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We present a filtering technique that can be applied to individual baselinesof wide-bandwidth, wide-field interferometric data to geometrically selectregions on the celestial sphere that contain primary calibration sources. Thetechnique relies on the Fourier transformation of wide-band frequency spectrafrom a given baseline to obtain one-dimensional "delay images", and then thetransformation of a time-series of delay images to obtain two-dimensional"delay/delay-rate images." Source selection is possible in these images givenappropriate combinations of baseline, bandwidth, integration time and sourcelocation. Strong and persistent radio frequency interference (RFI) limits theeffectiveness of this source selection owing to the removal of data by RFIexcision algorithms. A one-dimensional, complex CLEAN algorithm has beendeveloped to compensate for RFI-excision effects. This approach allows CLEANed,source-isolated data to be used to isolate bandpass and primary beam gainfunctions. These techniques are applied to data from the Precision Array forProbing the Epoch of Reionization (PAPER) as a demonstration of their value incalibrating a new generation of low-frequency radio interferometers with widerelative bandwidths and large fields-of-view.

Calibration of Low-Frequency, Wide-Field Radio Interferometers Using Delay/Delay-Rate Filtering