Through-Wall Synthetic Aperture Radar (TWSAR) 3D Imaging: Algorithm Design
Abstract
Typical synthetic aperture radar (SAR) images are two-dimensional, providing range and azimuth information, but furnish few details with respect to elevation. One approach to extend SAR to three-dimensional imaging is to replace the single antenna element by an array of antenna elements. The simplest such implementation of this would be a linear array oriented vertically. This report contains two sections, the first outlining data and image processing for a threedimensional application, and the second part details finite beamwidth processing for the time-domain backprojection method. Standard backprojection implicitly assumes infinite beamwidth, whereby the entire target area is illuminated and returns are collected from all points in the imaging grid. This decreases the efficiency of the algorithm by summing over unnecessary grid points. Finite beamwidth processing is designed to be more physically realistic by accounting for the actual antenna pattern. Initial results show that depending on the width of the effective beam, the number of processing loops can be reduced by up to 50%, while still maintaining good image quality in terms of the reconstructed target response (pulse width). Potential improvements in 3D SAR processing are even greater.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 2004
- Accession Number
- ADA436218
Entities
People
- Greg B. Barrie
Organizations
- Defence Research and Development Canada