IEICE Technical Committee Submission System
Conference Paper's Information
Online Proceedings
[Sign in]
Tech. Rep. Archives
 Go Top Page Go Previous   [Japanese] / [English] 

Paper Abstract and Keywords
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
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
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

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)
2nd Author's Name  
2nd Author's Affiliation ()
3rd Author's Name  
3rd Author's Affiliation ()
4th Author's Name  
4th Author's Affiliation ()
5th Author's Name  
5th Author's Affiliation ()
6th Author's Name  
6th Author's Affiliation ()
7th Author's Name  
7th Author's Affiliation ()
8th Author's Name  
8th Author's Affiliation ()
9th Author's Name  
9th Author's Affiliation ()
10th Author's Name  
10th Author's Affiliation ()
11th Author's Name  
11th Author's Affiliation ()
12th Author's Name  
12th Author's Affiliation ()
13th Author's Name  
13th Author's Affiliation ()
14th Author's Name  
14th Author's Affiliation ()
15th Author's Name  
15th Author's Affiliation ()
16th Author's Name  
16th Author's Affiliation ()
17th Author's Name  
17th Author's Affiliation ()
18th Author's Name  
18th Author's Affiliation ()
19th Author's Name  
19th Author's Affiliation ()
20th Author's Name  
20th Author's Affiliation ()
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) 

[Return to Top Page]

[Return to IEICE Web Page]

The Institute of Electronics, Information and Communication Engineers (IEICE), Japan