TY - JOUR
T1 - Radio interferometric calibration via ordered-subsets algorithms
T2 - OS-LS and OS-SAGE calibrations
AU - Kazemi, S.
AU - Yatawatta, S.
AU - Zaroubi, S.
PY - 2013/10
Y1 - 2013/10
N2 - The main objective of this work is to accelerate the maximum likelihood (ML) estimation procedure in radio interferometric calibration. We introduce the ordered-subsets-least-squares (OS-LS) and the ordered-subsets-space alternating generalized expectation (OS-SAGE) radio interferometric calibration methods, as a combination of the OS method with the LS and SAGE maximization calibration techniques, respectively. The OS algorithm speeds up theML estimation and achieves nearly the same level of accuracy of solutions as the one obtained by the non-OS methods. We apply the OS-LS and OS-SAGE calibration methods to simulated observations and show that these methods have a much higher convergence rate relative to the conventional LS andSAGEtechniques. Moreover, the obtained results showthat theOS-SAGE calibration technique has a superior performance compared to the OS-LS calibration method in the sense of achieving more accurate results while having significantly less computational cost.
AB - The main objective of this work is to accelerate the maximum likelihood (ML) estimation procedure in radio interferometric calibration. We introduce the ordered-subsets-least-squares (OS-LS) and the ordered-subsets-space alternating generalized expectation (OS-SAGE) radio interferometric calibration methods, as a combination of the OS method with the LS and SAGE maximization calibration techniques, respectively. The OS algorithm speeds up theML estimation and achieves nearly the same level of accuracy of solutions as the one obtained by the non-OS methods. We apply the OS-LS and OS-SAGE calibration methods to simulated observations and show that these methods have a much higher convergence rate relative to the conventional LS andSAGEtechniques. Moreover, the obtained results showthat theOS-SAGE calibration technique has a superior performance compared to the OS-LS calibration method in the sense of achieving more accurate results while having significantly less computational cost.
KW - Interferometric
KW - Methods
KW - Numerical-methods
KW - Statistical-techniques
UR - http://www.scopus.com/inward/record.url?scp=84885130107&partnerID=8YFLogxK
U2 - 10.1093/mnras/stt1229
DO - 10.1093/mnras/stt1229
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AN - SCOPUS:84885130107
SN - 0035-8711
VL - 434
SP - 3130
EP - 3141
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -