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This is an overview of the system level RF design for the second generation architecture used in the Australian Square Kilometre Array Pathfinder (ASKAP) [1] design enhancement (ADE). ADE is a distributed antenna system (DAS) of 36 reflector antennas each 12m in diameter. Each antenna has a planar Phased Array Feed (PAF) at the prime focus. The PAF contains 188 broadband 700–1800MHz receptors. Inside...
The ASKAP radio telescope in Australia is the first synthesis imaging array to use phased-array feeds (PAFs). These permit wider fields of view and new modalities for radio-frequency interference (RFI) mitigation. Previous work on imaging-array RFI cancellation has assumed that processing bandwidths are very narrow, and correlator integration times are short. However, these assumptions do not necessarily...
We review metrics to assess the radio quietness of sites used for radio astronomy. Concise metrics are needed to compare candidate sites for new telescopes, to monitor the quality of existing sites, and to design telescopes to work well at a given site. Key points of assessment are the receiver dynamic range required for the strongest interferers and the expected fraction of spectrum available for...
On behalf of the ASKAP team, this paper reviews the goals and status of the Australian Square Kilometre Array Pathfinder (ASKAP). ASKAP demonstrates key concepts for the Square Kilometre Array (SKA) radio telescope including: phased array feeds, high performance computing, and a radio quiet site suitable for the most sensitive radio telescope. ASKAP is being deployed to the Murchison Radio-astronomy...
Phased array feeds enable radio telescopes to make faster surveys with fewer antennas. This paper presents testing of a phased array feed prototype to verify design methods for array feeds of the Australian Square Kilometre Array Pathfinder (ASKAP). We have tested a 5 × 4 port × 2 polarisation connected-chequerboard array at the prime focus of a 12 m diameter parabolic reflector. This prototype system...
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