Search Results for author: Ricardo Ferreira

Found 6 papers, 1 papers with code

One-Shot Initial Orbit Determination in Low-Earth Orbit

no code implementations20 Dec 2023 Ricardo Ferreira, Marta Guimarães, Filipa Valdeira, Cláudia Soares

Due to the importance of satellites for society and the exponential increase in the number of objects in orbit, it is important to accurately determine the state (e. g., position and velocity) of these Resident Space Objects (RSOs) at any time and in a timely manner.

Position

Probability of Collision of satellites and space debris for short-term encounters: Rederivation and fast-to-compute upper and lower bounds

no code implementations15 Nov 2023 Ricardo Ferreira, Cláudia Soares, Marta Guimarães

It is estimated that, in orbit, there are millions of fragments a few millimeters in size and thousands of inoperative satellites and discarded rocket stages.

Collision Avoidance Position

Classification of multi-frequency RF signals by extreme learning, using magnetic tunnel junctions as neurons and synapses

no code implementations2 Nov 2022 Nathan Leroux, Danijela Marković, Dédalo Sanz-Hernández, Juan Trastoy, Paolo Bortolotti, Alejandro Schulman, Luana Benetti, Alex Jenkins, Ricardo Ferreira, Julie Grollier, Alice Mizrahi

Extracting information from radiofrequency (RF) signals using artificial neural networks at low energy cost is a critical need for a wide range of applications from radars to health.

Probabilistic Registration for Gaussian Process 3D shape modelling in the presence of extensive missing data

no code implementations26 Mar 2022 Filipa Valdeira, Ricardo Ferreira, Alessandra Micheletti, Cláudia Soares

We propose a shape fitting/registration method based on a Gaussian Processes formulation, suitable for shapes with extensive regions of missing data.

Gaussian Processes regression

Deep Neural Networks for Approximating Stream Reasoning with C-SPARQL

no code implementations15 Jun 2021 Ricardo Ferreira, Carolina Lopes, Ricardo Gonçalves, Matthias Knorr, Ludwig Krippahl, João Leite

The amount of information produced, whether by newspapers, blogs and social networks, or by monitoring systems, is increasing rapidly.

Time Series Time Series Classification +1

From noisy point clouds to complete ear shapes: unsupervised pipeline

1 code implementation22 Aug 2020 Filipa Valdeira, Ricardo Ferreira, Alessandra Micheletti, Cláudia Soares

Ears are a particularly difficult region of the human face to model, not only due to the non-rigid deformations existing between shapes but also to the challenges in processing the retrieved data.

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