Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/alfa/galfa/meetings/1/talks/psrlong_files/text13.htm
Дата изменения: Tue May 6 07:24:36 2003
Дата индексирования: Sun Dec 23 06:34:38 2007
Кодировка:

Spectrometer Requirements First page Back Continue Last page Summary Graphics

Spectrometer Requirements

Input to spectrometer (FPGA based):
- 7 beams x 2 polarizations x 300 MHz
- ³ 8 bit samples

Output to disk:

1024 spectral channels (Þ 0.3 MHz)
Spectral normalization (Sn / áSnñ - 1)
Polarizations summed
Selectable output bits (2, 4, 8 …)
64 ms dump times

Desirable features:

Selectable polyphase filter shapes
Selectable number of channels
Subbanding (~100 MHz, variable overlap)
Selectable dumptimes (e.g. 4-256 ms)

Spectrometer Requirements

Input to spectrometer (FPGA based):

Output to disk:

Desirable features:

Notes: