Development of L-band Circularly Polarized Synthetic Aperture Radar System

Yuta Izumi, Zafri Bin Baharuddin, Heein Yang, Hendra Agus, Josaphat Tetuko Sri Sumantyo


Synthetic aperture radar (SAR) is an imaging radar that uses the radio frequency (RF) signals. Conventional space-borne SAR employs linearly polarized (LP) RF signals and it is easily affected by Faraday rotation effect that distorts the signal amplitude as the signal traverses Ionosphere. This paper presents the development of SAR system that adopts circularly polarized (CP) antennas to compensate the Faraday rotation effect. The inverse SAR (ISAR) test using point target has been conducted in anechoic chamber to validate the performance of the proposed CP-SAR system. The peak to side-lobe ratio (PSLR) parameter from the point target image shows the characteristic of CP microwave. In case of surface scattering, the cross-polarization shows approximately -6 dB lowered PSLR than co-polarization. On the other hand, the double-scattering of co-polarization shows -7 dB lowered PSLR when compared to that of cross-polarization.

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