TL;DR
The paper introduces the FFX correlator, a novel radio astronomy correlation algorithm combining filtering and Fourier transforms, with hardware implementation for high-dispersion, wideband submillimeter observations.
Contribution
It presents a new FFX correlator algorithm and hardware, enabling improved high-dispersion, wideband radio observations in submillimeter astronomy.
Findings
Successful hardware implementation of the FFX correlator
Verification of the FFX scheme through evaluation results
Application potential for the ASTE telescope
Abstract
We established a new algorithm for correlation process in radio astronomy. This scheme consists of the 1st-stage Fourier Transform as a filter and the 2nd-stage Fourier Transform for spectroscopy. The "FFX" correlator stands for Filter and FX architecture, since the 1st-stage Fourier Transform is performed as a digital filter, and the 2nd-stage Fourier Transform is performed as a conventional FX scheme. We developed the FFX correlator hardware not only for the verification of the FFX scheme algorithm but also for the application to the Atacama Submillimeter Telescope Experiment (ASTE) telescope toward high-dispersion and wideband radio observation at submillimeter wavelengths. In this paper, we present the principle of the FFX correlator and its properties, as well as the evaluation results with the production version.
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