L_1$-Regularized STAP Algorithms With a Generalized Sidelobe Canceler Architecture for Airborne Radar

In this paper, we propose novel L 1 -regularized space-time adaptive processing (STAP) algorithms with a generalized sidelobe canceler architecture for airborne radar applications. The proposed methods suppose that a number of samples at the output of the blocking process are not needed for sidelobe...

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Vydáno v:IEEE transactions on signal processing Ročník 60; číslo 2; s. 674 - 686
Hlavní autoři: Yang, Zhaocheng, de Lamare, Rodrigo C., Li, Xiang
Médium: Journal Article
Jazyk:angličtina
Vydáno: 01.02.2012
Témata:
Adaptive algorithms
Airborne radar
Algorithms
Architecture
Complexity
Mathematical analysis
Sidelobes
Vectors (mathematics)
ISSN:1053-587X, 1941-0476
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Shrnutí:In this paper, we propose novel L 1 -regularized space-time adaptive processing (STAP) algorithms with a generalized sidelobe canceler architecture for airborne radar applications. The proposed methods suppose that a number of samples at the output of the blocking process are not needed for sidelobe canceling, which leads to the sparsity of the STAP filter weight vector. The core idea is to impose a sparse regularization ( L 1 -norm type) to the minimum variance criterion. By solving this optimization problem, an L 1 -regularized recursive least squares ( L 1 -based RLS) adaptive algorithm is developed. We also discuss the SINR steady-state performance and the penalty parameter setting of the proposed algorithm. To adaptively set the penalty parameter, two switched schemes are proposed for L 1 -based RLS algorithms. The computational complexity analysis shows that the proposed algorithms have the same complexity level as the conventional RLS algorithm ( O ( ( NM ) 2 ) ) , where NM is the filter weight vector length), but a significantly lower complexity level than the loaded sample covariance matrix inversion algorithm ( O ( ( NM ) 3 ) ) and the compressive sensing STAP algorithm ( O ( ( N sN d ) 3 ) , where N sN d Unknown character NM is the angle-Doppler plane size). The simulation results show that the proposed STAP algorithms converge rapidly and provide a SINR improvement using a small number of snapshots.
Bibliografie:ObjectType-Article-2
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ISSN:1053-587X
1941-0476
DOI:10.1109/TSP.2011.2172435