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Paper Abstract and Keywords
Presentation 2017-01-19 13:20
Estimation of Changes in Cross-Polarization Discrimination of Ka-band Satellite Communication Signals due to Lightning Discharges
Yasuyuki Maekawa (Osaka Electro-Commun, Univ.) AP2016-131
Abstract (in Japanese) (See Japanese page) 
(in English) Rapid changes in cross-polarization discrimination (XPD) of Ka-band satellite radio wave caused by thunder- storm events are presented using the beacon signal (19.45GHz, right-hand circular polarization) of CS-3 and N-Star observed at 1 sec interval in Osaka Electro-Communication University, Neyagawa, Osaka, from 1990 to 2006. According to the previous C-band low elevation angle observations conducted by the international satellite communications links, almost all rapid changes in XPD showed decreases of XPD values, indicating increases in depolarization of propagation medium. In the present Ka-band high elevation angle observations, however, considerable amount of rapid changes in XPD shows increases of XPD values, meaning increases of depolarization. The XPD values and the canting angles of ice crystals associated with cross-polar phases are directly estimated at the location of lightning discharges using the observed XPD and cross-polar phases before and after the rapid changes. As a result, the canting angles of ice crystals are shown to be centered around 90°and aligned in almost perpendicular direction, while the XPD values are widely distributed in 20-50 dB. This phenomenon is consistent with the feature of thundercloud structure and can quantitatively explain increase and decrease of the observed rapid XPD changes.
Keyword (in Japanese) (See Japanese page) 
(in English) Satellite communications / Ka-band / Cross-polarization discrimination / Cross-polar phase / Lightning discharge / Rapid changes / Ice crystals / Canting angles  
Reference Info. IEICE Tech. Rep., vol. 116, no. 397, AP2016-131, pp. 13-16, Jan. 2017.
Paper # AP2016-131 
Date of Issue 2017-01-12 (AP) 
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)
Download PDF AP2016-131

Conference Information
Committee AP WPT  
Conference Date 2017-01-19 - 2017-01-20 
Place (in Japanese) (See Japanese page) 
Place (in English) Hiroshima Institute of Technology 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Wireless transmission technology, Radio propagation, Antennas and Propagation 
Paper Information
Registration To AP 
Conference Code 2017-01-AP-WPT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Estimation of Changes in Cross-Polarization Discrimination of Ka-band Satellite Communication Signals due to Lightning Discharges 
Sub Title (in English)  
Keyword(1) Satellite communications  
Keyword(2) Ka-band  
Keyword(3) Cross-polarization discrimination  
Keyword(4) Cross-polar phase  
Keyword(5) Lightning discharge  
Keyword(6) Rapid changes  
Keyword(7) Ice crystals  
Keyword(8) Canting angles  
1st Author's Name Yasuyuki Maekawa  
1st Author's Affiliation Osaka Electro-Communication University (Osaka Electro-Commun, Univ.)
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Speaker Author-1 
Date Time 2017-01-19 13:20:00 
Presentation Time 20 minutes 
Registration for AP 
Paper # AP2016-131 
Volume (vol) vol.116 
Number (no) no.397 
Page pp.13-16 
#Pages 4 
Date of Issue 2017-01-12 (AP) 

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