Paper Abstract and Keywords |
Presentation |
2016-07-21 15:15
Estimation for the number of collision packets in the space-based AIS Takanori Kanzawa, Kazuhiko Fukawa (TokyoTech), Daichi Hirahara (JAXA) SAT2016-20 |
Abstract |
(in Japanese) |
(See Japanese page) |
(in English) |
Automatic Identification System (AIS) information can be obtained across the open sea by the space-based AIS. In Japan, JAXA has conducted a space-based AIS experiment, which is called space-based AIS experiment (SPAISE). In this experiment, satellites equipped with AIS receivers have been launched to altitude 600km and receive AIS signals suffering from Doppler shift. The experiment results clarify that the wide coverage of the satellite causes collision of many AIS signal packets, which makes signal detection very hard. In order to estimate the number of collision packets for separating and detecting the collision packets, this report proposes an estimation method exploiting correlation between received signals and the training sequence. The phase of the training sequence is rotated by candidates of the Doppler frequency and then received timing is delayed by candidates of delayed time. Then, the correlation between the resultant training sequences and the received signals is calculated. By searching for the highest peak of the correlation, we can estimate the Doppler frequency and delayed time of the dominant AIS packet. The training sequence with the estimated Doppler frequency and delayed time is subtracted from the received signals. The correlation between the resultant received signals and training sequence is calculated again. These processes are repeated until the peak of the correlation does not exceed a threshold, which can estimate the number of collision packets. Computer simulations evaluate mean squared estimation errors of the Doppler frequency, the delay time, and the complex envelope, and show that when the average received power of each packet is equal, how the error rate of the number of collision packets depends on the average signal to noise ratio. Especially, it is demonstrated that the error detection rate becomes approximately 45% when the number of collision packets is 4, 20 % for 3, and 5% for 2. |
Keyword |
(in Japanese) |
(See Japanese page) |
(in English) |
Automatic Identification System (AIS) / SPAISE / collision packet number / correlation detection / / / / |
Reference Info. |
IEICE Tech. Rep., vol. 116, no. 144, SAT2016-20, pp. 51-56, July 2016. |
Paper # |
SAT2016-20 |
Date of Issue |
2016-07-14 (SAT) |
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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SAT2016-20 |
Conference Information |
Committee |
AP SAT SANE |
Conference Date |
2016-07-20 - 2016-07-22 |
Place (in Japanese) |
(See Japanese page) |
Place (in English) |
Otaru port marina |
Topics (in Japanese) |
(See Japanese page) |
Topics (in English) |
Remote sensing, Radio propagation, Antennas and Propagation, Sattelite Communication |
Paper Information |
Registration To |
SAT |
Conference Code |
2016-07-AP-SAT-SANE |
Language |
Japanese |
Title (in Japanese) |
(See Japanese page) |
Sub Title (in Japanese) |
(See Japanese page) |
Title (in English) |
Estimation for the number of collision packets in the space-based AIS |
Sub Title (in English) |
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Keyword(1) |
Automatic Identification System (AIS) |
Keyword(2) |
SPAISE |
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collision packet number |
Keyword(4) |
correlation detection |
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1st Author's Name |
Takanori Kanzawa |
1st Author's Affiliation |
Tokyo Institute of Technology (TokyoTech) |
2nd Author's Name |
Kazuhiko Fukawa |
2nd Author's Affiliation |
Tokyo Institute of Technology (TokyoTech) |
3rd Author's Name |
Daichi Hirahara |
3rd Author's Affiliation |
Japan Aerospace Exploration Agency (JAXA) |
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Speaker |
Author-1 |
Date Time |
2016-07-21 15:15:00 |
Presentation Time |
25 minutes |
Registration for |
SAT |
Paper # |
SAT2016-20 |
Volume (vol) |
vol.116 |
Number (no) |
no.144 |
Page |
pp.51-56 |
#Pages |
6 |
Date of Issue |
2016-07-14 (SAT) |
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