An Active Reflector for SAR Calibration Having a Frequency Shift Capability

Masaharu FUJITA  

IEICE TRANSACTIONS on Communications   Vol.E75-B   No.8   pp.791-793
Publication Date: 1992/08/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Radio Communication
SAR,  calibration,  point target,  frequency shift,  image shift,  

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This letter proposes an active reflector for calibrating a synthetic aperture radar (SAR), in which the frequency of a received SAR signal is shifted by a certain amount and then it is retransmitted to the SAR. The frequency shift causes a shift of the reflector SAR image in an azimuth direction relative to its background. This function would allow to enhance a signal-to-clutter ratio of the reflector image by moving it onto a radiometrically dark background, and hence it would be of value for SAR calibration even in a narrow test site. The theory, design and development are described briefly.