2-D DOA estimation in case of unknown mutual coupling for multipath signals


Filik T., TUNCER T. E.

MULTIDIMENSIONAL SYSTEMS AND SIGNAL PROCESSING, vol.27, no.1, pp.69-86, 2016 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 27 Issue: 1
  • Publication Date: 2016
  • Doi Number: 10.1007/s11045-014-0290-7
  • Journal Name: MULTIDIMENSIONAL SYSTEMS AND SIGNAL PROCESSING
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.69-86
  • Keywords: Antenna array, 2-D direction-of-arrival estimation, Mutual coupling, Multipath, Parallel uniform linear array, OF-ARRIVAL ESTIMATION, UNIFORM CIRCULAR ARRAYS, ANGLE ESTIMATION, DIRECTION
  • Middle East Technical University Affiliated: Yes

Abstract

In this paper, two dimensional (2-D) direction-of-arrival (DOA) estimation problem in case of unknown mutual coupling and multipath signals is investigated for antenna arrays. A new technique is proposed which uses a special array structure consisting of parallel uniform linear array (PULA). PULA structure is complemented with auxiliary antennas in order to have a structured mutual coupling matrix (MCM). MCM has a symmetric banded Toeplitz structure which allows the application of the ESPRIT algorithm for 2-D paired DOA estimation. The advantage of the PULA structure is exploited by dividing it into overlapping linear sub-arrays (triplets) and spatial smoothing is employed to mitigate multipath signals. Closed form expressions are presented for search-free, paired and unambiguous 2-D DOA estimation. Two algorithms PULA-1 and PULA-2 are proposed to effectively solve the problem. Several simulations are done and the accuracy of the proposed solution is shown.