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The Radio Array of Portable Interferometric Detectors (RAPID) is a spatially diverse sparse radio array. It has been designed to be deployed and reconfigured easily for scientific applications. These applications include both geospace and astronomy experiments where a relatively small and sparse aperture is sufficient in size. Examples include the study of ionospheric turbulence using active and passive...
The Square Kilometre Array - Aperture Array Mid-frequency instrument will be surveying the southern hemisphere skies with unprecedented sensitivity in the mid 2020s at frequencies from 400MHz up to the 21 cm Hydrogen line. The University of Cambridge is developing a sparse random array solution based on log-periodic dipole array antennas within the Aperture Array Design Consortium. This type of array...
THE Square Kilometre Array, SKA is the next generation low frequency radio telescope and is described on its website [1]. The work performed in the European funded FP6 programme, SKA Design Studies, SKADS, [2] showed that an implementation of the SKA using phased aperture arrays, AAs, operating from 50MHz up to 1.4GHz with a dish based array covering ∼1.2GHz to 10GHz represents the most capable design...
We report characterization results for an engineering prototype of a next-generation low-frequency radio astronomy array. This prototype, which we refer to as the Aperture Array Verification System 0.5 (AAVS0.5), is a sparse pseudorandom array of 16 log-periodic antennas designed for 70–450 MHz. It is colocated with the Murchison widefield array (MWA) at the Murchison radioastronomy observatory (MRO)...
The Radio Array of Portable Interferometric Detectors (RAPID) is an advanced radio designed for multi-role applications. The system implements a spatially diverse sparse array technology and can be deployed and reconfigured easily. Data are captured at the raw voltage level using the system in the field and processed post-experiment. Signal processing for the system is software defined and uses a...
Signal processing combined with communications technology are at the heart of all advanced radio telescope systems. Modern IT can provide the radical improvements in capability and performance that are driving the science capabilities of the current and planned instruments. At the forefront of improved performance are the “all-electronic” collector technologies, aperture arrays. We discuss the implementation...
We present an in-situ antenna characterization method and results for a “low-frequency” radio astronomy engineering prototype array, characterized over the 75–300 MHz frequency range. The presence of multiple cosmic radio sources, particularly the dominant Galactic noise, makes in-situ characterization at these frequencies challenging; however, it will be shown that high quality measurement is possible...
Signal processing combined with communications technology are at the heart of all advanced radio telescope systems. Modern IT can provide the radical improvements in capability and performance that are driving the science capabilities of the current and planned instruments. At the forefront of improved performance are the “all-electronic” collector technologies, aperture arrays. In this paper we discuss...
A design of a log-periodic antenna to cover the Medium Frequency Aperture Array (MFAA) band for the Square Kilometre Array (SKA) is described and the simulated results are presented in this paper. In order to obtain a smaller footprint, which will allow specifying the transition between sparse and dense regimes in the array at high frequencies, a smaller version of the initial model has been developed...
Higher frequency Aperture Array technology, up to 1.5GHz, is being prepared for large scale deployment in radio astronomy. Novel approaches in order to increase performance and lower the production costs are a key element of the success as well as scientific demonstration. This paper describes the current status, technology innovations and planned demonstrators.
This paper describes the important design aspects of an array antenna for the low frequency instrument of the SKA telescope (SKA-low). The most important considerations to meet the telescope performance requirements are discussed. Finally, a plot of the expected sky brightness sensitivity for phase I of the SKA using log-periodic antennas is presented.
This paper provides an overview of the Aperture Array Verification System 0.5 (AAVS 0.5), co-located and operated in conjunction with the Murchison Widefield Array (MWA) near the Australian SKA core site. AAVS 0.5 is based on log-periodic antennas of a type potentially useful in next-generation low-frequency arrays such as SKA-low. We report on our progress by discussing results obtained thus far...
The Radio array of portable interferometric detectors (RAPID) is a new radio array with a flexible architecture. The instrument uses per element software defined radios and a software signal processing architecture to enable the flexible study of a wide range of natural phenomena using radio imaging techniques. The array will be used for investigations of ionospheric phenomena, solar radio emission,...
Aperture Arrays are a major collector technology for the Square Kilometre Array, SKA, covering both the low, 70–450MHz, and mid-frequencies, 400–1450MHz. They provide the very high survey speed performance and ability to have extremely large collector areas at the low frequencies. Aperture arrays consist of a large number, up to millions, of small, fixed receiving elements arranged into logical stations,...
The radio astronomy community is entering a new era with the design and planned construction of the Square Kilometre Array (SKA). The SKA will have 10–100 times improved sensitivity and 105 survey speed compared to existing radio telescopes. Besides a large number of dishes, Aperture Arrays (AA) are being considered, promising the potential of a very large Field of View (FoV): the FoV for AA's is...
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