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- W2070067564 abstract "The knowledge of receiver beam shapes is essential for accurate radio interferometric imaging. Traditionally, this information is obtained by holographic techniques or by numerical simulation. However, such methods are not feasible for an observation with time varying beams, such as the beams produced by a phased array radio interferometer. We propose the use of the observed data itself for the estimation of the beam shapes. We use the directional gains obtained along multiple sources across the sky for the construction of a time varying beam model. The construction of this model is an ill posed non linear optimization problem. Therefore, we propose to use Riemannian optimization, where we consider the constraints imposed as a manifold.We compare the performance of the proposed approach with traditional unconstrained optimization and give results to show the superiority of the proposed approach." @default.
- W2070067564 created "2016-06-24" @default.
- W2070067564 creator A5075439666 @default.
- W2070067564 date "2012-06-01" @default.
- W2070067564 modified "2023-09-26" @default.
- W2070067564 title "Estimation of radio interferometer beam shapes using riemannian optimization" @default.
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- W2070067564 doi "https://doi.org/10.1109/sam.2012.6250556" @default.
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