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Paper Abstract and Keywords
Presentation 2016-11-25 09:40
Improved ambiguity ratio test in determination of quiet-time ionospheric delay gradients
Jirapoom Budtho, Pornchai Supnithi (KMITL), Susumu Saito (ENRI), Apitep Saekow (Stamford Univ.) SANE2016-85
Abstract (in Japanese) (See Japanese page) 
(in English) The Ground-Based Augmentation System (GBAS) is concerned with the aircraft positioning correction for precision landing. The knowledge of background ionospheric condition is required for GBAS operation at any airport. This paper analyzes the quiet-time ionospheric delay gradients based on the single frequency GPS receiver estimation around the Suvarnabhumi airport, Thailand. Specifically, the ionospheric delay gradients, the single difference (SD) receiver clock error and the SD integer ambiguity are obtained from the Kalman filter and adjusted using the LAMBDA method. After the ratio test procedure, the integer ambiguities and the ionospheric delay gradients become fixed solutions. The results show that 60 percent of data passes the ratio test. To increase the success of the ratio test, the satellite elimination in the LAMBDA method is applied.
Keyword (in Japanese) (See Japanese page) 
(in English) Ionosphere / Single frequency / KALMAN filter / LAMBDA method / Satellite elimination / / /  
Reference Info. IEICE Tech. Rep., vol. 116, no. 319, SANE2016-85, pp. 175-180, Nov. 2016.
Paper # SANE2016-85 
Date of Issue 2016-11-17 (SANE) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
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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 2016-11-24 - 2016-11-25 
Place (in Japanese) (See Japanese page) 
Place (in English) National Taipei University of Technology (NTUT) 
Topics (in Japanese) (See Japanese page) 
Topics (in English) ICSANE2016 
Paper Information
Registration To SANE 
Conference Code 2016-11-SANE 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Improved ambiguity ratio test in determination of quiet-time ionospheric delay gradients 
Sub Title (in English)  
Keyword(1) Ionosphere  
Keyword(2) Single frequency  
Keyword(3) KALMAN filter  
Keyword(4) LAMBDA method  
Keyword(5) Satellite elimination  
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Keyword(7)  
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1st Author's Name Jirapoom Budtho  
1st Author's Affiliation King Mongkut's Institute of Technology Ladkrabang (KMITL)
2nd Author's Name Pornchai Supnithi  
2nd Author's Affiliation King Mongkut's Institute of Technology Ladkrabang (KMITL)
3rd Author's Name Susumu Saito  
3rd Author's Affiliation Electronic Navigation Research Institute (ENRI)
4th Author's Name Apitep Saekow  
4th Author's Affiliation Stamford International University (Stamford Univ.)
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Speaker Author-1 
Date Time 2016-11-25 09:40:00 
Presentation Time 20 minutes 
Registration for SANE 
Paper # SANE2016-85 
Volume (vol) vol.116 
Number (no) no.319 
Page pp.175-180 
#Pages
Date of Issue 2016-11-17 (SANE) 


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