  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.
