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MWA tied-array processing III: Microsecond time resolution via a polyphase synthesis filter
Publications of the Astronomical Society of Australia ( IF 6.3 ) Pub Date : 2020-08-24 , DOI: 10.1017/pasa.2020.24
S. J. McSweeney , S. M. Ord , D. Kaur , N. D. R. Bhat , B. W. Meyers , S. E. Tremblay , J. Jones , B. Crosse , K. R. Smith

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 ${\sim}$ $0.8\,\upmu$ 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 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.

中文翻译:

MWA 绑定阵列处理 III:通过多相合成滤波器实现微秒时间分辨率

描述了默奇森宽场阵列 (MWA) 的一种新的高时间分辨率观测模式,可实现全极化观测,最高可达 $30.72\,$ MHz的带宽和时间分辨率 ${\sim}$ $0.8\,\upmu$ s。此模式使用多相合成滤波器来“撤消”标准 MWA 电压捕获系统观察模式的多相分析滤波器级。识别和量化高时间分辨率数据重建中的潜在误差源, $S/N$ 背靠背系统引起的损失不超过 $-0.65\,$ 典型噪声为主样本的 dB。通过在微秒时间尺度上观察三个具有已知结构的脉冲星进一步验证了该系统。
更新日期:2020-08-24
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