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International Journal of Antennas and Propagation
Volume 2015, Article ID 135753, 10 pages
Research Article

Direction of Arrival Estimation Accuracy Enhancement via Using Displacement Invariance Technique

1College of Electronic and Information Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China
2College of Astronautics, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China
3Faculty of Engineering, Alexandria University, Alexandria 21615, Egypt

Received 22 April 2015; Revised 2 August 2015; Accepted 5 August 2015

Academic Editor: Giuseppe Castaldi

Copyright © 2015 Youssef Fayad 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.


A new algorithm for improving Direction of Arrival Estimation (DOAE) accuracy has been carried out. Two contributions are introduced. First, Doppler frequency shift that resulted from the target movement is estimated using the displacement invariance technique (DIT). Second, the effect of Doppler frequency is modeled and incorporated into ESPRIT algorithm in order to increase the estimation accuracy. It is worth mentioning that the subspace approach has been employed into ESPRIT and DIT methods to reduce the computational complexity and the model’s nonlinearity effect. The DOAE accuracy has been verified by closed-form Cramér-Rao bound (CRB). The simulation results of the proposed algorithm are better than those of the previous estimation techniques leading to the estimator performance enhancement.