Determination of absolute interferometric phase using the beam-amplitude ratio technique

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Determination of the absolute phase difference (i.e., not modulo 2{pi}) is a key problem in interferometric synthetic aperture radar (IFSAR) for topographic mapping. One way of solving this problem requires use of a technique different from the basic interferometry to resolve a `coarse` angle measurement that lies within the IFSAR ambiguity angle. The method investigated in this paper involves taking advantage of the difference in the amplitude ratio versus elevation angle that occurs when the elevation beams of the two IFSAR antennas are pointed in slightly different directions. The performance of the technique is a function of the angular separation ... continued below

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5 p.

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Bickel, D.L. & Hensley, W.H. March 1, 1996.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

Determination of the absolute phase difference (i.e., not modulo 2{pi}) is a key problem in interferometric synthetic aperture radar (IFSAR) for topographic mapping. One way of solving this problem requires use of a technique different from the basic interferometry to resolve a `coarse` angle measurement that lies within the IFSAR ambiguity angle. The method investigated in this paper involves taking advantage of the difference in the amplitude ratio versus elevation angle that occurs when the elevation beams of the two IFSAR antennas are pointed in slightly different directions. The performance of the technique is a function of the angular separation of the two beams, the elevation beamwidth, and the symmetry of the two beam-amplitude patterns. The performance required of the technique is set by the ambiguity angle of the interferometer. This paper presents an analysis of the beam-amplitude ratio technique and shows experimental results.

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5 p.

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OSTI as DE96006993

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  • Institute of Electrical and Electronic Engineers (IEEE) international geoscience and remote sensing symposium, Lincoln, NE (United States), 28-31 May 1996

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  • Other: DE96006993
  • Report No.: SAND--95-2705C
  • Report No.: CONF-960504--3
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 228464
  • Archival Resource Key: ark:/67531/metadc671156

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  • March 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • April 13, 2016, 1:23 p.m.

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Bickel, D.L. & Hensley, W.H. Determination of absolute interferometric phase using the beam-amplitude ratio technique, article, March 1, 1996; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc671156/: accessed November 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.