Summary
International Symposium on Antennas and Propagation
2010
Session Number:3TA2
Session:
Number:3TA2-1
Discrete Interference Suppression in Non-homogeneous Clutter Using D3-STMB Hybrid STAP Algorithm
Xiaopeng Yang, Yongxu Liu, Teng Long,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
Space-Time Adaptive Processing (STAP) [1] is a most commonly used signal processing technique for target detection in radar systems, which can effectively suppress the strong clutter and detect the targets from a moving platform. However, the fully adaptive STAP algorithm is very difficult to be implemented for the practical system because of the huge computations and too many samples required for the covariance matrix estimation [2]. The Joint-Domain Localized (JDL) [5] and ΣΔ-STAP [6] algorithms have been proposed as the suboptimal STAP algorithms, which have the small system degrees of freedom (DoFs) and can reduce the computations and sample requirement dramatically. However, those existing STAP algorithms can not correctly detect the targets in the primary range cell for the non-homogeneous clutter environment, specifically when there is a discrete interference [3], because the information of the discrete interference is not contained in the training samples of those algorithms. In order to solve this problem, a nonstatistical direct data domain (D3) method has been proposed to suppress the discrete interference in the primary range cell [7]. However, the performance of the D3 method in suppressing the correlated clutter is inferior to the statistical STAP algorithms [4]. Consequently, the hybrid algorithm of the D3 method and the statistical JDL algorithm has been proposed to remove the discrete interferences in non-homogeneous clutter [3, 9]. However, if there is some array element error in the system, the Localized Processing Region (LPR) in JDL algorithm should be expanded in the spatial domain so that the computations of the D3-JDL hybrid method will be increased significantly. It has been well known that the space-time multiple-beam (STMB) algorithm [8] is robust to array element error and the computations and the sample requirement of which are much smaller than the JDL algorithm. Therefore, a new hybrid method of the D3 method and the STMB algorithm is proposed to suppress the discrete interference in non-homogeneous clutter environment in this paper. This paper is organized as follows. The fundamentals of STAP algorithm are introduced in Section 2. The new hybrid D3-STMB algorithm is presented in Section 3 and the simulation results are given in Section 4. The conclusion is summarized in Section 5.