Results 101 to 110 of about 4,973 (237)
Geosynchronous synthetic aperture radar: design and applications [PDF]
, 2009 Synthetic Aperture Radar (SAR) imaging from geosynchronous orbit has significant potential advantages over conventional low-Earth orbit (LEO) radars, but also challenges to overcome.
Bruno, Davide
core
An Unsupervised Learning Method for Radio Interferometry Deconvolution
The Astrophysical Journal Supplement SeriesGiven the incomplete sampling of spatial frequencies by radio interferometers, achieving precise restoration of astrophysical information remains challenging.
Lei Yu +5 more
doaj +1 more source
Soft Ferroelectrics in One Dimension: Ferroelectric Columnar Liquid Crystals
ChemPlusChem, Volume 91, Issue 6, June 2026.Helical ferroelectric columnar liquid crystals (FCLCs) confine bistable axial polarization within individual columns. An electric field reversibly flips the macrodipole, enabling two nonvolatile states readable as “0” and “1.” This Cconcept highlights supramolecular locking and helical architectures that deliver genuine switching and long‐lived zero ...
Seongwon Park, Byoung‐Ki Cho
wiley +1 more source
Broadband phase switches for radio-frequency and microwave interferometry
, 1971 Two wideband phase switches have been built for radio and microwave interferometry. In one, the directions of current flow in a balanced transmission line are reversed periodically. The line is coupled into the interferometer via broadband baluns.
Parker, Edward A., Nicholson, P.S.
core +1 more source
VaDAR: Varstrometry for Dual AGN Using Radio Interferometry
The Astrophysical JournalBinary and dual active galactic nuclei (AGNs) are an important observational tool for studying the formation and dynamical evolution of galaxies and supermassive black holes.
Emma Schwartzman +7 more
doaj +1 more source
Multi agent control for space based interferometry
, 2009 Agent systems have been accepted and used advantageously by computer scientists sincetheir inception, but such systems have not been used so readily within the realms of controlengineering or robotics.
Lincoln, N.K.
core
Design and Verification of a Clock System for Orbital Radio Interferometry
, 2020 Radio interferometry using multiple small satellites will enable measurements with high angular resolution for remote sensing and astronomy. The NASA sponsored Auroral Emissions Radio Explorer (AERO) and Vector Interferometry Space Technology using AERO (
Serra, Paul +7 more
core
, 2006 Recent studies have demonstrated the usefulness of global positioning system (GPS) receivers for relative positioning of formation-flying satellites using dual-frequency carrier-phase observations. The accurate determination of distances or baselines
D'Amico, Simone +2 more
core +1 more source
Kalman filter for radio source power and direction of arrival estimation
EURASIP Journal on Advances in Signal ProcessingImages are an important source of information for spacecraft navigation. Based on an image and a known attitude, triangulation techniques (intersection or resection) are often used for positioning and navigation.
Cyril Cano +5 more
doaj +1 more source
Nonlinear Kalman filters for calibration in radio interferometry [PDF]
Astronomy & Astrophysics, 2014 We present a new calibration scheme based on a non-linear version of Kalman filter that aims at estimating the physical terms appearing in the Radio Interferometry Measurement Equation (RIME). We enrich the filter's structure with a tunable data representation model, together with an augmented measurement model for regularization.
openaire +3 more sources