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Title: Ionospheric effects on synthetic aperture radar at VHF

Abstract

Synthetic aperture radars (SAR) operated from airplanes have been used at VHF because of their enhanced foliage and ground penetration compared to radars operated at UHF. A satellite-borne VHF SAR would have considerable utility but in order to operate with high resolution it would have to use both a large relative bandwidth and a large aperture. The presence of the ionosphere in the propagation path of the radar will cause a deterioration of the imaging because of dispersion over the bandwidth and group path changes in the imaged area over the collection aperture. In this paper we present calculations of the effects of a deterministic ionosphere on SAR imaging for a radar operated with a 100 MHz bandwidth centered at 250 MHz and over an angular aperture of 23{degrees}. The ionosphere induces a point spread function with an approximate half-width of 150 m in the slant-range direction and of 25 m in the cross-range direction compared to the nominal resolution of 1.5 m in both directions.

Authors:
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
460790
Report Number(s):
LA-UR-96-2985; CONF-970579-1
ON: DE96014808
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: IEEE National radar conference, Syracuse, NY (United States), 13-15 May 1997; Other Information: PBD: [1997]
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; 54 ENVIRONMENTAL SCIENCES; 45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE; RADAR; SPATIAL RESOLUTION; AERIAL SURVEYING; IMAGE PROCESSING; WAVE PROPAGATION; IONOSPHERE; MHZ RANGE 100-1000; MATHEMATICAL MODELS; SATELLITES

Citation Formats

Fitzgerald, T J. Ionospheric effects on synthetic aperture radar at VHF. United States: N. p., 1997. Web.
Fitzgerald, T J. Ionospheric effects on synthetic aperture radar at VHF. United States.
Fitzgerald, T J. 1997. "Ionospheric effects on synthetic aperture radar at VHF". United States. https://www.osti.gov/servlets/purl/460790.
@article{osti_460790,
title = {Ionospheric effects on synthetic aperture radar at VHF},
author = {Fitzgerald, T J},
abstractNote = {Synthetic aperture radars (SAR) operated from airplanes have been used at VHF because of their enhanced foliage and ground penetration compared to radars operated at UHF. A satellite-borne VHF SAR would have considerable utility but in order to operate with high resolution it would have to use both a large relative bandwidth and a large aperture. The presence of the ionosphere in the propagation path of the radar will cause a deterioration of the imaging because of dispersion over the bandwidth and group path changes in the imaged area over the collection aperture. In this paper we present calculations of the effects of a deterministic ionosphere on SAR imaging for a radar operated with a 100 MHz bandwidth centered at 250 MHz and over an angular aperture of 23{degrees}. The ionosphere induces a point spread function with an approximate half-width of 150 m in the slant-range direction and of 25 m in the cross-range direction compared to the nominal resolution of 1.5 m in both directions.},
doi = {},
url = {https://www.osti.gov/biblio/460790}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {2}
}

Conference:
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