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Observation of redshifted 21-cm signal from the Epoch of Reionization (EoR)is challenging due to contamination from the bright foreground sources thatexceed the signal by several orders of magnitude. The removal of this very highforeground relies on accurate calibration to keep the intrinsic property of theforeground with frequency. Commonly employed calibration techniques for theseexperiments are the sky model-based and the redundant baseline-basedcalibration approaches. However, the sky model-based and redundantbaseline-based calibration methods could suffer from sky-modeling error andarray redundancy imperfection issues, respectively. In this work, we introducethe hybrid correlation calibration ("CorrCal") scheme, which aims to bridge thegap between redundant and sky-based calibration by relaxing redundancy of thearray and including sky information into the calibration formalisms. Wedemonstrate the slight improvement of power spectra, about $-6\%$ deviation atthe bin right on the horizon limit of the foreground wedge-like structure,relative to the power spectra before the implementation of "CorrCal" to thedata from the Precision Array for Probing the Epoch of Reionization (PAPER)experiment, which was otherwise calibrated using redundant baselinecalibration. This small improvement of the foreground power spectra around thewedge limit could be suggestive of reduced spectral structure in the data after"CorrCal" calibration, which lays the foundation for future improvement of thecalibration algorithm and implementation method.

The Correlation Calibration of PAPER-64 data