Title :
A technique for reducing fringe washing effects in L-band aperture synthesis radiometry
Author :
Fischman, Mark A. ; England, A.W.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Michigan Univ., Ann Arbor, MI, USA
Abstract :
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
Keywords :
UHF antennas; coherence; correlation methods; geophysical equipment; geophysical signal processing; microwave antenna arrays; radiometers; receiving antennas; remote sensing; satellite antennas; 1.41 GHz; 27 m; BDC technique; L-band aperture synthesis radiometry; STAR; STAR receiver; band division correlation; bandwidth; correlation loss; fringe washing effects; high spatial resolution capabilities; microwave synthetic thinned array radiometry; oblique viewing angles; point spread function; signal coherence; swath edge resolution; Apertures; Bandwidth; Correlators; Earth; Instruments; L-band; Marine technology; Microwave radiometry; Space technology; Spatial resolution;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 2000. Proceedings. IGARSS 2000. IEEE 2000 International
Conference_Location :
Honolulu, HI
Print_ISBN :
0-7803-6359-0
DOI :
10.1109/IGARSS.2000.860367
