60 research outputs found
Reduced Ambiguity Calibration for LOFAR
Interferometric calibration always yields non unique solutions. It is
therefore essential to remove these ambiguities before the solutions could be
used in any further modeling of the sky, the instrument or propagation effects
such as the ionosphere. We present a method for LOFAR calibration which does
not yield a unitary ambiguity, especially under ionospheric distortions. We
also present exact ambiguities we get in our solutions, in closed form. Casting
this as an optimization problem, we also present conditions for this approach
to work. The proposed method enables us to use the solutions obtained via
calibration for further modeling of instrumental and propagation effects. We
provide extensive simulation results on the performance of our method.
Moreover, we also give cases where due to degeneracy, this method fails to
perform as expected and in such cases, we suggest exploiting diversity in time,
space and frequency.Comment: Draft version. Final version published on 10 April 201
Half-sandwich ruthenium(II) complexes with N- and N,(N,O)-donor ligands: molecular, electronic structures, and computational study
Comparison of 10 single and stepped methods to identify frail older persons in primary care: diagnostic and prognostic accuracy
Geriatric screening tools are of limited value to predict decline in functional status and quality of life: results of a cohort study
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SUPERCONDUCTING AND MAGNETIC-PROPERTIES OF RERHXSNY COMPOUNDS WITH RE = EU,HO,ER AND TM
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