Title :
Coherent spatial filtering for SAR detection of stationary targets
Author :
Jao, Jen King ; Lee, Check F. ; Ayasli, Serpil
Author_Institution :
Lincoln Lab., MIT, Lexington, MA, USA
fDate :
4/1/1999 12:00:00 AM
Abstract :
Analysis of UHF synthetic aperture radar (SAR) images has revealed a spatially correlated phase structure over a resolved target such as a long wire or a large truck. This phase variation, approximated by a simple, range-dependent factor 4πr/λ, results in a line-shaped image spatial spectrum. Such image phase and spectral features can be exploited by coherent spatial filtering to improve target-to-clutter ratios of large targets and stationary target detectability in a strong clutter environment
Keywords :
airborne radar; buried object detection; filtering theory; image enhancement; radar clutter; radar detection; radar imaging; radar resolution; radar target recognition; search radar; synthetic aperture radar; 2D FFT; SAR detection; UHF SAR images; airborne radar; buried object detection; coherent spatial filtering; foliage penetration; ground penetration; image enhancement; large truck target; line-shaped image spatial spectrum; linear image phase model; long wire target; obscured targets; range-dependent factor; spatially correlated phase structure; stationary targets; strong clutter environment; target-to-clutter ratios; thresholding; Azimuth; Filtering; Frequency; Image resolution; Object detection; Phase detection; Radar detection; Signal resolution; Synthetic aperture radar; Wire;
Journal_Title :
Aerospace and Electronic Systems, IEEE Transactions on
