High resolution radar imaging
Abstract
The goal of this project is to formulate and investigate new approaches for forming images of radar targets from spotlightmode, delaydoppler measurements. These measurements could be acquired with a highresolution radarimaging system operating with an opticalor radiofrequency carrier. Two approaches are under study. The first is motivated by an imagereconstruction algorithm used in radionuclide imaging called the confidenceweighted algorithm; here, we will refer to this approach as the chirprate modulation approach. The second approach is based on more fundamental principles which starts with a mathematical model that accurately describes the physics of an imaging radarsystem and then uses statisticalestimation theory with this model to derive processing algorithms; we will refer to this as the estimationtheory approach. Progress during this reporting period has been made on: (1) extending the estimationtheory approach to include a constraint on input signaltonoise ratio; (2) extending the estimationtheory approach to include a sieve constraint for stabilizing image estimates, (3) extending the estimationtheory approach to include a specular or glint component in the radarecho data; (4) analyzing the performance of the estimationtheory approach through computer simulations; and (5) modifying the chirprate modulation approach through the introduction of the WignerVille distribution. A patent was awarded associated with the chirprate modulation approach.
 Publication:

Semiannual Progress Report
 Pub Date:
 November 1988
 Bibcode:
 1988wusl.reptR....S
 Keywords:

 Doppler Radar;
 High Resolution;
 Image Reconstruction;
 Imaging Techniques;
 Radar Imagery;
 Radar Targets;
 Signal To Noise Ratios;
 Algorithms;
 Carrier Frequencies;
 Computerized Simulation;
 Glint;
 Mathematical Models;
 Patents;
 Radioactive Isotopes;
 Specular Reflection;
 Viscosity;
 Communications and Radar