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Paper Abstract and Keywords
Presentation 2015-01-29 15:05
An AWF Digital Spectrometer for a Radio Telescope
Hiroki Nakahara (Ehime Univ.), Hiroyuki Nakanishi (Kagoshima Univ.), Kazumasa Iwai (NAOJ) VLD2014-122 CPSY2014-131 RECONF2014-55
Abstract (in Japanese) (See Japanese page) 
(in English) A radio telescope analyzes radio frequency~(RF) received from celestial objects.
It consists of an antenna, a receiver, and a spectrometer.
The spectrometer converts the time domain into the frequency domain by a FFT operation.
In the spectrometer, first, it multiples the window coefficient to the received signal.
Second, it applies the FFT operation.
Third, it converts to the absolute of a complex number.
Finally, to reduce the noise, it accumulates obtained power spectrum.
We call this a WFA spectrometer.
Since an AD converter is faster than the FPGA, a parallel FFT computation is desired.
However, since the amount of hardware for the FFT becomes bottleneck,
the conventional WFA does not realized the high-performance analysis.
This paper proposes an AWF spectrometer which replaces the order of operations.
Since the AWF spectrometer reduces the parallelism of the FFT,
it is smaller than the conventional WFA spectrometer.
Also, the paper proposes a off-chip memory realization which is highly efficient use of the FPGA.
Experimental results show that the proposed AWF spectrometer outperforms conventional spectrometers.
Keyword (in Japanese) (See Japanese page) 
(in English) Radio Telescope / Spectrometer / FFT / FPGA / / / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 428, RECONF2014-55, pp. 67-72, Jan. 2015.
Paper # RECONF2014-55 
Date of Issue 2015-01-22 (VLD, CPSY, RECONF) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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reproduction
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF VLD2014-122 CPSY2014-131 RECONF2014-55

Conference Information
Committee RECONF CPSY VLD IPSJ-SLDM  
Conference Date 2015-01-29 - 2015-01-30 
Place (in Japanese) (See Japanese page) 
Place (in English) Hiyoshi Campus, Keio University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) FPGA Applications, etc 
Paper Information
Registration To RECONF 
Conference Code 2015-01-RECONF-CPSY-VLD-SLDM 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) An AWF Digital Spectrometer for a Radio Telescope 
Sub Title (in English)  
Keyword(1) Radio Telescope  
Keyword(2) Spectrometer  
Keyword(3) FFT  
Keyword(4) FPGA  
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1st Author's Name Hiroki Nakahara  
1st Author's Affiliation Ehime University (Ehime Univ.)
2nd Author's Name Hiroyuki Nakanishi  
2nd Author's Affiliation Kagoshima University (Kagoshima Univ.)
3rd Author's Name Kazumasa Iwai  
3rd Author's Affiliation National Astronomical Observatory of Japan (NAOJ)
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Speaker Author-1 
Date Time 2015-01-29 15:05:00 
Presentation Time 20 minutes 
Registration for RECONF 
Paper # VLD2014-122, CPSY2014-131, RECONF2014-55 
Volume (vol) vol.114 
Number (no) no.426(VLD), no.427(CPSY), no.428(RECONF) 
Page pp.67-72 
#Pages
Date of Issue 2015-01-22 (VLD, CPSY, RECONF) 


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