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Wideband Spectroscopy: The Design and Implementation of a 3 GHz, 2048 Channel Digital SpectrometerA state-of-the-art digital Fourier Transform spectrometer has been developed, with a combination of high bandwidth and fine resolution unavailable elsewhere. Analog signals consisting of radiation emitted by constituents in planetary atmospheres or galactic sources are downconverted and subsequently digitized by a pair of interleaved Analog-to-Digital Converters (ADC). This 6 Gsps (giga sample per second) digital representation of the analog signal is then processed through an FPGA-based streaming Fast Fourier Transform (FFT), the key development described below. Digital spectrometers have many advantages over previously used analog spectrometers, especially in terms of accuracy and resolution, both of which are particularly important for the type of scientific questions to be addressed with next-generation radiometers. The implementation, results and underlying math for this spectrometer, as well as potential for future extension to even higher bandwidth, resolution and channel orthogonality, needed to support proposed future advanced atmospheric science and radioastronomy, are discussed.
Document ID
20150006102
Acquisition Source
Jet Propulsion Laboratory
Document Type
Other
External Source(s)
Authors
Monroe, Ryan M.
(Georgia Inst. of Tech. Atlanta, GA, United States)
Date Acquired
April 22, 2015
Publication Date
August 1, 2011
Subject Category
Instrumentation And Photography
Meteorology And Climatology
Electronics And Electrical Engineering
Distribution Limits
Public
Copyright
Other
Keywords
field programmable gate array
digital spectrometer
wideband DSP

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