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


Filik T., TUNCER T. E.

MULTIDIMENSIONAL SYSTEMS AND SIGNAL PROCESSING, cilt.27, sa.1, ss.69-86, 2016 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 27 Konu: 1
  • Basım Tarihi: 2016
  • Doi Numarası: 10.1007/s11045-014-0290-7
  • Dergi Adı: MULTIDIMENSIONAL SYSTEMS AND SIGNAL PROCESSING
  • Sayfa Sayıları: ss.69-86

Özet

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.