MWA tied-array processing III: Microsecond time resolution via a polyphase synthesis filter

Abstract

A new high time resolution observing mode for the Murchison Widefield Array (MWA) is described, enabling full polarimetric observations with up to 30.72 MHz of bandwidth and a time resolution of ~0.8 $\mu$s. This mode makes use of a polyphase synthesis filter to "undo" the polyphase analysis filter stage of the standard MWA's Voltage Capture System (VCS) observing mode. Sources of potential error in the reconstruction of the high time resolution data are identified and quantified, with the S/N loss induced by the back-to-back system not exceeding -0.65 dB for typical noise-dominated samples. The system is further verified by observing three pulsars with known structure on microsecond timescales.

Accepted for publication in PASA

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Cited by in corpus (4)

• Discovery of a steep-spectrum low-luminosity pulsar with the Murchison Widefield Array
• Evidence of Ultra-faint Radio Frequency Interference in Deep 21~cm Epoch of Reionization Power Spectra with the Murchison Widefield Array
• Establishing the Capabilities of the Murchison Widefield Array as a Passive Radar for the Surveillance of Space
• Independent discovery of a nulling pulsar with unusual sub-pulse drifting properties with the Murchison Widefield Array