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Title: Ultra-wideband VHF SAR -- Design and measurements

Abstract

CARABAS, an acronym for ``Coherent All Radio Band Sensing``, is an airborne, horizontal-polarization SAR operating across the frequency band 20--90 MHz, conceived, designed and built by FOA in Sweden. The original motivation for designing such a low frequency system was that a large relative or fractional bandwidth could be achieved at low frequencies. For reasons to be explained, a large fractional bandwidth was considered to be of potential benefit for radar detection in severe clutter environments. A feasibility study of a short wave ultra-wideband radar started at FOA in 1985. Actual construction of the CARABAS system commenced 1987, aircraft integration took place during 1991 and the first radar tests were conducted in early 1992. From the fall of 1992 onwards, field campaigns and evaluation studies have been conducted as a joint effort between FOA and MIT Lincoln Laboratory in the US. This article will focus on experiences concerning foliage penetration with the system. First the authors touch upon the CARABAS system characteristics, outline the arguments behind a large-fractional-bandwidth VHF-band SAR approach to foliage penetration, and finally present some early experimental results. The authors refer to other papers, for a fuller explanation of the system, for more details of image calibrationmore » and for results concerning underground imaging.« less

Authors:
; ; ; ; ;  [1]; ; ;  [2]
  1. National Defense Research Establishment, Linkoeping (Sweden)
  2. Massachusetts Inst. of Technology, Lexington, MA (United States)
Publication Date:
OSTI Identifier:
207932
Report Number(s):
CONF-940449-
ISBN 0-8194-1521-9; TRN: IM9616%%260
Resource Type:
Conference
Resource Relation:
Conference: Society of Photo-Optical Instrumentation Engineers conference on intelligent information systems, Orlando, FL (United States), 4-8 Apr 1994; Other Information: PBD: 1994; Related Information: Is Part Of Aerial surveillance sensing including obscured and underground object detection; Cindrich, E.; Del Grande, N.K.; Gowrinathan, S.; Johnson, P.B.; Shanley, J.F. [eds.]; PB: 443 p.; Proceedings/SPIE, Volume 2217
Country of Publication:
United States
Language:
English
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; SYNTHETIC-APERTURE RADAR; PERFORMANCE TESTING; DESIGN; INTERNATIONAL COOPERATION; MHZ RANGE; RADIOWAVE RADIATION; REMOTE SENSING; DATA; IMAGES; USES

Citation Formats

Hellsten, H, Froelind, P O, Gustavsson, A, Jonsson, T, Larsson, B, Stenstroem, G, Binder, B T, Mirkin, M, and Ayasli, S. Ultra-wideband VHF SAR -- Design and measurements. United States: N. p., 1994. Web.
Hellsten, H, Froelind, P O, Gustavsson, A, Jonsson, T, Larsson, B, Stenstroem, G, Binder, B T, Mirkin, M, & Ayasli, S. Ultra-wideband VHF SAR -- Design and measurements. United States.
Hellsten, H, Froelind, P O, Gustavsson, A, Jonsson, T, Larsson, B, Stenstroem, G, Binder, B T, Mirkin, M, and Ayasli, S. 1994. "Ultra-wideband VHF SAR -- Design and measurements". United States.
@article{osti_207932,
title = {Ultra-wideband VHF SAR -- Design and measurements},
author = {Hellsten, H and Froelind, P O and Gustavsson, A and Jonsson, T and Larsson, B and Stenstroem, G and Binder, B T and Mirkin, M and Ayasli, S},
abstractNote = {CARABAS, an acronym for ``Coherent All Radio Band Sensing``, is an airborne, horizontal-polarization SAR operating across the frequency band 20--90 MHz, conceived, designed and built by FOA in Sweden. The original motivation for designing such a low frequency system was that a large relative or fractional bandwidth could be achieved at low frequencies. For reasons to be explained, a large fractional bandwidth was considered to be of potential benefit for radar detection in severe clutter environments. A feasibility study of a short wave ultra-wideband radar started at FOA in 1985. Actual construction of the CARABAS system commenced 1987, aircraft integration took place during 1991 and the first radar tests were conducted in early 1992. From the fall of 1992 onwards, field campaigns and evaluation studies have been conducted as a joint effort between FOA and MIT Lincoln Laboratory in the US. This article will focus on experiences concerning foliage penetration with the system. First the authors touch upon the CARABAS system characteristics, outline the arguments behind a large-fractional-bandwidth VHF-band SAR approach to foliage penetration, and finally present some early experimental results. The authors refer to other papers, for a fuller explanation of the system, for more details of image calibration and for results concerning underground imaging.},
doi = {},
url = {https://www.osti.gov/biblio/207932}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {12}
}

Conference:
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