A5079948646- Geophysics and Gravity Measurements
- Geomagnetism and Paleomagnetism Studies
- Astro and Planetary Science
- Solar and Space Plasma Dynamics
- GNSS positioning and interference
- Planetary Science and Exploration
- Spacecraft Dynamics and Control
- Inertial Sensor and Navigation
- Aerospace Engineering and Control Systems
- Statistical and numerical algorithms
- Numerical methods for differential equations
- Space Satellite Systems and Control
- Quantum chaos and dynamical systems
- Ionosphere and magnetosphere dynamics
- High-pressure geophysics and materials
- Scientific Research and Discoveries
- Differential Equations and Numerical Methods
- Higher Education Teaching and Evaluation
- Stellar, planetary, and galactic studies
- Spacecraft Design and Technology
- Methane Hydrates and Related Phenomena
- Relativity and Gravitational Theory
- earthquake and tectonic studies
- E-Learning and Knowledge Management
- Mathematics and Applications
University of Alicante
2015-2024
Universidad de Valladolid
1988-1995
Universidad de Zaragoza
1985
Abstract Predicting Earth Orientation Parameters (EOP) is crucial for precise positioning and navigation both on the Earth’s surface in space. In recent years, many approaches have been developed to forecast EOP, incorporating observed EOP as well information effective angular momentum (EAM) derived from numerical models of atmosphere, oceans, land-surface dynamics. The Second Prediction Comparison Campaign (2nd PCC) aimed comprehensively evaluate forecasts international participants...
Accurate Earth orientation parameter (EOP) predictions are needed for many applications, e.g., the tracking and navigation of interplanetary spacecraft missions. One most difficult parameters to forecast is length day (LOD), which represents variation in Earth's rotation rate since it primarily affected by torques associated with changes atmospheric circulation. In this study, a new-generation time-series prediction algorithm developed. The one-dimensional convolutional neural network (1D...
This paper introduces a general technique for the construction of multistep methods capable integrating, without local truncation error, homogeneous linear ODEs with constant coefficients, including those, in particular, that result oscillatory solutions. Moreover, these can be further adapted through coefficient modification exact integration forced oscillations one or more frequencies, even confluent ones occur from nonhomogeneous terms differential equation. Our procedure allows...
Abstract Accurate, short-term predictions of Earth orientation parameters (EOP) are needed for many real-time applications including precise tracking and navigation interplanetary spacecraft, climate forecasting, disaster prevention. Out the EOP, LOD (length day), which represents changes in Earth’s rotation rate, is most challenging to predict since it largely affected by torques associated with atmospheric circulation. In this study, combination Copula-based analysis singular spectrum...
The real-time estimation of polar motion (PM) is needed for the navigation Earth satellite and interplanetary spacecraft. However, it impossible to have information due complexity measurement model data processing. Various prediction methods been developed. accuracy PM still not satisfactory even a few days in future. Therefore, new techniques or combination existing need be investigated improving predicted PM. There well-introduced method called Copula, we want combine with singular...
This study introduces a methodology designed to enhance the accuracy of Celestial Pole Offset (dX, dY) prediction, with focus on short-term forecast horizon (up 30-days). IERS EOP final data as well those published by JPL are used input for the  prediction algorithms. The procedure is consistent, in sense that, it does not rely any external fill latency gaps product. handled within routine itself enlarging gap filling and proper horizon. In this way, presented ready use under...
The need to improve Earth rotation theories and models in a consistent accuratemanner is currently widely recognized. Several researchers groups at differentinstitutions have been working on this problem using quite different approaches, eitherfrom the theoretical or computational perspective.A potential source of loss accuracy celestial pole offsets can be due themismodeling planetary component IAU2000 nutation series. In fact, asrecognized Ferrándiz et al. (2018), actually based...
A characterization of Earth rotation makes possible to perform the ubiquitious transformation between terrestrial and celestial systems. How this is implemented in practice addressed different IAU/IUGG/IAG resolutions described extensively IERS Conventions.In last years several IAU/IAG joint working groups on have called attention limitations existing models, which date back early 2000s, considering current demands determination (about 1mm surface). In fact, two by IAG (No.5, 2019) IAU...
Various features of the Earth system, including its shape, gravitational field, and orientation in space, can be measured through geodetic observations. These measurements play a vital role both scientific research practical applications, as evidenced by their contributions to study geodynamic events, climate change monitoring, navigation space on Earth. Recognizing importance these characteristics, Global Geodetic Observing System (GGOS) recently initiated definition Essential Variables...
Ocean angular momentum (OAM), a measure of the rotational motion oceanic fluid masses, undergoes alterations as consequence changes in both distribution ocean mass and direction speed currents. While number products provide estimates these changes, they rely on global current models.Geostrophic currents (GC) represent dominant patterns ocean, emerging from equilibrium between Coriolis force pressure gradient force. They play pivotal role shaping circulation patterns. With advent satellite...
Over the past decade, IVS has undertaken enormous efforts to modernize its infrastructure under VGOS (VLBI global observing system) umbrella in order meet objectives set forth by GGOS. Key feature are smaller, faster antennas facilitate a better sky coverage, equipped with broad-band receivers between 2-14 GHz reach signal-to-noise ratio. Another innovation of twin telescopes, i.e. two at same location, separated only dozens meters. Currently three pairs deployed. And all antennas, exception...
The accuracy and reliability of Earth Orientation Parameters (EOP) are significantly influenced by the geometric configuration Very Long Baseline Interferometry (VLBI) network. This astronomical technique employs a global network radio telescopes to collect data. distribution VLBI antennas affects triangulation process used determine positions celestial sources, which is integral calculation EOP. An optimal geometry yields more accurate reliable EOP results, essential for many scientific...
Over the last decade, International Astronomical Union (IAU) and Association of Geodesy (IAG) have organised successive Joint Working Groups (JWGs) to study in depth current theories models Earth rotation, which are paramount importance for general geodesy astronomy, positioning navigation on space particular. Their activities resulted IAU IAG resolutions encouraging improvement such models, particularly with regard consistency accuracy Orientation Parameters (EOPs). In this communication,...
A Global Geodetic Observing System (GGOS) affiliate is an organization or entity that collaborates with the to enhance global geodetic infrastructure and support objectives of GGOS in a region.With this goal, was created scientific collaboration across Iberian Peninsula Atlantic region. It called IberAtlantic. This project focuses on improving accuracy reliability geospatial data through co-location integration space techniques various practical applications, including reference frame...
Accurate short-term prediction of Celestial Pole Offsets (CPO), essential for applications such as satellite navigation and space geodesy, remains a significant challenge. We addressed this task using 1D Convolutional Neural Network (1D CNN), machine learning model designed to capture temporal patterns effectively. Our objective was enhance the accuracy key CPO components, dX dY. To improve interpretability, we employed SHapley Additive exPlanations (SHAP), which identifies most influential...
In this paper we present a simple technique that allows us to limit the error growth in long–term numerical integration of perturbed multi–dimensional oscillators, while using highly efficient and accurate special multi–step codes. After laying down theoretical basis their behaviour, then illustrate them with some examples, including case non–resonant frequencies, seldom found related literature.
Abstract Over the years, prediction techniques for highly variable angular velocity of Earth represented by Earth's rotation (UT1-UTC) and length-of-day (LOD) have been continuously improved. This is because many applications like navigation, astronomy, space exploration, climate studies, timekeeping, disaster monitoring, geodynamic all rely on predictions these parameters. They provide early warning changes in rotation, allowing various industries scientific fields to operate more precisely...
Abstract Growing interest in Earth Orientation Parameters (EOP) resulted various approaches to the EOP prediction algorithms, as well exploitation of distinct input data, including observed values from operational data centers and modeled effective angular momentum functions. Considering these developments recently emerged new methodologies, Second Prediction Comparison Campaign (2nd PCC) was pursued 2021–2022. The campaign led by Centrum Badań Kosmicznych Polskiej Akademii Nauk cooperation...
In 1971 Scheifele designed a method for the integration of perturbed oscillators by refining classical power series. This consists defining certain sequence entire functions and finding sought solution in form linear combination them using coefficients obtained through recurrence formulas. spite good behavior method, it is only practical use few particular cases, which force function very simple, given complexity preliminary calculations needed to obtain problem resolved this article...