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In this paper, we analyze Dual-Channel Displaced Phase Center Antenna (DPCA) technique in Bistatic Forward-looking SAR (BFSAR) for moving target detection and imaging. In the BFSAR system, the transmitter platform and receiver platform are fixed with two antennas along the direction parallel to the flight track, respectively. It is shown that, using the Dual-Channel DPCA technique in BFSAR, not only...
For high-quality synthetic aperture radar (SAR) processing, Doppler centroid estimation is an essential procedure. An incorrect Doppler centroid would cause a loss of SNR, an increase in the azimuth ambiguity level, a shift in the location of the target, etc. An improved Radon-transform-based Doppler centroid estimation scheme of bistatic forward-looking SAR is proposed in this letter. First, this...
For high quality synthetic aperture radar (SAR) processing, Doppler centroid estimation is an essential procedure. According to the range migration characteristic of bistatic forward-looking SAR, an adaptive iterative scheme of Doppler centroid estimation is proposed in this paper. This scheme utilizes the fact that, in the range compressed and azimuth time domain, the range migration slope of point...
Based on the analysis of the range migration characteristic of bistatic forward-looking SAR, a geometry-based Doppler ambiguity resolver is proposed in this paper. This method estimates the Doppler centroid first using edge detection and least square fitting techniques. Combined with the baseband Doppler centroid estimation method, it can more rapidly resolve the Doppler ambiguity number. Besides,...
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