Table of Contents
International Scholarly Research Notices
Volume 2014 (2014), Article ID 937139, 6 pages
http://dx.doi.org/10.1155/2014/937139
Research Article

Joint Estimation of Time-Frequency Signature and DOA Based on STFD for Multicomponent Chirp Signals

Research Institute of Information Countermeasure, Xidian University, Xi’an, Shaanxi 710071, China

Received 21 June 2014; Revised 31 August 2014; Accepted 1 September 2014; Published 9 November 2014

Academic Editor: Yong Xiang

Copyright © 2014 Ziyue Zhao and Congfeng 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.

Abstract

In the study of the joint estimation of time-frequency signature and direction of arrival (DOA) for multicomponent chirp signals, an estimation method based on spatial time-frequency distributions (STFDs) is proposed in this paper. Firstly, array signal model for multicomponent chirp signals is presented and then array processing is applied in time-frequency analysis to mitigate cross-terms. According to the results of the array processing, Hough transform is performed and the estimation of time-frequency signature is obtained. Subsequently, subspace method for DOA estimation based on STFD matrix is achieved. Simulation results demonstrate the validity of the proposed method.