Calibration of active antenna arrays using a sky brightness model

Details Calibration of active antenna arrays using a sky brightness model Calibration of active antenna arrays using a sky brightness model

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004rasc...39.2023r&link_type=abstract

Radio Science, Volume 39, Issue 2, CiteID RS2023

Astronomy and Astrophysics

Astronomy

5

Electromagnetics: Antenna Arrays, Radio Science: Radio Astronomy, Radio Science: Instruments And Techniques

Scientific paper

Low-frequency arrays (120-400 MHz) can be calibrated using a sky model based on sky maps. For a single antenna the variation of measured power with the Earth's rotation is needed to separate receiver gain and noise temperature. For an array an instantaneous calibration can be made using normalized correlations or normalized beam power for which the receiver gain cancels out. Examples of the sky model for various antenna orientations are shown along with measured data used to perform a calibration. The effects of unmodeled mutual coupling of the received signals and receiver noise on the calibration method are analyzed and are found to result in errors of only a few percent in an array of 5 × 5 crossed dipoles designed to observe the deuterium line at 327 MHz.

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