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Title: Reflectors for SAR performance testing.

Abstract

Synthetic Aperture Radar (SAR) performance testing and estimation is facilitated by observing the system response to known target scene elements. Trihedral corner reflectors and other canonical targets play an important role because their Radar Cross Section (RCS) can be calculated analytically. However, reflector orientation and the proximity of the ground and mounting structures can significantly impact the accuracy and precision with which measurements can be made. These issues are examined in this report.

Authors:
Publication Date:
Research Org.:
Sandia National Laboratories
Sponsoring Org.:
USDOE
OSTI Identifier:
929123
Report Number(s):
SAND2008-0396
TRN: US200814%%4
DOE Contract Number:
AC04-94AL85000
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; REFLECTION; ACCURACY; ORIENTATION; PERFORMANCE TESTING; RADAR; Target recognition.; Synthetic Aperture Radar.; Radar cross sections.

Citation Formats

Doerry, Armin Walter. Reflectors for SAR performance testing.. United States: N. p., 2008. Web. doi:10.2172/929123.
Doerry, Armin Walter. Reflectors for SAR performance testing.. United States. doi:10.2172/929123.
Doerry, Armin Walter. 2008. "Reflectors for SAR performance testing.". United States. doi:10.2172/929123. https://www.osti.gov/servlets/purl/929123.
@article{osti_929123,
title = {Reflectors for SAR performance testing.},
author = {Doerry, Armin Walter},
abstractNote = {Synthetic Aperture Radar (SAR) performance testing and estimation is facilitated by observing the system response to known target scene elements. Trihedral corner reflectors and other canonical targets play an important role because their Radar Cross Section (RCS) can be calculated analytically. However, reflector orientation and the proximity of the ground and mounting structures can significantly impact the accuracy and precision with which measurements can be made. These issues are examined in this report.},
doi = {10.2172/929123},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2008,
month = 1
}

Technical Report:

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  • Synthetic Aperture Radar (SAR) performance testing and estimation is facilitated by observing the system response to known target scene elements. Trihedral corner reflectors and other canonical targets play an important role because their Radar Cross Section (RCS) can be calculated analytically. However, reflector orientation and the proximity of the ground and mounting structures can significantly impact the accuracy and precision with which measurements can be made. These issues are examined in this report.
  • This paper discusses recent efforts to realize GaInAsSb/GaSb TPV cells with an internal back-surface reflector (BSR). The cells are fabricated by wafer bonding the GaInAsSb/GaSb device layers to GaAs substrates with a dielectric/Au reflector, and subsequently removing the GaSb substrate. The internal BSR enhances optical absorption within the device while the dielectric layer provides electrical isolation. This approach is compatible with monolithic integration of series-connected TPV cells and can mitigate the requirements of filters used for front-surface spectral control.
  • The experiments analyzed here are part of a continuing series to determine the merits of using mirrors with shallow solar ponds. On the north sides, these ponds have mirrors which are half as high as the ponds are wide (N-S). The mirrors are adjusted to be particularly effective in the middle of winter. The ponds have foamed insulation underneath; the small ones also have insulation around the edges. Water is contained in vinyl water bags, and one glazing provides a dead air space over the bag. The glazing is corrugated fiberglass, horizontal over the small ponds (A and B), andmore » arched over the 12' N--S dimension of the large ponds (4 and 6). In each case, essentially identical ponds were used, one with a mirror and one without, to provide a controlled comparison. Ponds A and B are each 2' x 10'; ponds 4 and 6 are 12' x 50'. The long dimensions are E-W.« less