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| Presentation | 2021-05-13 11:30 [Invited Talk] RCS Evaluation by Electromagnetic Near-field to Far-field Transformation Hirokazu Kobayashi (EM System Lab)  SANE2021-4 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | In this paper, we discuss the near-field to far-field transformation (NFFFT) theory for radar cross-section (RCS) of an electrically large object, that is a comprehensive review of the author's published articles over the past 10 years. When an electrical size of the object under test is large such as airplane, the probe antenna that measures scattered waves from the object has to be placed sufficiently far from the object in order to illuminate plane wave that is the measurement premise. Assuming a measurement frequency is f and a maximum size of the object is D, this distance R is generally evaluated by R>2D^2/λ(fλ=c, where λ: wavelength, c: speed of light). For example, when D=3m and f=10GHz, R=600m is an unrealistic condition. Therefore, it is conceivable to acquire scattered field near the object by some method and theoretically transform it into a far-region. As our approach, if a radar image based on scattered waves from the object is obtained, it is considered that a far-field generated by source can be evaluated by regarding the image as a secondary wave source. Based on this concept, the relationship between radar image and three-dimensional RCS can be derived. The theoretical validity is proved through the numerical calculations and the comparative examination using actual measurement data. Above all, It was found as interesting result that the unnecessary waves can be suppressed by properly processing the images containing the unnecessary waves. Through this confirmation, it is proved the equivalence of the time-axis processing such as the fast Fourier transform (FFT) and this spatial-axis processing in the image data. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | near-field to far-field transformation / radar cross-section (RCS) / radar imaging / inverse synthetic aperture radar (ISAR) / focusing / circular/cylindrical scanning / antenna near-field transformation / equivalence of time and space-domain | |
| Reference Info. | IEICE Tech. Rep., vol. 121, no. 16, SANE2021-4, pp. 15-26, May 2021. | |
| Paper # | SANE2021-4 | |
| Date of Issue | 2021-05-06 (SANE) | |
| ISSN | 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 | SANE2021-4 |
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| Conference Information | |
| Committee | SANE |
| Conference Date | 2021-05-13 - 2021-05-13 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Radar, EW and generals |
| Paper Information | |
| Registration To | SANE |
| Conference Code | 2021-05-SANE |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | RCS Evaluation by Electromagnetic Near-field to Far-field Transformation |
| Sub Title (in English) | |
| Keyword(1) | near-field to far-field transformation |
| Keyword(2) | radar cross-section (RCS) |
| Keyword(3) | radar imaging |
| Keyword(4) | inverse synthetic aperture radar (ISAR) |
| Keyword(5) | focusing |
| Keyword(6) | circular/cylindrical scanning |
| Keyword(7) | antenna near-field transformation |
| Keyword(8) | equivalence of time and space-domain |
| 1st Author's Name | Hirokazu Kobayashi |
| 1st Author's Affiliation | Electromagnetic Wave System Laboratory (EM System Lab) |
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| Speaker | Author-1 |
| Date Time | 2021-05-13 11:30:00 |
| Presentation Time | 50 minutes |
| Registration for | SANE |
| Paper # | SANE2021-4 |
| Volume (vol) | vol.121 |
| Number (no) | no.16 |
| Page | pp.15-26 |
| #Pages | 12 |
| Date of Issue | 2021-05-06 (SANE) |
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