Stefan J. Wijnholds, "Beam Shape Calibration for Multi-Beam Radio Astronomical Phased Arrays," European Signal Processing Conference (EuSiPCo), Rome (Italy), 3-7 September 2018.
The ability of phased array systems to form multiple
beams simultaneously holds great promise to revolutionise radio
astronomy by enlarging the instantaneous sky coverage. Currently,
measurements obtained by different beams are largely
treated as separate observations. In this paper, a new approach
to beam shape calibration, i.e., the calibration of direction
dependent instrumental gains, is presented, in which the fact
that these observations are done simultaneously is adequately
exploited. It follows from imposing a novel spatial constraint
on the direction dependent instrumental gain model. It may
provide better calibration performance and may even allow beam
shape calibration in scenarios in which the observations with the
individual beams provide insufficient information to do so when
they are treated as separate observations.
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