A Numerical Procedure for Recovering True Scattering Coefficients from Measurements with Wide-Beam Antennas
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).
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1991
- Accession Number
- ADA258314
Entities
People
- Qinglin Wang
- Sivaprasad P. Gogineni
Organizations
- University of Kansas