tailieunhanh - Báo cáo hóa học: "Research Article Robust and Computationally Efficient Signal-Dependent Method for Joint DOA and Frequency Estimation"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Robust and Computationally Efficient Signal-Dependent Method for Joint DOA and Frequency Estimation | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 134853 16 pages doi 2008 134853 Research Article Robust and Computationally Efficient Signal-Dependent Method for Joint DOA and Frequency Estimation Ting Shu and Xingzhao Liu Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China Correspondence should be addressed to Ting Shu tingshu@ Received 17 September 2007 Revised 29 January 2008 Accepted 12 April 2008 Recommended by Fulvio Gini The problem of joint direction of arrival DOA and frequency estimation is considered in this paper. A new method is proposed based on the signal-dependent multistage wiener filter MWF . Compared with the classical subspace-based joint DOA and frequency estimators the proposed method has two major advantages 1 it provides a robust performance in the presence of colored noise 2 it does not involve the estimation of covariance matrix and its eigendecomposition and thus yields much lower computational complexity. These advantages can potentially make the proposed method more feasible in practical applications. The conditional Cramer-Rao lower bound CRB on the error variance for joint DOA and frequency estimation is also derived. Both numerical and experimental results are used to demonstrate the performance of the proposed method. Copyright 2008 T. Shu and X. Liu. 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. 1. INTRODUCTION The problem of simultaneously estimating the spatial and temporal frequencies of multiple narrowband plane waves has received considerable attention in the past few decades 1-10 . This problem is crucial in many practical applications such as array processing joint angle and Doppler estimation for space-time adaptive processing STAP airborne radar .