Accession Number : ADA265647


Title :   ISAR Motion Compensation Using the Burst Derivative Measure as a Focal Quality Indicator


Descriptive Note : Professional paper,


Corporate Author : NAVAL COMMAND CONTROL AND OCEAN SURVEILLANCE CENTER RDT AND E DIV SAN DIEGO CA


Personal Author(s) : Bocker, Richard P ; Jones, Scott A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a265647.pdf


Report Date : Apr 1993


Pagination or Media Count : 3


Abstract : Inverse synthetic aperture radar (ISAR)is an imaging technique that shows great promise in classifying airborne targets in realtime under all weather conditions. The success of classifying targets using ISAR is predicated upon forming highly focused radar images of these targets. Efforts to develop highly focused imaging computer software have been challenging, mainly because the imaging depends on and is affected by the motion of the target. Computationally intensive motion compensation algorithms have been developed to remove the unwanted degrading effects of target motion. Those particular motion compensation algorithms which require the use of a space-domain focal quality indicator, e.g., entropy, to determine image sharpness as processing proceeds pay a severe computational penalty due to the large number of two-dimensional fast Fourier transforms (2D-FFTs) which must be computed. This is due to the fact that the actual processing of ISAR data is primarily done in the spatial frequency domain and not in the space-domain where the final ISAR image is displayed. If a focal quality indicator could be developed to measure image sharpness in the spatial frequency domain, then the computational burden introduced by the numerous 2D-FFTs could be greatly relaxed. This paper describes the use of a new focal quality indicator called the burst derivative measure for determining ISAR image sharpness in the spatial frequency domain. Tests have been performed on simulated as well as actual ISAR data using both the burst derivative measure and the entropy measure.


Descriptors :   *SYNTHETIC APERTURE RADAR , *RADAR IMAGES , *TARGET CLASSIFICATION , *IMAGE MOTION COMPENSATION , TEST AND EVALUATION , COMPUTER PROGRAMS , ALGORITHMS , IMAGE PROCESSING , SHIPS , TARGETS , FAST FOURIER TRANSFORMS , BIOLUMINESCENCE , SHARPNESS , PLANKTON , OCEANOGRAPHY , PERIODIC VARIATIONS , ENTROPY , ALL WEATHER , FREQUENCY DOMAIN , SURFACE WATERS , WEATHER , TWO DIMENSIONAL , AIRBORNE , MOVING TARGETS , PARALLEL PROCESSING , RADAR


Subject Categories : Active & Passive Radar Detection & Equipment


Distribution Statement : APPROVED FOR PUBLIC RELEASE