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We describe a multibeam receiver for the FAST radiotelescope. The receiver provides 19 dual polarised beams over a band of 1050–1450 MHz with an expected receiver noise temperature under 7 K and aperture efficiency of greater than 62%. The feed is currently undergoing final assembly and testing.
We describe recent developments in measuring both signal and noise in phased array feeds for radio astronomy at CSIRO. We introduce new techniques including aperture array noise measurements with beamforming weights matched to a reflector's focal field. Weights are calculated via antenna-range and in-reflector measurements. We also describe the separation of system temperature and aperture efficiency...
Various challenges have arisen in the measurement of phased array feeds for radiotelescopes. We focus here on measuring the equivalent noise temperature and the sensitivity of these feeds. We outline the differences between characterizing phased array feeds compared with traditional single horn feeds and provide results from our experience in developing phased array feeds for the Australian Square...
The Square Kilometre Array radio telescope (SKA) will be a next generation radio telescope, 100 to 1000 times more sensitive than any telescope currently available. The Australian Government has funded the CSIRO to develop and build the Australian Square Kilometre Array Pathfinder (ASKAP). This array of 36 antennas will have a total collecting area equivalent to 2% of the full SKA. We describe the...
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