Adaptive matched filter spatial detection performance on standard imagery from a wideband VHF/UHF SAR
- Science Applications International Corp., San Diego, CA (United States)
The adaptive matched filter was implemented as a spatial detector for amplitude-only or complex images, and applied to an image formed by standard narrow band means from a wide angle, wideband radar. Direct performance comparisons were made between different implementations and various matched and mismatched cases by using a novel approach to generate ROC curves parametrically. For perfectly matched cases, performance using imaged targets was found to be significantly lower than potential performance of artificial targets whose features differed from the background. Incremental gain due to whitening the background was also found to be small, indicating little background spatial correlation. It is conjectured that the relatively featureless behavior in both targets and background is due to the image formation process, since this technique averages together all wide angle, wideband information. For mismatched cases where the signature was unknown, the amplitude detector losses were approximately equal to whatever gain over noncoherent integration that matching provided. However, the complex detector was generally very sensitive to unknown information, especially phase, and produced much larger losses. Whitening under these mismatched conditions produced further losses. Detector choice thus depends primarily on how reproducible target signatures are, especially if phase is used, and the subsequent number of stored signatures necessary to account for various imaging aspect angles.
- OSTI ID:
- 207942
- Report Number(s):
- CONF-940449-; ISBN 0-8194-1521-9; TRN: IM9616%%270
- Resource Relation:
- Conference: Society of Photo-Optical Instrumentation Engineers conference on intelligent information systems, Orlando, FL (United States), 4-8 Apr 1994; Other Information: PBD: 1994; Related Information: Is Part Of Aerial surveillance sensing including obscured and underground object detection; Cindrich, E.; Del Grande, N.K.; Gowrinathan, S.; Johnson, P.B.; Shanley, J.F. [eds.]; PB: 443 p.; Proceedings/SPIE, Volume 2217
- Country of Publication:
- United States
- Language:
- English
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