Results 41 to 50 of about 4,598 (208)

Decoding Space Radio Waves: Self‐Supervised AI Deciphers Plasma Frequency

open access: yesRadio Science, Volume 60, Issue 7, July 2025.
Abstract This article presents a methodology for the extraction of plasma frequency from the upper hybrid resonance traces obtained from space‐based wave spectrograms utilizing self‐supervised artificial intelligence. It elaborates on the development and implementation of a deep learning model.
Yi‐Jiun Su, John A. Carilli
wiley   +1 more source

The Open Service Signal in Space Navigation Data Comparison of the Global Positioning System and the BeiDou Navigation Satellite System

open access: yesSensors, 2014
More and more Global Navigation Satellite Systems (GNSSs) have been developed and are in operation. Before integrating information on various GNSSs, the differences between the various systems must be studied first. This research focuses on analyzing the
Shau-Shiun Jan, An-Lin Tao
doaj   +1 more source

Global Structure of the Cislunar Magnetotail and Its Evolution During Substorms

open access: yesJournal of Geophysical Research: Space Physics, Volume 130, Issue 7, July 2025.
Abstract So far, the structure and dynamics of the terrestrial magnetotail have largely been investigated within 31RE $31{R}_{E}$ (RE ${R}_{E}$ is the Earth's radius) because of the lack of in‐situ observations beyond that distance, as well as limitations of earlier empirical models.
M. I. Sitnov   +4 more
wiley   +1 more source

Deep Space Network Radio Science and Ground‐Based Planetary Radar in the Next Decade

open access: yesRadio Science, Volume 60, Issue 7, July 2025.
Abstract The Deep Space Network (DSN) has been a core operational element of NASA's crewed and robotic exploration of the Solar System since the early 1960s. The primary role of the DSN has been to acquire telemetry and navigation data, but over the years, its radiometric and radar capabilities have expanded to form a system for obtaining unique ...
R. S. Park   +13 more
wiley   +1 more source

Real-Time LEO Satellite Orbits Based on Batch Least-Squares Orbit Determination with Short-Term Orbit Prediction

open access: yesRemote Sensing, 2022
The augmentation of the Global Navigation Satellite System (GNSS) by Low Earth Orbit (LEO) satellites is proposed as an effective method to improve the precision and shorten the convergence time of Precise Point Positioning (PPP).
Kan Wang   +4 more
doaj   +1 more source

Ephemeris of Virginia [PDF]

open access: yesAstronomische Nachrichten
n ...
openaire   +2 more sources

Prospects of Using Tidal Tomography to Constrain Ganymede's Interior

open access: yesGeophysical Research Letters, Volume 52, Issue 11, 16 June 2025.
Abstract Juice (JUpiter ICy moons Explorer) 3GM Radio Science Experiment will map the gravitational field of Ganymede with unprecedented accuracy and measure tidally‐induced variations. These measurements will allow the characterization of its putative ocean and may resolve lateral variations in internal structure.
M. Rovira‐Navarro   +5 more
wiley   +1 more source

Improving BDS broadcast ephemeris accuracy using ground-satellite-link observations

open access: yesSatellite Navigation, 2022
The BeiDou Navigation Satellite System (BDS) employs a hybrid constellation including GEO (Geosynchronous Earth Orbit), IGSO (Inclined Geosynchronous Orbit), and MEO (Medium Earth Orbit) satellites, where the GEO and IGSO satellites are critical to ...
Junping Chen   +4 more
doaj   +1 more source

Performance Analysis of BDS-3 SAIM and Enhancement Research on Autonomous Satellite Ephemeris Monitoring

open access: yesRemote Sensing, 2022
Integrity is one of the key indicators used to characterize the performance of the global navigation satellite systems (GNSSs) and is closely related to user safety.
Lei Chen   +10 more
doaj   +1 more source

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