Accession Number : ADA301434

Title :   Preliminary Analysis of Vertical-Motion Detection for Low-Elevation Targets with Doppler Processing at W-Band,

Corporate Author : NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA

Personal Author(s) : Groves, G. W. ; Conte, J. E. ; Blair, W. D.

PDF Url : ADA301434

Report Date : OCT 1995

Pagination or Media Count : 41

Abstract : The detection of vertical motion of a low-elevation target in multipath by frequency analysis using millimeter waves such as W-band radar is considered. Target vertical motion can be detected if the range rate of the image differs sufficiently from that of the target itself, so that their Doppler shifts allow resolution of the target return from its image. This observed difference in frequency provides additional information on target position and velocity. The favorable circumstances that create the possibility of using this effect to detect vertical target motion are discussed. An optimum interval in the time domain for analysis is developed for the case when the multipath-induced splitting of the Doppler-shifted frequencies is resolvable. A procedure is outlined for determining at each radar dwell (1) whether or not the multipath returns are resolvable, and (2) the appropriate analysis interval for achieving the resolution. A practical signal-processing technique is suggested for achieving the desired spectral resolution. Several examples of target trajectories are presented to illustrate cases where each method succeeds or fails. Conclusions and recommendations for further studies are given. (AN)

Descriptors :   *DOPPLER RADAR, *TARGET DETECTION, MATHEMATICAL MODELS, ALGORITHMS, SIGNAL PROCESSING, COMPUTERIZED SIMULATION, FOURIER TRANSFORMATION, OPTIMIZATION, OCEAN SURFACE, RESOLUTION, SHIP MOTION, MOTION, MOVING TARGETS, KALMAN FILTERING, MILLIMETER WAVES, POWER SPECTRA, RADAR IMAGES, CASE STUDIES, VERTICAL ORIENTATION, POSITION FINDING, RADAR REFLECTIONS, MULTIPATH RADAR, SHIP DEFENSE SYSTEMS, RANGE FINDING, FLIGHT MANEUVERS, FLIGHT PATHS, TARGET POSITION INDICATORS, SLANT RANGE, MULTIPATH TRANSMISSION, DWELL TIME, DOPPLER EFFECT, LOW ELEVATION.

Subject Categories : Active & Passive Radar Detection & Equipment
      Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE