Papers › An Update on the External Calibrator for Hydrogen Observatories (ECHO)
An Update on the External Calibrator for Hydrogen Observatories (ECHO)
Yifan Zhao, Daniel C. Jacobs, Titu Samson, Mrudula Gopal Krishna, Michael Horn, Marc-Olivier R. Lalonde, Raven Braithwaite, Logan Skabelund
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Precision measurements of the beam pattern response are needed to predict the response of a radio telescope. Mapping the beam of a low frequency radio array presents a unique challenge and science cases such as the observation of the 21\,cm line at high redshift have demanding requirements. Drone-based systems offer the unique potential for a measurement which is entirely under experimenter control, but progress has been paced by practical implementation challenges. Previously, a prototype drone system, called the External Calibrator for Hydrogen Observatories (ECHO), demonstrated good performance in making a complete hemispherical beam measurement. This paper reports updates to the system focusing on performance of a new drone platform, minimizing interference from the drone, and a new transmitter.
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