A5028776434- Radio Astronomy Observations and Technology
- Satellite Communication Systems
- Spacecraft Design and Technology
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Electromagnetic Compatibility and Measurements
- Planetary Science and Exploration
- Stellar, planetary, and galactic studies
- Geophysics and Gravity Measurements
- Astronomical Observations and Instrumentation
- Radio Wave Propagation Studies
- Superconducting and THz Device Technology
- Space Technology and Applications
- Space Science and Extraterrestrial Life
- Antenna Design and Optimization
- Impact of Light on Environment and Health
- Space Satellite Systems and Control
- Space exploration and regulation
SKA Observatory
2019-2023
European Science Foundation
2023
We report on observations of 68 satellites belonging to the SpaceX Starlink constellation with LOFAR radio telescope. Radiation associated was detected at observing frequencies between 110 and 188 MHz, which is well below 10.7– 12.7 GHz used for downlink communication signals. A combination broad-band features, covering entire observed bandwidth, as narrow-band (bandwidth < 12.2 kHz) emission 125, 135, 143.05, 150, 175 observed. The presence properties both narrow- features vary different...
Large constellations of bright artificial satellites in low Earth orbit pose significant challenges to ground-based astronomy1. Current orbiting constellation have brightnesses between apparent magnitudes 4 and 6, whereas the near-infrared Ks band, they can reach magnitude 2 (ref. 2). Satellite operators, astronomers other users night sky are working on brightness mitigation strategies3,4. Radio emissions induce further potential risk radio telescopes that also need be evaluated. Here we...
We report on the detection of unintended electromagnetic radiation (UEMR) from second-generation Starlink satellites. Observations with LOFAR radio telescope between 10 to 88 MHz and 110 188 show broadband emission covering frequency ranges 40 70 v2-Mini Direct-to-Cell The spectral power flux density this UEMR varies satellite satellite, values ranging 15 1300 Jy, 56 66 MHz, 2 100 Jy over two distinct 8 centered at 120 161 MHz. compared detected densities that emitted by first generation...
SatHub is one of the four hubs IAU Centre for Protection Dark and Quiet Sky from Satellite Constellation Interference (CPS). It focuses on observations, data analysis, software, training materials to improve our understanding impact satellite constellations astronomy observers worldwide. As a preface more in-depth IAUS385 sessions, we gave summary some recent work by members current status constellations, including optical radio observations. We shared how audience can join or get involved,...
We report on the detection of unintended electromagnetic radiation (UEMR) from second-generation Starlink satellites. Observations with LOFAR radio telescope between 10 to 88MHz and 110 188MHz show broadband emission covering frequency ranges 40 70MHz v2-Mini Direct-to-Cell The spectral power flux density this UEMR varies satellite satellite, values ranging 15Jy 1300Jy, 56 66MHz, 2 100Jy over two distinct 8MHz centered at 120 161MHz. compared detected densities that emitted by first...
The growing number of satellite constellations in low Earth orbit (LEO) enhances global communications and observation, support space commerce is a high priority many governments. At the same time, proliferation satellites LEO has negative effects on astronomical observations research, preservation dark quiet sky. These reflect sunlight onto optical telescopes, their radio emission impacts observatories, jeopardising our access to essential scientific discoveries through astronomy. changing...
Large LEO satellite constellations (or so-called Mega-constellations) will significantly change the view of sky in some radio frequency bands. For VGOS telescopes it is important to understand potential impact these have their operations, what risk its receivers going into non-linear behaviour and how much additional power would a telescope receive if observing same frequencies where satellites are transmitting. This work describes three new (as they look fully deployed) summarizes results...
Abstract Large constellations of bright artificial satellites in low Earth orbit pose significant challenges to ground-based astronomy [1]. Currently orbiting constellation have visual brightnesses between apparent magnitudes 4 and 6, satellite operators, astronomers, other users the night sky are working on brightness mitigation strategies [2,3]. Here we report outcome an international optical observation campaign a prototype satellite, AST Space Mobile’s “BlueWalker 3”. BlueWalker 3...
The Committee on Radio Astronomy Frequencies (CRAF) is an Expert of the European Science Foundation. It aims to provide a cost-effective single voice frequency protection issues for radio astronomy observatories and research institutes, achieving significantly greater impact than that achievable by individual national institutions. By working together, institutes can profit from synergy effects, cover many more topics, learn each other. CRAF was founded in 1988 has since then been engaged...
Modern radio telescopes, like the proposed Square Kilometre Array (SKA), are extremely sensitive and faint signals they receive can easily be contaminated irreversibly by stray frequency interference (RFI). Understanding how telescope performance is degraded RFI important. In this paper we describe an simulation framework that used to generate test stimulus verify a telescope's performance. The during design investigate impact of various scenarios develop mitigation strategies. As well, it...