MWA Tied-Array Processing I: Calibration and Beamformation

Abstract

The Murchison Widefield Array is a low-frequency Square Kilometre Array precursor located at the Murchison Radio-astronomy Observatory in Western Australia. Primarily designed as an imaging telescope, but with a flexible signal path, the capabilities of this telescope have recently been extended to include off-line incoherent and tied-array beam formation using recorded antenna voltages. This has provided the capability for high-time and frequency resolution observations, including a pulsar science program. This paper describes the algorithms and pipeline that we have developed to form the tied array beam products from the summation of calibrated signals of the antenna elements, and presents example polarimetric profiles for PSRs J0437-4715 and J1900-2600 at 185 MHz.

arXiv comment14 pages, 3 figures, accepted for publication in PASA

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Cited by in corpus (14)

• Science with the Murchison Widefield Array: Phase I Results and Phase II Opportunities
• The frequency-dependent behaviour of subpulse drifting: I. Carousel geometry and emission heights of PSR B0031-07
• Discovery of a steep-spectrum low-luminosity pulsar with the Murchison Widefield Array
• MWA tied-array processing III: Microsecond time resolution via a polyphase synthesis filter
• A high time resolution study of the millisecond pulsar J2241-5236 at frequencies below 300 MHz
• Detection of frequency-dependent dispersion measure toward the millisecond pulsar PSR J2241-5236 from contemporaneous wide-band observations
• High time resolution search for prompt radio emission from the long GRB 210419A with the Murchison Widefield Array
• A targeted search for repeating fast radio bursts with the MWA
• History of Astronomy in Australia: Big-Impact Astronomy from World War II until the Lunar Landing (1945-1969)
• Single-pulse analysis and average emission characteristics of PSR J1820-0427 from observations made with the MWA and uGMRT
• Testing the circularity of PSR B0818-41's carousel
• A Search for Low-frequency Radio Pulses from Long Gamma-ray Bursts with the Murchison Widefield Array
• Independent discovery of a nulling pulsar with unusual sub-pulse drifting properties with the Murchison Widefield Array
• Direct Wide-Field Radio Imaging in Real-Time at High Time Resolution using Antenna Electric Fields