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Astronomical receiver modelling using scattering matrices

King, O. G. and Jones, Michael E. and Copley, C. and Davis, R. J. and Leahy, J. P. and Leech, J. and Muchovej, S. J. C. and Pearson, T. J. and Taylor, Angela C. (2015) Astronomical receiver modelling using scattering matrices. Monthly Notices of the Royal Astronomical Society, 446 (2). pp. 1252-1267. ISSN 0035-8711. doi:10.1093/mnras/stu2172.

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Proper modelling of astronomical receivers is vital: it describes the systematic errors in the raw data, guides the receiver design process, and assists data calibration. In this paper, we describe a method of analytically modelling the full signal and noise behaviour of arbitrarily complex radio receivers. We use electrical scattering matrices to describe the signal behaviour of individual components in the receiver, and noise correlation matrices to describe their noise behaviour. These are combined to produce the full receiver model. We apply this approach to a specified receiver architecture: a hybrid of a continuous comparison radiometer and correlation polarimeter designed for the C-Band All-Sky Survey. We produce analytic descriptions of the receiver Mueller matrix and noise temperature, and discuss how imperfections in crucial components affect the raw data. Many of the conclusions drawn are generally applicable to correlation polarimeters and continuous comparison radiometers.

Item Type:Article
Related URLs:
URLURL TypeDescription
Jones, Michael E.0000-0003-3564-6680
Pearson, T. J.0000-0001-5213-6231
Additional Information:© 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2014 October 16. Received 2014 October 16; in original form 2014 September 5. First published online November 19, 2014. The C-BASS project is a collaboration between Caltech/JPL in the US, Oxford and Manchester Universities in the UK, and Rhodes University and the Hartebeesthoek Radio Astronomy Observatory in South Africa. It is funded by the NSF (AST-0607857, AST-1010024, and AST-1212217), the University of Oxford, the Royal Society, and the other participating institutions. We thank Russ Keeney for technical support of the C-BASS project at OVRO. We thank the Xilinx University Programme for their donation of FPGAs to this project. OGK acknowledges the support of a Dorothy Hodgkin Award in funding his studies while a student at Oxford, and the support of a W.M. Keck Institute for Space Studies Postdoctoral Fellowship at Caltech. ACT acknowledges support from a Royal Society Dorothy Hodgkin Fellowship. CC acknowledges the support of the Commonwealth Scholarship, Square Kilometer Array South Africa and Hertford College.
Group:Keck Institute for Space Studies
Funding AgencyGrant Number
University of OxfordUNSPECIFIED
Dorothy Hodgkin AwardUNSPECIFIED
Keck Institute for Space Studies (KISS)UNSPECIFIED
Commonwealth ScholarshipUNSPECIFIED
Square Kilometer Array South AfricaUNSPECIFIED
Hertford CollegeUNSPECIFIED
Subject Keywords:instrumentation: polarimeters; methods: analytical; techniques: polarimetric techniques: radar astronomy
Issue or Number:2
Record Number:CaltechAUTHORS:20150406-082825217
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Official Citation:O. G. King, Michael E. Jones, C. Copley, R. J. Davis, J. P. Leahy, J. Leech, S. J. C. Muchovej, T. J. Pearson, and Angela C. Taylor Astronomical receiver modelling using scattering matrices MNRAS (January 11, 2015) Vol. 446 1252-1267 doi:10.1093/mnras/stu2172 First published online November 19, 2014
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56365
Deposited By: Tony Diaz
Deposited On:06 Apr 2015 20:11
Last Modified:10 Nov 2021 20:58

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