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arXiv 1111.2770astro-ph.IM
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阿塔卡玛大型毫米/亚毫米波阵的阿塔卡玛紧凑阵数字谱关联函数系统

Digital Spectro-Correlator System for the Atacama Compact Array of the Atacama Large Millimeter/submillimeter Array

T. Kamazaki, S. K. Okumura, Y. Chikada, T. Okuda, Y. Kurono, S. Iguchi, S. Mitsuishi, Y. Murakami, N. Nishimuta, H. Mita, R. Sano

摘要:

我们已经开发了一个FX架构的数字光谱相关器的阿塔卡马紧凑阵列(ACA)的阿塔卡马大型毫米/亚毫米阵列。该关联函数能够同时处理4对带宽为2 GHz的双极化信号,这些信号由多达16根天线接收。它可以计算自相关谱和互相关谱,包括所有天线的所有组合中的交叉极化,并输出具有灵活频谱配置的相关谱,例如多个频率范围和多个频率分辨率。用典型的关联函数结构对热噪声进行了8小时的处理,估计其光谱动态范围相对于Tsys大于10^4。在相同的结构下,灵敏度损失为0.9%.在本文中,我们报告的关联函数的详细设计和开发的硬件验证结果。

英文摘要:

We have developed an FX-architecture digital spectro-correlator for the Atacama Compact Array (ACA) of the Atacama Large Millimeter/submillimeter Array. The correlator is able to simultaneously process four pairs of dual polarization signals with the bandwidth of 2 GHz, which are received by up to sixteen antennas. It can calculate auto- and cross-correlation spectra including cross-polarization in all combinations of all the antennas, and output correlation spectra with flexible spectral configuration such as multiple frequency ranges and multiple frequency resolutions. Its spectral dynamic range is estimated to be higher than 10^4 relative to Tsys from processing results of thermal noise for eight hours with a typical correlator configuration. The sensitivity loss is also confirmed to be 0.9 % with the same configuration. In this paper, we report the detailed design of the correlator and the verification results of the developed hardware.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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