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Paper Abstract and Keywords
Presentation 2010-11-26 14:25
Measurements and characterization of ultra wideband radio propagation channels and transmission thoroughputs within small Spacecrafts
Tatsuya Ichikawa, Akihisa Matsubara (TDU), Atsushi Tomiki, Tomoaki Toda (JAXA), Takehiko Kobayashi (TDU) SANE2010-120
Abstract (in Japanese) (See Japanese page) 
(in English) The replacement of wired data buses among space-borne subsystems with wireless connections enhances onboard component layouts, reduces a connecting cable mass, and enables higher-speed data bus connections. We have proposed to apply Ultra Wideband (UWB) technologies to a spacecraft inner closed space filled with bus and science instruments. While narrowband resulted in a number of dead spots (deep fading points) within the conductive enclosures like inside of spacecraft, UWB yielded none. This implies the UWB systems have an advantage over narrowband ones from a viewpoint of reducing fading margins. We measured spatial distributions of UWB and narrowband propagation in frequency (from 3.1 to 10.6 GHz) and time domains with a mockup of REIMEI satellite, UWB monopole antennas, and a microwave vector network analyzer. We also investigated spatial distributions of data throughputs inside REIMEI using commercially available UWB devices. The influences of polarization of UWB antennas on the above propagation and throughputs characteristics have also been evaluated for this report. They are so small and limited that the polarization is not a factor needing careful wireless link designs and layout considerations.
Keyword (in Japanese) (See Japanese page) 
(in English) Ultra wideband / small Spacecraft / Propagation / Harnessless / / / /  
Reference Info. IEICE Tech. Rep., vol. 110, no. 308, SANE2010-120, pp. 19-24, Nov. 2010.
Paper # SANE2010-120 
Date of Issue 2010-11-19 (SANE) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
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)
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Conference Information
Committee SANE  
Conference Date 2010-11-26 - 2010-11-26 
Place (in Japanese) (See Japanese page) 
Place (in English) JAXA Sagamihara campus 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Astronautical mission, satellite technology, and general 
Paper Information
Registration To SANE 
Conference Code 2010-11-SANE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Measurements and characterization of ultra wideband radio propagation channels and transmission thoroughputs within small Spacecrafts 
Sub Title (in English)  
Keyword(1) Ultra wideband  
Keyword(2) small Spacecraft  
Keyword(3) Propagation  
Keyword(4) Harnessless  
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1st Author's Name Tatsuya Ichikawa  
1st Author's Affiliation Tokyo Denki University (TDU)
2nd Author's Name Akihisa Matsubara  
2nd Author's Affiliation Tokyo Denki University (TDU)
3rd Author's Name Atsushi Tomiki  
3rd Author's Affiliation Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science (JAXA)
4th Author's Name Tomoaki Toda  
4th Author's Affiliation Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science (JAXA)
5th Author's Name Takehiko Kobayashi  
5th Author's Affiliation Tokyo Denki University (TDU)
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Speaker Author-1 
Date Time 2010-11-26 14:25:00 
Presentation Time 25 minutes 
Registration for SANE 
Paper # SANE2010-120 
Volume (vol) vol.110 
Number (no) no.308 
Page pp.19-24 
#Pages 6 
Date of Issue 2010-11-19 (SANE) 

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