A novel circularly polarized synthetic aperture radar (CP-SAR) system onboard a spaceborne platform
For decades, linearly polarized synthetic aperture radar (LP-SAR) systems have been used in spaceborne platforms. In the transmitting and receiving processes, Faraday rotation in the ionosphere often affects the LP signals, leading to degradation in the backscatter signature in SAR images as well as loss of available power. Although the use of circular polarization can provide a solution to the Faraday rotation problem in many microwave systems, it has not previously been applied to SAR systems. In this paper, we describe the novel concept of a spaceborne (especially small-satellite) SAR system based on circular polarization, and show that a smaller antenna size, lower transmitted peak power and high precision signal reconstruction can be achieved by the proposed circularly polarized (CP)-SAR system.
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Document Type: Research Article
Affiliations: Centre for Environmental Remote Sensing (CEReS), Chiba University, Chiba, Japan
Publication date: 01 April 2010