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OTHR Impulsive Interference Suppression in Strong Clutter Background

Tao LIU, Yu GONG, Yaohuan GONG

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Summary :

External interferences can severely degrade the performance of an Over-the-horizon radar (OTHR), so suppression of external interferences in strong clutter environment is the prerequisite for the target detection. The traditional suppression solutions usually began with clutter suppression in either time or frequency domain, followed by the interference detection and suppression. Based on this traditional solution, this paper proposes a method characterized by joint clutter suppression and interference detection: by analyzing eigenvalues in a short-time moving window centered at different time position, clutter is suppressed by discarding the maximum three eigenvalues at every time position and meanwhile detection is achieved by analyzing the remained eigenvalues at different position. Then, restoration is achieved by forward-backward linear prediction using interference-free data surrounding the interference position. In the numeric computation, the eigenvalue decomposition (EVD) is replaced by singular values decomposition (SVD) based on the equivalence of these two processing. Data processing and experimental results show its efficiency of noise floor falling down about 10-20 dB.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E92-A No.11 pp.2866-2873
Publication Date
2009/11/01
Publicized
Online ISSN
1745-1337
DOI
10.1587/transfun.E92.A.2866
Type of Manuscript
PAPER
Category
Digital Signal Processing

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