ISSTT Proceedings

ISSTT Proceedings

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Spectrometers for (sub)mm radiometer applications

Authors:
A. Emrich, M. Krus, J. Riesbeck, S. Andersson, M. Hjort
Abstract:
The FFT spectrometer and autocorrelation spectrometers are two of 5 types of spectrometers being considered for spacebased (sub)millimetre heterodyne systems. The advantages of the digital autocorrelation and FFT spectrometers compared to Chirp Transform, Acousto Optical and Filterbank spectrometers are; stability, compactness, high reliability and variability in bandwidth and resolution. FFT spectrometers based on the latest generation of FPGA devices now promise a cost effective alternative for low to medium bandwidth applications with high resolution requirements. Omnisys has an FFT spectrometer design optimized for ground based applications. It follows the single Eurocard standard size and provides up to 2 GHz bandwidth and 1-4 inputs. With four inputs, the maximum processed bandwidth is 500 MHz. Configurations with polyphase filtering, polarization processing and variable resolution over the processed band have also been tested. Omnisys FFT board provides 2 GHz processed bandwidth with a power budget of less than 20W. The next generation will provide 4 GHz of bandwidth per board. For the SuperCAM imaging system, 16 boards will be used in two single height 19" crates to provide 64 spectrometers. It could be upgraded to provide 64 times 1 GHz by simply adding two crates. Test results will be shown in the conference.
Categories:
Backends, Receivers
Year:
2008
Session:
10
Full-text:
Download a PDF of this paper.
Page Number(s):
267