MWA捆绑阵列处理III：通过多相合成滤波器实现微秒级时间分辨率
MWA tied-array processing III: Microsecond time resolution via a polyphase synthesis filter
摘要：
本文介绍了一种新的Murchison宽场阵列（MWA）高时间分辨率观测模式，它能实现带宽达30.72 MHz、时间分辨率约为0.8 $μ$ s的全极化观测。该模式利用多相合成滤波器来“撤消”标准MWA的电压捕获系统（VCO）观测模式的多相分析滤波器阶段。识别和量化了高时间分辨率数据重建中的潜在误差源，对于典型的噪声主导样本，背靠背系统引起的S/N损失不超过-0.65 dB。通过对三颗已知结构的双星在微秒级时间尺度上的观测，进一步验证了该系统的有效性。
英文摘要：
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 $μ$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.
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