4 August 2014 Using feed array networks to control distortions in antenna reflector for astrophysical radio-astronomy
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Abstract
In this paper we present a methodology to calibrate and correct frequency-dependent errors in phased-array antennas with large signal bandwidth and large size. If the receivers are not narrow-band, the hypotheses of constant gain and group delay are not valid. If the frequency responses of the receivers are affected by mismatches, this will also impact directivity. Standard Amplitude and Phase Correction (APC) algorithms will not be effective in this case, and a more advanced complex FIR filtering algorithm is used. A transmitted signal is assumed to be known in order to provide a reference and estimate the optimal calibration coefficients of the FIR filters.
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F. Centurelli, F. Centurelli, P. Monsurrò, P. Monsurrò, F. Romano, F. Romano, G. Scotti, G. Scotti, Pasquale Tommasino, Pasquale Tommasino, A. Trifiletti, A. Trifiletti, } "Using feed array networks to control distortions in antenna reflector for astrophysical radio-astronomy", Proc. SPIE 9145, Ground-based and Airborne Telescopes V, 914523 (4 August 2014); doi: 10.1117/12.2055521; https://doi.org/10.1117/12.2055521
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