Super-Resolution Imagery by Frequency Sweeping.
Abstract
A longstanding problem in radar and electromagnetic scattering measurements is the reconstruction of object shape and detail, i.e. an image, from far field scatter data to be used in object identification and classification. During the period covered by this report we have been able to demonstrate in a feasibility study the first reconstruction of a 3-D image of a perfectly reflecting object from its wave-vector diversity (multifrequency and multiaspect) scatter data making use of a new Weighted Fourier Domain Projection Theorem (WFDPT) and establish a relationship between holography with wavelength diversity and inverse scattering. Coherent wave vector diversity radar techniques are used to access a finite volume of the 3-D Fourier space (also known as reciprocal space or p-space) of the scattering object. The WFDPT permits the use of hybrid (digital/optical) computing that enables the retrieval and display of 3-D image information in parallel slices or cross-sectional outlines. The major attributes of this approach as compared to totally digital computing are its potential for displaying a true 3-D image in real-time. Wave-vector diversity methods appear suitable for the imaging of two classes of practical objects namely non-dispersive perfectly reflecting objects of the type often encountered in radar (and sonar) and semitransparent weakly scattering objects such as certain ultrasound and light scattering objects encountered in biology and medicine.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 15, 1980
- Accession Number
- ADA090838
Entities
People
- Charles Werner
- N. H. Farhat
Organizations
- Moore School of Electrical Engineering