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Journal of Electrical and Computer Engineering
Volume 2010, Article ID 973718, 6 pages
http://dx.doi.org/10.1155/2010/973718
Research Article

A Modified Fast Approximated Power Iteration Subspace Tracking Method for Space-Time Adaptive Processing

1National Laboratory of Radar Signal Processing, Xidian University, Xi'an 710071, China
2Communication and Information Engineering Collage, Xi'an University of Science and Technology, Xi'an 710054, China
3Department of Communication and Information Engineering, Guilin University of Electronic Technology, Guilin 541004, China

Received 3 August 2010; Revised 22 November 2010; Accepted 16 December 2010

Academic Editor: Tamal Bose

Copyright © 2010 Yang Zhiwei et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We propose a subspace-tracking-based space-time adaptive processing technique for airborne radar applications. By applying a modified approximated power iteration subspace tracing algorithm, the principal subspace in which the clutter-plus-interference reside is estimated. Therefore, the moving targets are detected by projecting the data on the minor subspace which is orthogonal to the principal subspace. The proposed approach overcomes the shortcomings of the existing methods and has satisfactory performance. Simulation results confirm that the performance improvement is achieved at very small secondary sample support, a feature that is particularly attractive for applications in heterogeneous environments.