Interferometric SAR phase difference calibration: Methods and results

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This paper addresses the steps necessary to determine and maintain the phase calibration of a two-channel interferometric synthetic aperture radar (IFSAR). The method, setup, and accuracy of four different calibration techniques are compared. The most novel technique involves pointing the interferometric baseline at nadir and imaging a lake surface. The other techniques include measuring various flat surfaces in traditional side-looking IFSAR maps, in-flight closed-loop calibration path measurements, and static laboratory measurements. Initial results indicate that, using combinations of these measurements, it is possible to maintain the interferometric phase calibration of Sandia National Laboratories` K{sub U} Band IFSAR to better than ... continued below

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15 p.

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Bickel, D. L. & Hensley, W. H. December 31, 1993.

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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

This paper addresses the steps necessary to determine and maintain the phase calibration of a two-channel interferometric synthetic aperture radar (IFSAR). The method, setup, and accuracy of four different calibration techniques are compared. The most novel technique involves pointing the interferometric baseline at nadir and imaging a lake surface. The other techniques include measuring various flat surfaces in traditional side-looking IFSAR maps, in-flight closed-loop calibration path measurements, and static laboratory measurements. Initial results indicate that, using combinations of these measurements, it is possible to maintain the interferometric phase calibration of Sandia National Laboratories` K{sub U} Band IFSAR to better than 3 degrees. The time variability of various parts of the calibration and requirements for recalibration are also discussed.

Physical Description

15 p.

Notes

OSTI as DE94011027; Paper copy available at OSTI: phone, 865-576-8401, or email, reports@adonis.osti.gov

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  • IGARSS `94: international geoscience and remote sensing symposium,Pasadena, CA (United States),8-12 Aug 1994

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  • Other: DE94011027
  • Report No.: SAND--93-3886C
  • Report No.: CONF-940814--2
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 10147027
  • Archival Resource Key: ark:/67531/metadc1310632

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  • December 31, 1993

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  • Nov. 3, 2018, 11:47 a.m.

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  • Nov. 15, 2018, 2:02 p.m.

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Bickel, D. L. & Hensley, W. H. Interferometric SAR phase difference calibration: Methods and results, article, December 31, 1993; Albuquerque, New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1310632/: accessed March 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.