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Title: A SAR image-formation algorithm that compensates for the spatially-variant effects of antenna motion

Abstract

A synthetic aperture radar (SAR) obtains azimuth resolution by combining data from a number of points along a specified path. Uncompensated antenna motion that deviates significantly from the desired path produces spatially-variant errors in the output image. The algorithm presented in this paper corrects many of these motion-related errors. In this respect, it is similar to time-domain convolution, but it is more computationally efficient. The algorithm uses overlapped subapertures in a three-step image-formation process: coarse-resolution azimuth processing, fine-resolution range processing, and fine-resolution azimuth processing. Range migration is corrected after the first stage, based on coarse azimuth position. Prior to the final azimuth-compression step, data coordinates, are determined to fine resolution in range and coarse resolution in azimuth. This coordinate information is combined with measured motion data to generate a phase correction that removes spatially-variant errors. The algorithm is well-suited for real-time applications, particularly where large flight-path deviations must be tolerated.

Authors:
;
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10134341
Report Number(s):
SAND-93-2125C; CONF-940449-5
ON: DE94008456; BR: GB0103012; TRN: AHC29408%%29
DOE Contract Number:  
AC04-94AL85000
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]
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; SYNTHETIC-APERTURE RADAR; EVALUATION; IMAGE PROCESSING; ALGORITHMS; REMOTE SENSING; REAL TIME SYSTEMS; 540110; 540210; 540310; BASIC STUDIES

Citation Formats

Burns, B L, and Cordaro, J T. A SAR image-formation algorithm that compensates for the spatially-variant effects of antenna motion. United States: N. p., 1994. Web.
Burns, B L, & Cordaro, J T. A SAR image-formation algorithm that compensates for the spatially-variant effects of antenna motion. United States.
Burns, B L, and Cordaro, J T. Tue . "A SAR image-formation algorithm that compensates for the spatially-variant effects of antenna motion". United States. https://www.osti.gov/servlets/purl/10134341.
@article{osti_10134341,
title = {A SAR image-formation algorithm that compensates for the spatially-variant effects of antenna motion},
author = {Burns, B L and Cordaro, J T},
abstractNote = {A synthetic aperture radar (SAR) obtains azimuth resolution by combining data from a number of points along a specified path. Uncompensated antenna motion that deviates significantly from the desired path produces spatially-variant errors in the output image. The algorithm presented in this paper corrects many of these motion-related errors. In this respect, it is similar to time-domain convolution, but it is more computationally efficient. The algorithm uses overlapped subapertures in a three-step image-formation process: coarse-resolution azimuth processing, fine-resolution range processing, and fine-resolution azimuth processing. Range migration is corrected after the first stage, based on coarse azimuth position. Prior to the final azimuth-compression step, data coordinates, are determined to fine resolution in range and coarse resolution in azimuth. This coordinate information is combined with measured motion data to generate a phase correction that removes spatially-variant errors. The algorithm is well-suited for real-time applications, particularly where large flight-path deviations must be tolerated.},
doi = {},
url = {https://www.osti.gov/biblio/10134341}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {3}
}

Conference:
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