The high spatial resolution capabilities of microwave synthetic thinned array radiometry (STAR) become limited at oblique viewing angles by a phenomenon known as fringe washing. To alleviate this problem, we have developed a band division correlation (BDC) technique that can be implemented onto the digital back end of STAR receivers. BDC reduces the associated bandwidth in each correlator so that signal coherence is extended for large baselines in the array. In this paper, analytical and numerical solutions are presented for the point spread function of a hypothetical 27 meter L-band STAR sensor. The results show that with 4 subband channels, the BDC method improves swath edge resolution from 17.0 to 10.2 km and reduces correlation loss from 2.5 to 0.2 dB.
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