论文标题
低频孔径阵列的信号处理固件
Signal Processing Firmware for the Low Frequency Aperture Array
论文作者
论文摘要
描述了已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。该固件是在双重FPGA板上实施的，该木板能够处理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通道化，对仪器响应的校正以及几何延迟和形成一个或多个光束，通过组合对齐的流。 Channelizer使用过度采样多相过滤库架构，从而允许在光谱通道之间没有不连续性的输入信号进行频率连续处理。每个董事会通过标准以太网互连链接的较大光束成型系统的一部分，从16个天线处理流的流。设想在平方公里阵列的第一阶段中有8192个这些信号处理平台，因此已特别注意以确保设计是低成本和低功率。
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.
