1996 Fiscal Year Final Research Report Summary
Research on Synthetic Aperture FM-CW Imaging Radar Utilizing Polarimetry
| Project/Area Number |
07650479
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
計測・制御工学
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| Research Institution | Niigata University |
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Principal Investigator |
YAMAGUCHI Yoshio Niigata University, Faculty of Engineering, Professor, 工学部, 教授 (50115086)
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| Project Period (FY) |
1995 – 1996
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| Keywords | radar polarimetry / FM-CW radar / imaging radar / イメージング |
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| Research Abstract |
This research aimed at developing a full polarmetric and 2-dimensional synthetic aperture FM-CW imaging radar. The main purpose of this research was to introduce the principle of radar polarimetry into a wide-band FM-CW radar imaging. The radar polarimetry is a full utilization of the vector nature of the electromagnetic waves in radar remote sensing. The radar polarimetry has been well established for the monochromatic wave case, however, there still remains a question how to incorporate it into a wide band radar signal for the case of FM-CW radar. We pointed out in this research that the beat spectrum obtained in the FM-CW radar system could be replaced as a scattering matrix element which plays an important role in radar polarimetry principle. Since the beat spectrum after synthetic aperture signal processing has a complex amplitude (magnitude and phase) bearing polarimetric target information, it represents scattering characteristics of a target depending upon polarization. The value is evaluated at the center frequency of a swept frequency measurement. The authors investigated the transformation of scattering matrix in arbitrary polarization basis, which resulted in the derivation of the characteristic polarization states specific to a target, and polarimetric enhanced image against clutter. Using linear polarization basis configuration radar placed in a laboratory, several targets such as plate, dihedral corner reflector and wire, air-plane model were imaged to retrieve information from the scattering matrices. It was confirmed that the FM-CW radar acts as a novel, full polarimetric, high resolution, and revolutionary imaging radar system.
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