UWB Radar for through Foliage Imaging using Cyclic Prefix-based OFDM

TL;DR

This paper introduces a CP-based OFDM SAR technique for foliage penetration imaging that reduces sidelobe interference caused by foliage, improving target visibility in radar images.

Contribution

It demonstrates the effectiveness of cyclic prefix-based OFDM SAR in foliage penetration, reducing sidelobe levels and enhancing image quality compared to traditional methods.

Findings

ISLR is 2 dB lower than noise signals in foliage conditions

Peak sidelobe levels are comparable to traditional signals

Improved imaging through foliage with reduced interference

Abstract

This paper proposes the use of sufficient cyclic prefix (CP) OFDM synthetic aperture radar (SAR) for foliage penetration (FOPEN). The foliage introduces phase and amplitude fluctuation which cause the sidelobes to increase and affects the final image of the obscured targets. The wideband CP-based OFDM SAR inherently eliminates the sidelobes that arise from the interference between targets on the same range line. The integrated sidelobe level ratio (ISLR) of the CP-based OFDM signal along the range direction is lower than that of the random noise signal by 2 dB for foliage penetration application, while the peak sidelobe level ratio (PSLR) are almost the same of both of the two signals.