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Volume 30 Issue 4
Dec.  2010
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Liu Cong-Feng, Liao Gui-Sheng. Improving the STAP Performance via Diagonal Loading[J]. Journal of Electronics & Information Technology, 2008, 30(4): 906-910. doi: 10.3724/SP.J.1146.2007.00424
Citation: Liu Cong-Feng, Liao Gui-Sheng. Improving the STAP Performance via Diagonal Loading[J]. Journal of Electronics & Information Technology, 2008, 30(4): 906-910. doi: 10.3724/SP.J.1146.2007.00424

Improving the STAP Performance via Diagonal Loading

doi: 10.3724/SP.J.1146.2007.00424 cstr: 32379.14.SP.J.1146.2007.00424
  • Received Date: 2007-03-26
  • Rev Recd Date: 2008-01-31
  • Publish Date: 2008-04-19
  • Space-Time Adaptive Processing (STAP) is a key technology for moving target detection, but nonhomogeneity will cause the covariance matrix estimation error, which substantially results in the STAP performance degradation. Diagonal loading is used as a means to improve the robustness of the spatial filter against mismatches in both the desired spatial signature and the spatial correlation matrix. In this paper, we consider the diagonal loading is applied to the case of covariance matrix mismatch (statistical mismatch) for STAP, i.e. when there is a mismatch between the actual covariance matrix of interest and the presumed one. The selecting method of the loading level is given, and the particular performance analysis indicates that the rational diagonal loading can improve the detection probability and the output signal-to-noise ratio. Numerical simulations attest the validity of the analysis.
  • loading
  • Ward J. Space-time adaptive processing for airborne radar.Proc. of IEEE Int. Conf. on Acoustics, Speech, and SignalProcessing, Detroit, MI, USA, 1995: 2809-2812.[2]Klemm R. Space-Time Adaptive Processing. London,England, IEE, 1999, Chapter2.[3]Mestre X and Lagunas M . Finite sample size effect onminimum variance beamformers optimum diagonal loadingfactor for large arrays[J].IEEE Trans. on Signal Processing.2006, 54(1):69-82[4]Carlson B D. Covariance matrix estimation errors anddiagonal loading in adaptive arrays[J].IEEE Trans. onAerospace and Electronic Systems.1988, 24(4):397-401[5]Trees H V. Optimum Array Processing. John Wiley, NewYork, USA, 2003, Chapter4.Kogon S. Eigenvectors, diagonal loading and white noise gainconstraints for robust adaptive beamforming. Proc. 37thAsilomar Conf. on Signals, Systems and Computers, PacificGrove, CA, USA, 9-12 November, 2003: 1853-1857.[6]Vincent F and Besson O. Steering vector errors and diagonalloading[J].IEE Proc.-Radar Sonar Navig.2004, 151(6):337-343[7]Cox H, Zeskind R M, and Owen M M. Robust adaptivebeamforming. IEEE Trans. on Acoust., Speech, SignalProcessing, 1987, ASSP-35(10): 1365-1376.
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