieto Cerdeira, Roberto; Schlueter, Stefan
    International Beacon Satellite Symposium
    Presentation's date: 2013-07
    Presentation of work at congresses

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    In this work, an ionospheric activity indicator is defined based in the ¿weighted¿ Along Arc TEC rate (AATR). It is shown that this indicator, which can be easily computed from the GPS carrier phases, is well correlated with the ionospheric activity and, unlike other global indicators linked to the geomagnetic activity, can be sensitive to regional behaviours of ionospheric activity

    In this work, an ionospheric activity indicator is defined based in the “weighted” Along Arc TEC rate (AATR). It is shown that this indicator, which can be easily computed from the GPS carrier phases, is well correlated with the ionospheric activity and, unlike other global indicators linked to the geomagnetic activity, can be sensitive to regional behaviours of ionospheric activity

  • Characterization and modelling of the ionosphere for EGNOS development and qualification

     Schlüter, S.; Prieto Cerdeira, Roberto; Orús Pérez, Raul; Lam, J.P.; Juan Zornoza, Jose Miguel; Sanz Subirana, Jaime; Hernandez Pajares, Manuel
    The European Navigation Conference
    Presentation's date: 2013-04-23
    Presentation of work at congresses

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    The availability of representative data samples, models and statistical information derived from the analysis of parameters that adequately describe the state of the ionosphere are key elements for the design, verification and qualification of EGNOS algorithms. As part of the on-going evolutions of EGNOS V2 releases, and also in support to the development of a future multi-constellation and dual-frequency SBAS (EGNOS V3), ESA has started a refinement process of the tools, data and precise definition of the ionospheric operational conditions. A particular driver for this process is the improvement of the availability performance of the current and future system especially under solar max and severe ionospheric conditions, without degradation of integrity and accuracy performances. The paper provides an overview about the concept and the data and models used for EGNOS development and qualification. It outlines the approaches to generate reference models and describes the parameter used for the characterization of nominal and perturbed ionospheric conditions from an SBAS perspective.

    The availability of representative data samples, models and statistical information derived from the analysis of parameters that adequately describe the state of the ionosphere are key elements for the design, verification and qualification of EGNOS algorithms. As part of the on-going evolutions of EGNOS V2 releases, and also in support to the development of a future multi-constellation and dual-frequency SBAS (EGNOS V3), ESA has started a refinement process of the tools, data and precise definition of the ionospheric operational conditions. A particular driver for this process is the improvement of the availability performance of the current and future system especially under solar max and severe ionospheric conditions, without degradation of integrity and accuracy performances. The paper provides an overview about the concept and the data and models used for EGNOS development and qualification. It outlines the approaches to generate reference models and describes the parameter used for the characterization of nominal and perturbed ionospheric conditions from an SBAS perspective.

  • Propagation of medium scale traveling ionospheric disturbances at different latitudes and solar cycle conditions

     Hernandez Pajares, Manuel; Juan Zornoza, Jose Miguel; Sanz Subirana, Jaime; Aragon Angel, Maria Angeles
    Radio science
    Date of publication: 2012
    Journal article

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  • Access to the full text
    Wide Area RTK: a satellite navigation system based on precise real-time ionospheric modelling  Open access

     Juan Zornoza, Jose Miguel; Sanz Subirana, Jaime; Hernandez Pajares, Manuel; Samson, Jaron; Tossaint, Michel Mathias Maria; Aragon Angel, Maria Angeles; Salazar Hernández, Dagoberto José
    Radio science
    Date of publication: 2012-04-19
    Journal article

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    The Wide Area Real Time Kinematic (WARTK) is an augmentation system concept for multi-frequency users based on precise real-time ionospheric modeling. It is able to provide a high accuracy and integrity GNSS positioning service over continental areas using the infrastructure of a network of permanent ground monitor stations, such as the European Geostationary Navigation Overlay Service (EGNOS) network of Ranging and Integrity Monitoring Stations (RIMS) in Europe. In this way, it allows an additional benefit to be obtained from these reference stations, that is, the network has the potential to support two independent systems: a satellite-based augmentation system, such as EGNOS, and a high-precision positioning service, based on WARTK. Indeed, thanks to the accuracy of the ionospheric corrections provided, WARTK users have available in real-time an extra constraint per satellite between the carrier phase ambiguities, which helps solve them quickly. Once such ambiguities have been solved, the GNSS user obtains navigation accurate to within 20 cm at the 95th percentile (about 10 cm RMS). Moreover, this precise positioning is achieved in a few minutes (with two frequency signals) or in a single epoch, after initial convergence of the tropospheric delay (with three frequency signals), even up to hundreds of kilometers away from the nearest reference station. While previous WARTK research has been devoted to implementing the concept and assessing its feasibility, considering in particular the accuracy achievable, the work reported in this paper focused on consolidating the results by analyzing a large and representative data set, and on deeper analysis of the integrity issue. It was carried out in the context of the Multi-constellation Regional System (MRS) project, within the European Space Agency GNSS Evolution Programme, with the aim of designing a high accuracy service for GPS and/or Galileo. Three months of actual data, from more than 25 permanent GPS stations in Europe, have been processed (some of them as a roving user), for high-, mid- and low-solar cycle conditions (in 2002, 2004 and 2006 respectively). In addition, several ionospheric storms occurred during the selected periods, with Dst values reaching up to −150 nT. Results based on these data show that user domain integrity was maintained for baselines of up to 400 km. At the 95th percentile, the daily horizontal and vertical position errors were 20 and 30 cm, respectively, and the corresponding protection levels were about 1 and 2 m. The convergence time was around 5 minutes with actual GPS constellation data. The benefits of using a multi-constellation system were also studied, with simulated GPS and three-frequency Galileo data, showing that it is possible to reduce the convergence time to a few seconds.

  • GNSS measurement of EUV photons flux rate during strong and mid solar flares

     Hernandez Pajares, Manuel; Garcia Rigo, Alberto; Juan Zornoza, Jose Miguel; Sanz Subirana, Jaime; Monte Moreno, Enrique; Aragon Angel, Maria Angeles
    Space weather: the international journal of research and applications
    Date of publication: 2012-12-12
    Journal article

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    Integrity monitoring for carrier phase ambiguities  Open access

     Feng, Shaojun; Ochieng, Washington; Samson, Jaron; Tossaint, Michel Mathias Maria; Hernandez Pajares, Manuel; Juan Zornoza, Jose Miguel; Sanz Subirana, Jaime; Aragon Angel, Maria Angeles; Ramos Bosch, Pedro; Jofre, Martí
    Journal of navigation
    Date of publication: 2012-01
    Journal article

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    The determination of the correct integer number of carrier cycles (integer ambiguity) is the key to high accuracy positioning with carrier phase measurements from Global Navigation Satellite Systems (GNSS). There are a number of current methods for resolving ambiguities including the Least-squares AMBiguity Decorrelation Adjustment (LAMBDA) method, which is a combination of least-squares and a transformation to reduce the search space. The current techniques to determine the level of confidence (integrity) of the resolved ambiguities (i.e. ambiguity validation), usually involve the construction of test statistics, characterisation of their distribution and definition of thresholds. Example tests applied include ratio, F-distribution, t-distribution and Chi-square distribution. However, the assumptions that underpin these tests have weaknesses. These include the application of a fixed threshold for all scenarios, and therefore, not always able to provide an acceptable integrity level in the computed ambiguities. A relatively recent technique referred to as Integer Aperture (IA) based on the ratio test with a large number of simulated samples of float ambiguities requires significant computational resources. This precludes the application of IA in real time. This paper proposes and demonstrates the power of an integrity monitoring technique that is applied at the ambiguity resolution and positioning stages. The technique has the important benefit of facilitating early detection of any potential threat to the position solution, originating in the ambiguity space, while at the same time giving overall protection in the position domain based on the required navigation performance. The proposed method uses the conventional test statistic for ratio testing together with a doubly non-central F distribution to compute the level of confidence (integrity) of the ambiguities. Specifically, this is determined as a function of geometry and the ambiguity residuals from least squares based ambiguity resolution algorithms including LAMBDA. A numerical method is implemented to compute the level of confidence in real time. The results for Precise Point Positioning (PPP) with simulated and real data demonstrate the power and efficiency of the proposed method in monitoring both the integrity of the ambiguity computation and position solution processes. Furthermore, due to the fact that the method only requires information from least squares based ambiguity resolution algorithms, it is easily transferable to conventional Real Time Kinematic (RTK) positioning.

  • Enhanced precise point positioning for GNSS users

     Juan Zornoza, Jose Miguel; Hernandez Pajares, Manuel; Sanz Subirana, Jaime; Ramos Bosch, Pedro; Aragon Angel, Maria Angeles; Orús Pérez, Raul; Ochieng, Washington; Feng, Shaojun; Jofre, Martí; Coutinho, Pedro; Samson, Jaron; Tossaint, Michel Mathias Maria
    IEEE transactions on geoscience and remote sensing
    Date of publication: 2012-09-21
    Journal article

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    This paper summarizes the main results obtained during the development of an Enhanced Precise Point Positioning (EPPP) Global Navigation Satellite Systems multifrequency user algorithm. The main innovations include the application of precise ionospheric corrections to facilitate the resolution of undifferenced carrier phase ambiguities, ambiguity validation, and integrity monitoring. The performance of the EPPP algorithm in terms of accuracy, convergence time, and integrity is demonstrated with actual GPS and simulated Galileo data. This can be achieved with very limited bandwidth requirements for EPPP users (less than 300 b/s for dual-frequency GPS data).

    This paper summarizes the main results obtained during the development of an Enhanced Precise Point Positioning (EPPP) Global Navigation Satellite Systems multifrequency user algorithm. The main innovations include the application of precise ionospheric corrections to facilitate the resolution of undifferenced carrier phase ambiguities, ambiguity validation, and integrity monitoring. The performance of the EPPP algorithm in terms of accuracy, convergence time, and integrity is demonstrated with actual GPS and simulated Galileo data. This can be achieved with very limited bandwidth requirements for EPPP users (less than 300 b/s for dual-frequency GPS data).

  • GNSS Processing Book Edition into NAVIPEDIA & gLAB Tool Website Development

     Sanz Subirana, Jaime; Rovira Garcia, Adrià; Juan Zornoza, Jose Miguel; Aragon Angel, Maria Angeles; Garcia Rigo, Alberto
    Participation in a competitive project

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  • Assessing the capabilities of the life-Galielo signals to support centimetre level absolute positioning accuracy.

     Sanz Subirana, Jaime; Juan Zornoza, Jose Miguel; Rovira Garcia, Adrià
    Participation in a competitive project

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  • Ionospheric conditions and associated scenarios for EGNOS selected from the last Solar Cycle (ICASES)

     Sanz Subirana, Jaime; Juan Zornoza, Jose Miguel
    Participation in a competitive project

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  • FP7-287203-G-NAVIS - GROWING NAVIS

     Juan Zornoza, Jose Miguel; Sanz Subirana, Jaime; Rovira Garcia, Adrià; Garcia Rigo, Alberto
    Participation in a competitive project

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  • GNSS Education Network for Industry and UniversitieS

     Juan Zornoza, Jose Miguel; Sanz Subirana, Jaime
    Participation in a competitive project

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  • Fast precise point positioning performance based on international GNSS real-time service data

     Rovira Garcia, Adrià; Juan Zornoza, Jose Miguel; Sanz Subirana, Jaime; Hernandez Pajares, Manuel
    ESA Workshop on Satellite Navigation Technologies
    Presentation's date: 2012-12-05
    Presentation of work at congresses

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  • Plasmaspheric Electron Content contribution inferred from ground and radio occultation derived Total Electron Content

     Aragon Angel, Maria Angeles; Sanz Subirana, Jaime; Juan Zornoza, Jose Miguel; Hernandez Pajares, Manuel; Altadill, D.
    IEEE International Conference on Communications
    Presentation's date: 2012
    Presentation of work at congresses

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  • Fast Precise Point Positioning for decimeter-error-level navigation for multi and single-frequency users of Global Navigation Satellite Systems

     Juan Zornoza, Jose Miguel; Hernandez Pajares, Manuel; Sanz Subirana, Jaime; Samson, J.; Tossaint, M.
    European Calibration and Orientation Workshop
    Presentation's date: 2012-02
    Presentation of work at congresses

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    This manuscript summarizes the new algorithm of Fast Precise Point Positioning (FPPP) the developed during the projects "Enhanced PPP GNSS multifrequency user algorithm" and ¿Precise Real Time Orbit Determination and Time synchronisation¿, both funded by the European Space Agency (ESA). The main innovations achieved during the overall project comprise the application of precise ionospheric corrections to facilitate the fast resolution of undifferenced carrier phase ambiguities, ambiguity validation and integrity monitoring for both multi- and single-frequency users. Among the integrity, detailed in previous works, the performance of the FPPP algorithm in terms of improved accuracy and convergence time is demonstrated with actual GPS and simulated Galileo data. The 10-centimeters error level real-time kinematic positioning can be achieved in few minutes for dual-and single-frequency users, almost instantaneous for three-frequency users (or once the tropospheric delay is well estimated in few minutes in cold start), and with very limited bandwidth requirements for the FPPP users (less than 300 bps for dual-frequency GPS)

    This manuscript summarizes the new algorithm of Fast Precise Point Positioning (FPPP) the developed during the projects "Enhanced PPP GNSS multifrequency user algorithm" nd “Precise Real Time Orbit Determination and Time synchronisation”, both funded by the European Space Agency (ESA). The main innovations achieved during the overall project comprise the application of precise ionospheric corrections to facilitate the fast resolution of undifferenced carrier phase ambiguities, ambiguity validation and integrity monitoring for both multi- and single-frequency users. Among the integrity, detailed in previous works, the performance of the FPPP algorithm in terms of improved accuracy and convergence time is demonstrated with actual GPS and simulated Galileo data. The 10-centimeters error level real-time kinematic positioning can be achieved in few minutes for dual-and single-frequency users, almost instantaneous for three-frequency users (or once the tropospheric delay is well estimated in few minutes in cold start), and with very limited bandwidth requirements for the FPPP users (less than 300 bps for dual-frequency GPS).

  • Fast Precise Point Positioning based on real-time ionospheric modelling

     Juan Zornoza, Jose Miguel; Hernandez Pajares, Manuel; Sanz Subirana, Jaime; Samson, Jaron; Tossaint, Michel Mathias Maria
    PPP-RTK & Open Standards Symposium
    Presentation's date: 2012-03-12
    Presentation of work at congresses

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    Summary of main results of new technique Fast Precise Point Positioning developed in the framework of the ¿Enhanced Precise Point Positioning (EPPP) GNSS multifrequency user algorithm¿ ESA funded project. -The precise ionospheric corrections facilitate the resolution of undifferenced carrier phase ambiguities, ambiguity validation and integrity monitoring. -The FPPP performance is shown in terms of accuracy, convergence time and integrity, with actual GPS and simulated Galileo data. -Very limited bandwidth requirements for future EPPP users (less than 300 bps for dual-frequency GPS data).

    Summary of main results of new technique Fast Precise Point Positioning developed in the framework of the “Enhanced Precise Point Positioning (EPPP) GNSS multifrequency user algorithm” ESA funded project. -The precise ionospheric corrections facilitate the resolution of undifferenced carrier phase ambiguities, ambiguity validation and integrity monitoring. -The FPPP performance is shown in terms of accuracy, convergence time and integrity, with actual GPS and simulated Galileo data. -Very limited bandwidth requirements for future EPPP users (less than 300 bps for dual-frequency GPS data).

  • Method, apparatus and system for determining a position of an object having a Global Navigation Satellite System receiver by processing undifferenced data like carrier phase measuurements and external products like ionosphere data

     Hernandez Pajares, Manuel; Juan Zornoza, Jose Miguel; Sanz Subirana, Jaime; Samson, Jaron; Tossaint, Michel Mathias Maria
    Date of request: 2012-10-04
    Invention patent

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  • Ground- and space-based GPS data ingestion into the NeQuick model

     Brunini, Claudio; Azpilicueta, Francisco; Gende, Mauricio; Camilon, E; Aragon Angel, Maria Angeles; Hernandez Pajares, Manuel; Juan Zornoza, Jose Miguel; Sanz Subirana, Jaime
    Journal of geodesy
    Date of publication: 2011-03-01
    Journal article

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  • Global prediction of the vertical total electron content of the ionosphere based on GPS data

     Garcia Rigo, Alberto; Monte Moreno, Enrique; Hernandez Pajares, Manuel; Juan Zornoza, Jose Miguel; Sanz Subirana, Jaime; Aragon Angel, Maria Angeles; Salazar Hernández, Dagoberto José
    Radio science
    Date of publication: 2011-12-29
    Journal article

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  • Improvement of retrieved FORMOSAT-3/COSMIC electron densities validated by ionospheric sounder measurements at Jicamarca

     Aragon Angel, Maria Angeles; Liou, Y.-A.; Lee, C.-C.; Reinisch, B. W.; Hernandez Pajares, Manuel; Juan Zornoza, Jose Miguel; Sanz Subirana, Jaime
    Radio science
    Date of publication: 2011-09-01
    Journal article

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  • The ionosphere: effects, GPS modeling and the benefits for space geodetic techniques

     Hernandez Pajares, Manuel; Juan Zornoza, Jose Miguel; Sanz Subirana, Jaime; Aragon Angel, Maria Angeles; Salazar Hernández, Dagoberto José; Escudero Royo, Miguel
    Journal of geodesy
    Date of publication: 2011-09-10
    Journal article

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  • PRODTS TN FR: Final Report

     Juan Zornoza, Jose Miguel; Ramos Bosch, Pedro; Sanz Subirana, Jaime; Aragon Angel, Maria Angeles
    Date: 2011-02-28
    Report

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  • Development of a GBAS ground station prototype: algorithms

     Sanz Subirana, Jaime; Gonzalez Casado, Guillermo; Juan Zornoza, Jose Miguel
    Date: 2011-05-06
    Report

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  • Development of a GBAS ground station prototype test results of the GBAS station in MATLAB

     Rovira-Garcia, A.; Sanz Subirana, Jaime; Juan Zornoza, Jose Miguel
    Date: 2011-09-15
    Report

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  • Precise real time GPS and GALILEO orbit determination & clock synchronization (PRTODTS)

     Hernandez Pajares, Manuel; Juan Zornoza, Jose Miguel; Sanz Subirana, Jaime
    Date: 2011-02-16
    Report

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  • Development of a GBAS ground station prototype: simulated data generation and test results of the GRS in Fortran

     Sanz Subirana, Jaime; Juan Zornoza, Jose Miguel; Garcia Rigo, Alberto; Rovira-Garcia, A.
    Date: 2011-09-16
    Report

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