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LOFAR - low frequency array
In dit artikel zullen the authors LOFAR beschrijven: van de astronomische mogelijkheden met de nieuwe telescoop tot aan een nadere technische beshrijving of het instrument.
Radio-astronomical observations are increasingly corrupted by radio frequency interference, and on-line detection and filtering algorithms are becoming essential. To facilitate the introduction of
First LOFAR observations at very low frequencies of cluster-scale non-thermal emission: the case of Abell 2256
Abell 2256 is one of the best known examples of a galaxy cluster hosting large-scale diffuse radio emission that is unrelated to individual galaxies. It contains both a giant radio halo and a relic,
Radio frequency interference mitigation in radio astronomy
The next generation of radio telescopes is expected to be one to two orders of magnitude more sensitive than the current generation. Examples of such new telescopes are the Low Frequency Array
Gain calibration methods for radio telescope arrays
Weighted versions of the algorithms are proven to be asymptotically efficient and validated by simulations and application to experimental data observed at the Westerbork Synthesis Radio Telescope.
A Review of Near-Memory Computing Architectures: Opportunities and Challenges
This paper focuses on analyzing and organizing the extensive body of literature on near- memory computing across various dimensions: starting from the memory level where this paradigm is applied, to the granularity of the application that could be executed on the near-memory units.
Signal processing for radio astronomical arrays
Radio astronomy forms an interesting application area for array signal processing techniques. Current synthesis imaging telescopes consist of a small number of identical dishes, which track a fixed
Implementation of LOFAR RFI mitigation strategy
International RFI measurements will be presented and practical implementation issues such as the impact of Digital Video Broadcast, RF emissions from power lines and the influence of large wind turbines on the EM environment will be focused on.
Space-based aperture array for ultra-long wavelength radio astronomy
The aim of this article is to discuss the current trends and technologies towards the feasibility of a space-based aperture array for astronomical observations in the Ultra-Long Wavelength (ULW) regime of greater than 10 m i.e., below 30 MHz, and to avert single point of failure.
Spatial Filtering of RF Interference in Radio Astronomy Using a Reference Antenna Array
This paper considers extending the astronomical array with a reference antenna array, and develops spatial filtering algorithms for this situation, where the information from the reference antennas improves the quality of the interferer signature vector estimation, hence more of the interference can be projected out.