Accession Number : ADD018264

Title :   Measurement of Topography Using Polarimetric Synthetic Aperture Radar (SAR).

Descriptive Note : Patent, Filed 10 Oct 95, patented 3 Sep 96,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Schuler, Dale L ; Lee, Jong-Sen

Report Date : 03 Sep 1996

Pagination or Media Count : 35

Abstract : The polarimetric technique of measuring azimuth direction terrain slopes utilizes a polarimetric synthetic aperture radar (SAR) to provide a direct measure of terrain azimuthal slopes and a derived estimate of terrain elevation. Utilizing this measure of the azimuthal slopes and estimated terrain elevations, a one-dimensional terrain slope map over a wide area may he produced without any prior knowledge of the terrain. Utilizing the method of steepest descent (or gradients) the polarimetric orientation of the peak (maximum) of the signature is determined for each image pixel. The terrain elevations are derived by integrating the slopes in the azimuthal direction and may be further refined so as to obtain absolute, rather than relative, elevation values by independently knowing at least one elevation 'tie-point' along each slope profile being integrated. These orientations are proportional to terrain slope in the azimuthal direction. Processing of all the image pixels allows a complete two-dimensional topography elevation map of the terrain slopes can then be constructed from sets of elevation profiles spaced throughout the range direction.

Descriptors :   *SYNTHETIC APERTURE RADAR, *RADAR MAPPING, *PATENTS, POLARIMETRY, TERRAIN, TOPOGRAPHY, PROFILES, SLOPE, ELEVATION, AZIMUTH, STEEPEST DESCENT METHOD

Subject Categories : Cartography and Aerial Photography
      Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE