tailieunhanh - Báo cáo hóa học: " A New Algorithm for Joint Range-DOA-Frequency Estimation of Near-Field Sources"

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: A New Algorithm for Joint Range-DOA-Frequency Estimation of Near-Field Sources | EURASIP Journal on Applied Signal Processing 2004 3 386-392 2004 Hindawi Publishing Corporation A New Algorithm for Joint Range-DOA-Frequency Estimation of Near-Field Sources Jian-Feng Chen Key Lab for Radar Signal Processing Xidian University Xi an 710071 China Email strake2003@ Xiao-Long Zhu Key Lab for Radar Signal Processing Xidian University Xi an 710071 China Department of Automation Tsinghua University Beijing 100084 China Email xlzhujdau@ Xian-Da Zhang Department of Automation Tsinghua University Beijing 100084 China Email zxd-dau@ Received 20 December 2002 Revised 29 August 2003 Recommended for Publication by Zhi Ding This paper studies the joint estimation problem of ranges DOAs and frequencies of near-field narrowband sources and proposes a new computationally efficient algorithm which employs a symmetric uniform linear array uses eigenvalues together with the corresponding eigenvectors of two properly designed matrices to estimate signal parameters and does not require searching for spectral peak or pairing among parameters. In addition the proposed algorithm can be applied in arbitrary Gaussian noise environment since it is based on the fourth-order cumulants which is verified by extensive computer simulations. Keywords and phrases array signal processing DOA estimate range estimate frequency estimate fourth-order cumulant. 1. INTRODUCTION In array signal processing there exist many methods to estimate the directions of arrival DOAs of far-field sources impinging on an array of sensors 1 such as MUSIC ESPRIT and so forth. Most of these methods make an assumption that sources locate relatively far from the array and thus the wavefronts from the sources can be regarded as plane waves. Based on this assumption each source location can be characterized by a single DOA 1 . When the source is close to the array namely in the near-field case however this assumption is no longer valid. The near-field sources