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Efficient Wideband Gain Modeling for Interferometric Imaging Arrays in Radio Astronomy

A. Young ; D. B. Davidson ; S. J. Wijnholds ; T. D. Carozzi ; Rob Maaskant (Institutionen för signaler och system, Antennsystem) ; Marianna Ivashina (Institutionen för signaler och system, Antennsystem)
2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, APS 2015, Vancouver, Canada, 19-24 July 2015 (1522-3965). p. 1374-1375. (2015)
[Konferensbidrag, refereegranskat]

Current and future interferometric imaging arrays in radio astronomy may be limited by the accuracy with which various direction-dependent effects, such as the antenna gain patterns, can be corrected. Doing this in an efficient manner during the calibration and imaging process is especially difficult due to these effects often being also baseline-dependent. A newly proposed method, called A-stacking, offers a solution through the use of a parametrized model in which basis functions account for the direction-dependence and the expansion coefficients account for the baseline-dependence. This approach provides a simple trade-off between computational complexity and calculation accuracy. Herein the use of the A-stacking method to model direction-dependent effects over a very wide frequency band is investigated.



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Denna post skapades 2015-12-10. Senast ändrad 2017-03-21.
CPL Pubid: 227915

 

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