Accession Number : ADA258314
Title : A Numerical Procedure for Recovering True Scattering Coefficients from Measurements with Wide-Beam Antennas
Descriptive Note : Technical rept.
Corporate Author : KANSAS UNIV CENTER FOR RESEARCH INC LAWRENCE RADAR SYSTEMS AND REMOTE SENSING LAB
Personal Author(s) : Wang, Qinglin ; Gogineni, Sivaprasad P
Report Date : Sep 1991
Pagination or Media Count : 35
Abstract : This report presents a numerical procedure for estimating the true scattering coefficient, sigma(sup 0), from measurements made using wide-beam antennas. The use of wide-beam antennas results in an inaccurate estimate of sigma(sup 0) if the narrow-beam approximation is used in the retrieval process for sigma(sup 0). To reduce this error, the authors propose a correction procedure that estimates the error resulting from the narrow-beam approximation and uses the error to obtain a more accurate estimate of sigma(sup 0). An exponential model has been assumed to take into account the variation of sigma(sup 0) with incidence angles, and the model parameters are estimated from measured data. Based on the model and knowledge of the antenna pattern, the procedure calculates the error due to the narrow-beam approximation. The procedure is shown to provide a significant improvement in the estimation of sigma(sup 0) obtained with wide-beam antennas. The procedure also is insensitive to the model assumption of sigma(sup 0).
Descriptors : *MATHEMATICAL MODELS , *MEASUREMENT , *ESTIMATES , *RADAR ANTENNAS , *CORRECTIONS , *COEFFICIENTS , *BACKSCATTERING , MODELS , ANGLE OF INCIDENCE , TARGET DETECTION , NUMERICAL ANALYSIS , VARIATIONS , ERRORS , ELECTROMAGNETIC SCATTERING
Subject Categories : Active & Passive Radar Detection & Equipment
Target Direction, Range and Position Finding
Radiofrequency Wave Propagation
Distribution Statement : APPROVED FOR PUBLIC RELEASE