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

Volume

35

Issue

2

fYear

1999

fDate

4/1/1999 12:00:00 AM

Firstpage

614

Lastpage

626

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;

fLanguage

English

Journal_Title

Aerospace and Electronic Systems, IEEE Transactions on

Publisher

ieee

ISSN

0018-9251

Type

jour

DOI

10.1109/7.766942

Filename

766942