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arXiv 2002.10307astro-ph.IMphysics.ins-det
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低频孔径阵列信号处理固件

Signal Processing Firmware for the Low Frequency Aperture Array

Gianni Comoretto, Riccardo Chiello, Matt Roberts, Rob Halsall, Kristian Zarb Adami, Monica Alderighi, Amin Aminaei, Jeremy Baker, Carolina Belli, Simone Chiaruc… 展开作者

Gianni Comoretto, Riccardo Chiello, Matt Roberts, Rob Halsall, Kristian Zarb Adami, Monica Alderighi, Amin Aminaei, Jeremy Baker, Carolina Belli, Simone Chiarucci, Sergio D'Angelo, Andrea De Marco, Gabriele Dalle Mura, Alessio Magro, Andrea Mattana, Jader Monari, Giovanni Naldi, Sandro Pastore, Federico Perini, Marco Poloni, Giuseppe Pupillo, Simone Rusticelli, Marco Schiaffino, Francesco Schillirò, Emanuele Zaccaro

摘要:

介绍了为平方公里阵列的低频孔径阵列组件开发的信号处理固件。固件在双FPGA板上实现,能够处理来自16个双极化天线的流。数据处理包括每个天线的采样数据的信道化,仪器响应和几何延迟的校正,以及通过组合对齐的流形成一个或多个波束。该信道化器采用过采样多相滤波器组架构,允许对输入信号进行频率连续处理,而频谱通道之间没有不连续性。每个板处理来自16个天线的数据流,作为更大的波束成形系统的一部分,通过标准以太网互连连接。在平方公里阵列的第一阶段,预计将有8192个这样的信号处理平台,因此特别注意确保设计是低成本和低功耗的。

英文摘要:

The signal processing firmware that has been developed for the Low Frequency Aperture Array component of the Square Kilometre Array is described. The firmware is implemented on a dual FPGA board, that is capable of processing the streams from 16 dual polarization antennas. Data processing includes channelization of the sampled data for each antenna, correction for instrumental response and for geometric delays and formation of one or more beams by combining the aligned streams. The channelizer uses an oversampling polyphase filterbank architecture, allowing a frequency continuous processing of the input signal without discontinuities between spectral channels. Each board processes the streams from 16 antennas, as part of larger beamforming system, linked by standard Ethernet interconnections. There are envisaged to be 8192 of these signal processing platforms in the first phase of the Square Kilometre array so particular attention has been devoted to ensure the design is low cost and low power.

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