Abstract
One key problem in forward-looking synthetic aperture radar (SAR) imaging is that symmetrical targets along the flight path have the same Doppler history, this paper proposes a new forward-looking SAR imaging by the use of frequency diverse array (FDA) antenna. Different from conventional phased-array and multiple-input multiple-output (MIMO) antennas, which provide angle-dependent only transmit beampattern, the FDA offers range-angle dependent transmit beampattern and thus, the serious azimuth ambiguity in conventional forward-looking SAR imaging can be resolved by exploiting FDA range-angle dependent beampattern. Moreover, multicarrier transmission is also employed in the FDA radar to decouple the range and angle response of the targets. The effectiveness of the proposed methods are validated by simulation results.
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