Accession Number : ADA445205


Title :   Demonstration of Reduced False Alarm Rates using Simulated L-Band Polarimetric SAR Imagery of Concealed Targets


Corporate Author : DEFENCE SCIENCE AND TECHNOLOGY LAB MALVERN (UNITED KINGDOM)


Personal Author(s) : Williams, Mark L ; Harris, Nicola


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a445205.pdf


Report Date : 14 Apr 2005


Pagination or Media Count : 7


Abstract : Coherent scattering calculations have been performed to produce L-Band SAR images of targets below a forest canopy. The calculations, which are fully polarimetric, are described. High clutter levels permit detection of all concealed targets only at the cost of a very high false alarm rate. The simulated imagery is analysed using the entropy-alpha polarimetric decomposition technique. Using alpha and entropy in addition to a co-polar intensity channel, and combining the results of separate CFAR algorithms, the number of false alarms is reduced dramatically. The consequences for applications of polarimetric SAR to concealed target detection and identification are considered.


Descriptors :   *SYNTHETIC APERTURE RADAR , *RADAR IMAGES , *SURFACE TARGETS , *L BAND , *TARGET DETECTION , ALGORITHMS , COHERENT SCATTERING , TREE CANOPY , FALSE ALARMS , ENTROPY , POLARIMETERS


Subject Categories : Active & Passive Radar Detection & Equipment
      Target Direction, Range and Position Finding


Distribution Statement : APPROVED FOR PUBLIC RELEASE