English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We propose an eigenvector-based formalism for the calibration of radiointerferometer arrays. In the presence of a strong dominant point source, thecomplex gains of the array can be obtained by taking the first eigenvector ofthe visibility matrix. We use the stable principle component analysis (SPCA)method to help separate outliers and noise from the calibrator signal toimprove the performance of the method. This method can be applied with poorlyknown beam model of the antenna, and is insensitive to outliers orimperfections in the data, and has low computational complexity. It thus isparticularly suitable for the initial calibration of the array, which can serveas the initial point for more accurate calibrations. We demonstrate this methodby applying it to the cylinder pathfinder of the Tianlai experiment, which aimsto measure the dark energy equation of state using the baryon acousticoscillation (BAO) features in the large scale structure by making intensitymapping observation of the redshifted 21~cm emission of the neutral hydrogen(HI). The complex gain of the array elements and the beam profile in theEast-West direction (short axis of the cylinder) are successfully obtained byapplying this method to the transit data of bright radio sources.

An Eigenvector-based Method of Radio Array Calibration and Its Application to the Tianlai Cylinder Pathfinder