Measurement reduction for mutual coupling calibration in DOA estimation

Aksoy, Taylan
Tuncer, Temel Engin
Mutual coupling is an important source of error in antenna arrays that should be compensated for super resolution direction-of-arrival (DOA) algorithms, such as Multiple Signal Classification (MUSIC) algorithm. A crucial step in array calibration is the determination of the mutual coupling coefficients for the antenna array. In this paper, a system theoretic approach is presented for the mutual coupling characterization of antenna arrays. The comprehension and implementation of this approach is simple leading to further advantages in calibration measurement reduction. In this context, a measurement reduction method for antenna arrays with omni-directional and identical elements is proposed which is based on the symmetry planes in the array geometry. The proposed method significantly decreases the number of measurements during the calibration process. This method is evaluated using different array types whose responses and the mutual coupling characteristics are obtained through numerical electromagnetic simulations. It is shown that a single calibration measurement is sufficient for uniform circular arrays. Certain important and interesting characteristics observed during the experiments are outlined.


Modified neural multiple source tracking algorithm in the presence of mutual coupling
Caylar, Selcuk; Leblebicioğlu, Mehmet Kemal; Dural, Guelbin (2007-06-15)
In smart antenna systems, mutual coupling between elements can significantly degrade the processing algorithms [1]. In this paper mutual coupling effects on Modified Neural Multiple Source Tracking Algorithm (MN-MUST) has been studied. MN-MUST algorithm applied to the Uniform Circular Array (UCA) geometry for the first time. The validity of MN-MUST algorithm in the presence of mutual coupling has been proved for both Uniform Linear Array (ULA) and UCA. Simulation results of MN-MUST algorithm are provided fo...
2-D DOA estimation in case of unknown mutual coupling for multipath signals
Filik, Tansu; Tuncer, Temel Engin (2016-01-01)
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...
Elbir, Ahmet M.; Tuncer, Temel Engin (2015-08-12)
Multipath signals are main source of error for parameter estimation in direction finding applications. In this paper, a new method is proposed for the estimation of direction-of-arrivals (DOA) of a far-field source and localization of its near-field multipath reflections in two steps. Firstly, far-field source DOA is estimated using a calibration technique. In the second step, a near-to-far field transformation is presented in order to eliminate the far-field components of the array data and obtain only nea...
Direction finding with a circularly rotated antenna
Koc, AT; Sen, E; Tanik, Y (2000-06-09)
In this work, a new algorithm for multiple emitter direction finding by using a single antenna moving along a circular trajectory is proposed. The problem is formulated by taking the Doppler frequency shift, caused by the movement of the antenna. into account, and by assuming that the information, hidden in the incoming signals, does not change in the observation duration. The proposed direction finding algorithm is, therefore, based on single snapshot processing and also on the linear prediction method dev...
Aktas, Metin; Tuncer, Temel Engin (2011-09-02)
Antenna array calibration is an important task. In this paper, an online calibration method is proposed for antenna arrays where the antennas have unknown gain/phase mismatch and mutual coupling. The mutual coupling matrix is unstructured and the array is randomly deployed on a plane. Two reference sensors are assumed to be perfectly calibrated. The proposed technique uses higher order statistics (HOS) and the reference sensors to estimate the direction-of-arrivals (DOA) of multiple signals. The gain/phase ...
Citation Formats
T. Aksoy and T. E. Tuncer, “Measurement reduction for mutual coupling calibration in DOA estimation,” RADIO SCIENCE, pp. 0–0, 2012, Accessed: 00, 2020. [Online]. Available: