DocumentCode :
1024953
Title :
Robust adaptive beamforming for HF surface wave over-the-horizon radar
Author :
Fabrizio, Giuseppe A. ; Gershman, Alex B. ; Turley, Mike D.
Author_Institution :
Radar Signal Process. Group, Defence Sci. & Technol. Organ., Edinburgh, SA, Australia
Volume :
40
Issue :
2
fYear :
2004
fDate :
4/1/2004 12:00:00 AM
Firstpage :
510
Lastpage :
525
Abstract :
Adaptive beamforming is used to enhance the detection of target echoes received by high frequency (HF) surface wave (HFSW) over-the-horizon (OTH) radars in the presence of spatially structured interference. External interference from natural and man-made sources typically masks the entire range-Doppler search space and is characterized by a spatial covariance matrix that is time-varying or nonstationary over the coherent processing interval (CPI). Adaptive beamformers that update the spatial filtering weight vector within the CPI are likely to suppress such interference most effectively, but the intra-CPI antenna pattern fluctuations result in temporal decorrelation of the clutter which severely degrades subclutter visibility after Doppler processing. A robust adaptive beamformer that effectively suppresses spatially nonstationary interference without degrading subclutter visibility is proposed here. The proposed algorithm is computationally efficient and suitable for practical implementation. Its operational performance is evaluated using experimental data recorded by the Iluka HFSW OTH radar, located near Darwin in far north Australia.
Keywords :
array signal processing; covariance matrices; interference suppression; radar clutter; radar detection; radar interference; radar signal processing; radar tracking; target tracking; Australia; Doppler processing; HF surface wave; Iluka HFSW OTH radar; OTH radars; adaptive beamformers; clutter temporal decorrelation; coherent processing interval; external interference; interference suppression; intra-CPI antenna pattern fluctuations; man-made sources; natural sources; over-the-horizon; range-Doppler search space; robust adaptive beamforming; spatial covariance matrix; spatial filtering weight vector; spatially nonstationary interference; spatially structured interference; subclutter visibility degradation; target echoes detection; Array signal processing; Covariance matrix; Degradation; Echo interference; Frequency; Hafnium; Interference suppression; Radar detection; Robustness; Surface waves;
fLanguage :
English
Journal_Title :
Aerospace and Electronic Systems, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9251
Type :
jour
DOI :
10.1109/TAES.2004.1310001
Filename :
1310001
Link To Document :
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