期刊
ASTRONOMY & ASTROPHYSICS
卷 442, 期 2, 页码 767-773出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20053568
关键词
instrumentation : spectrographs; methods : observational; techniques : spectroscopic; submillimeter; radio lines : stars; radio lines : general
The core architecture, tests in the lab and first results of a Fast Fourier Transform (FFT) spectrometer are described. It is based on a commercially available fast digital sampler (AC240) with an on-board Field Programmable Gate Array (FPGA). The spectrometer works continuously and has a remarkable total bandwidth of 1 GHz, resolved into 16 384 channels. The data is sampled with 8 bits, yielding a dynamic range of 48 dB. An Allan time of more than 2000 s and an SFDR of 37 dB were measured. First light observations with the KOSMA telescope show a perfect spectrum without internal or external spurious signals.
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